improving connectivity, safety, resiliency & sustainability

the construction of a new arterial street joining ellis boulevard and 6^th street aims to enhance overall connectivity within the downtown. the new street introduces two new roundabouts along with additional safety enhancements. the design for converting the traditional intersections into roundabouts was carefully planned to fit within the existing right-of-way and city-owned property. this approach minimized disruptions to current features such as sidewalks, landscaping, and nearby commercial buildings. it also eliminated the need for the city to acquire additional property and maximized the potential for future redevelopment.

roundabouts streamline traffic flow with efficient traffic circulation

the addition of roundabouts decreases travel times, resulting in less time spent in vehicles for drivers and reduced emissions, contributing to a cleaner environment and enhancing safety. research indicates that roundabouts generally offer greater safety than traditional four-way stops or signalized intersections. collaborating with the city, our engineers provided documentation illustrating how roundabout designs could enhance safety, leading to the city being awarded traffic safety improvement program (tsip) funding for the project.

the 1^st avenue rehabilitation project incorporated additional safety enhancements, including reconfigured travel lanes and raised median layouts to bolster traffic safety and regulate access to potential activity hubs. this effort encompassed milling existing pavement, applying an asphalt overlay, installing new pavement markings and signage, reconstructing accessible pedestrian sidewalk ramps, and replacing traffic signal equipment along the corridor.

the 1st avenue w stretch of roadway from cedar river to 6th street and the new connection from 6th street to ellis boulevard are vital arterial corridors within cedar rapids. extending these streets is anticipated to stimulate investment in the neighborhood severely affected by floods in 2008.

a notable surge in investment interest is evident, as plans for the new 1st and 1st development projects have been unveiled and are well underway. this initiative aims to enhance attractions and amenities in the western downtown cedar rapids area. it includes a hotel, residential options, the pickle palace pickleball court, a restaurant, and a big grove brewing establishment.

working together as a team

1st ave & 6th street intersection facing north before & after construction

planners labeled this project as “complex” due to its multifaceted nature, which included several key components: reconstructing 6th street nw and ellis boulevard nw, creating a new corridor between these two streets, constructing new roundabouts in place of traditional intersections, increasing safety measures at railroad crossings, replacing traffic signals at multiple intersections, and implementing enhancements to a ramp on interstate 380. 2022世界杯32强预选赛 for these projects necessitated extensive communication with various stakeholders, including community leaders, the iowa department of transportation (dot), the union pacific railroad (uprr), developers, business owners, church leaders, utility owners, the flood control system design team, and residents and business owners in the project vicinity.

looking ahead, cedar rapids anticipates a promising era of growth and progress in the downtown region driven by the revitalization efforts spurred by this initiative. with a steadfast focus on resilience in overcoming past challenges, the city is poised to address the deficiencies in its infrastructure and cultivate vibrant spaces that promote connectivity and prosperity for all its residents.

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national flood hazard layer of the project area.

to provide access to microsoft’s new data center and open additional area for development in southwest west des moines, city leaders contracted with snyder and associates and our structural engineering subsidiary, 2022足球世界杯小组赛赛程 , to design the roadway extension of grand avenue, west of grand prairie parkway, and across johnson creek. the project also included implementing a conveyance improvements plan along johnson creek to lower flood elevations upstream of raccoon river drive.

much of the land north of raccoon river drive is in the floodplain of the raccoon river, necessitating the johnson creek improvements. when the property is developed within the floodplain, buildings will be elevated one foot above the one percent annual flood chance.  however, flood elevations in johnson creek were higher than those of the raccoon river under certain future conditions, putting developments in the corridor at risk of flood events even though they were raised above river flood events. additionally, restrictions caused by narrow bridges under the iowa interstate railroad and raccoon river drive were improved as part of the project.

multiple bridge projects highlight expansion efforts

custom-designed monuments for the city of west des moines.

our team created a 2d hydraulic model to evaluate the designs of new bridges over johnson creek and obtained floodplain permits for several projects along the creek. we relocated a portion of the creek to allow for the construction of a new overpass of the iowa interstate railroad on grand prairie parkway. we designed two new bridges at raccoon river drive and the newly constructed grand avenue. our team also worked with iowa interstate railroad to size and permit a new bridge over johnson creek at its track location.

the project included 4,800 feet of new roadway along grand avenue and a 204’-long bridge over johnson creek. the bridge was designed with a 10’-wide trail on the north side and a 5’-wide sidewalk on the south side with custom anodized aluminum railings. our team also designed four decorative monuments at each corner of the bridge. these monuments match the design our team created for the city of west des moines to be included at all its creek crossings in the southwest part of the city. all project work is scheduled to wrap up in the spring of 2024.

spearheaded by the snyder and associates team, the grand avenue extension project in west des moines will improve traffic flow in response to the increased demands of this rapidly expanding area of the city. the incorporation of a conveyance improvements plan along johnson creek not only addressed floodplain considerations but also enhanced the overall infrastructure resilience. with the completion of multiple bridge projects, including a new overpass and a 204’-long bridge over johnson creek, the city now boasts 4,800 feet of new roadway, contributing to the city’s ongoing development efforts and ensuring a more efficient and secure transportation network for its residents.

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crews pour a new section of roadway along old dubuque road.

in a strategic move to address safety concerns and bolster regional connectivity, the city of anamosa required a unique transportation solution to address a regional roadway issue. tackling the challenges of a hazardous intersection at us 151 and old dubuque road (odr), the snyder & associates team was brought on board to not only enhance the transportation infrastructure surrounding this intersection but also to stimulate economic development in the area by providing a safer roadway alternative.

at the heart of the project lay a collaborative effort between our team, city leaders, and the department of transportation (dot) to close the dangerous junction at us 151 and old dubuque road. the initial phase involved extending old dubuque road northward, linking it with circle drive to establish an alternative route for motorists. a pivotal feature of the plan was the integration of a roundabout with east and west road legs, offering improved traffic flow and enhanced safety measures.

the next phase of this regional connection work includes an overpass of us 151 off the east leg of the roundabout. while this design is not yet scheduled for completion, earthwork for the approach was developed and constructed to allow for advanced preparation of grade settlement.

challenges & adaptive solutions lead to safer routes

navigating transitions in city administration presented a unique set of challenges for the project team, requiring adaptive coordination efforts to ensure project continuity. with four turnovers in city leadership, maintaining engagement and transparency through regular updates at city council meetings became paramount. additionally, managing construction alongside a contractor and an adjacent land developer demanded meticulous oversight to safeguard the city’s interests.

the extension of old dubuque road bolstered connectivity around the us 151 interchange and provided a safer route for travelers navigating northeast anamosa. the closure of the hazardous intersection encourages all east-west traffic to utilize the grade-separated east 3rd street to cross the highway. furthermore, the project unlocked access to the anamosa commercial park, previously reliant solely on us 151 for ingress and egress. this newfound accessibility amplifies the park’s appeal to businesses, augmenting its viability as a prime commercial hub.

personal milestones for community as project concluded

a ribbon-cutting ceremony commemorated the opening of the new roundabout and roadway.

beyond infrastructure enhancements, the project’s impact resonated deeply within the community. an emotional ribbon-cutting ceremony marked closure for families who had endured losses at the former intersection, underscoring the project’s significance in promoting safety and well-being.

while the completion of the project’s next phase, an overpass of us 151 off the east leg, remains pending, preparatory earthwork sets the stage for seamless integration. collaborative efforts with the iowa dot yielded funding allocations, with surface transportation block grant (stbg) funds earmarked for construction. as anamosa’s landscape undergoes a transformative evolution, the us 151 grade separation and roundabout is a testament to the city’s commitment to safety, connectivity, and sustainable development. the project propels anamosa towards a brighter, more connected future with each milestone.

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raised medians throughout the corridor create a safer environment for all motorists.

in the heart of unincorporated polk county, a bustling two-lane corridor known as us highway 69 (ne 14th street) has long been a critical lifeline connecting des moines with the thriving suburb of ankeny. this vital artery bears a load of up to 11,000 vehicles daily, but as the years roll on, it is anticipated to accommodate a staggering 24,000 cars each day by the year 2050. to meet this growing traffic demand, the snyder & associates team was tasked by the iowa department of transportation (dot) with developing a plan for the reconstruction of a three-mile stretch of us 69, transforming it from a two-lane rural roadway into a modern, four-lane divided urban thoroughfare.

the land that flanks this corridor is a diverse tapestry of commercial enterprises, industrial hubs, and residential neighborhoods. the plan includes six strategically placed signalized intersections, enhancing convenience and safety for commuters navigating this bustling stretch of road. this monumental undertaking, which commenced in 2021, has already achieved remarkable milestones as it wraps up in 2023.

revolutionized roadway reconstruction: static lidar scanning ensured precision and safety

innovation has often paved the way for progress, and the us 69 reconstruction project was no exception. at its core, the project’s success story began with our team’s implementation of cutting-edge surveying techniques that guaranteed precision and prioritized the safety of those who worked on-site.

the highly detailed lidar image ensured the new roadway aligned with the existing pavement.

the project team fully utilized static lidar scanning. by harnessing the power of lasers and advanced sensors, lidar creates a highly detailed, 3d representation of the environment, in this case, the existing roadway pavement of us highway 69. static lidar scanning captured a comprehensive, high-resolution dataset of the roadway, leaving no room for guesswork. this precise information served as the cornerstone for the entire reconstruction project. it also ensured that the new four-lane divided urban roadway aligned flawlessly with the existing pavement, guaranteeing a seamless transition and a road that meets the iowa dot’s quality standards.

safety is paramount in any construction endeavor, and static lidar scanning has transformed safety protocols. traditional surveying methods often necessitate surveyors to physically enter the work zone, exposing them to the risks inherent in high-traffic construction areas. however, static lidar scanning has eliminated this need. surveyors can remain safe from the active construction site while the technology does the heavy lifting. this revolutionary approach not only safeguards the well-being of the surveying team but also contributes to the project’s overall efficiency, as there is less downtime due to safety concerns.

access control evolution: transforming us highway 69 for enhanced traffic flow and safety

few endeavors in the ambitious landscape of roadway reconstruction are as multifaceted and pivotal as enhancing access control along a bustling corridor like us highway 69. at the heart of this reconstruction project was a fundamental objective—to redefine access management. this undertaking encompassed the careful reconfiguration and consolidation of numerous commercial and residential access points, representing a vital step towards achieving the project’s overarching goals of improved traffic flow, enhanced safety, and capacity expansion to accommodate the corridor’s ever-growing demands.

access management, often called the art of controlling entry, exit, and cross traffic along a roadway, is a crucial facet of modern transportation engineering. in the case of the us 69 reconstruction project, the existing corridor consisted of a web of access points that had evolved, contributing to congestion, delays, and safety concerns. businesses and residences along the corridor required convenient access, but the existing layout challenged efficiency and safety.

our project team embarked on a meticulous access point relocation and consolidation process to address these challenges head-on. this multifaceted endeavor involved a comprehensive assessment of the corridor’s existing access points, considering proximity to intersections, traffic volume, and safety implications. commercial entrances, driveways, and residential access points were strategically repositioned to optimize traffic flow and minimize conflict points.

this project exemplifies the delicate balance between accessibility and efficiency that characterizes modern roadway engineering. while the project aimed to optimize traffic flow and enhance safety, it also recognized the importance of maintaining access for businesses and residents. through careful 2022世界杯32强预选赛 and collaboration with stakeholders, the project achieved a harmonious blend of accessibility and efficiency, ensuring that the corridor remains a vital conduit for the community.

leveraging cutting-edge technology

additionally, this project harnessed the full potential of bentley open roads software to create this transformative corridor. this powerful software served as the digital backbone of the project, transcending the boundaries of traditional design and ushering in a new era of precision and efficiency. the software allowed our design team to develop a dynamic blueprint that guided automated machine guidance during grading and paving. moreover, it served as an analytical laboratory, offering a platform for in-depth design analysis, where every component, contour, and dimension could be scrutinized to perfection.

seamless staging: navigating progress smoothly through us 69 reconstruction

finally, a meticulously crafted staging plan was devised to maintain traffic flow throughout construction. this intricate plan ensured commuters could navigate the corridor safely and efficiently during construction, minimizing disruptions to their daily routines.

the us 69 reconstruction project has been more than just a roadway overhaul — it has been a testament to innovation, collaboration, and foresight. as the corridor has evolved into a four-lane urban roadway, it is now poised to meet the ever-growing transportation needs of the ankeny area, laying the foundation for a brighter, more accessible future.

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the new interchange was reconfigured to a diverging diamond interchange (ddi) formation to improve efficiency and safety. working in conjunction with the interchange design group, the iowa dot, and multiple jurisdictions, the team from snyder & associates was chosen to design the critical roadway elements on either side of the interchange to ensure a smooth and safe transition for motorists.

west side roadway improvements

on the west side of the interchange, our group was tasked with developing designs to reconstruct tower terrace road from 1,000 feet west of miller road to the i-380 interchange. this included updating the roadway from a rural section to an urban section with pedestrian accommodations.

staging for the project construction was critical for maintaining access to nearby homeowners and a busy commercial business on the south side of the roadway. our team designed a temporary access road along the south side of the street between miller road and twisters gymnastics to maintain access during construction. on the north side of the roadway, a temporary entrance and gapped paving were used to support access to an impacted homeowner. in addition to coordinating with the numerous utility conflicts in the project area, we devised a plan for temporary drainage during the staged construction to alleviate stormwater concerns.

during design, our team continuously contacted the idot’s consulting engineer for the ddi portion of the project to ensure our design matched the interchange tie-ins. we also prompted numerous design team meetings with the idot to ensure seamless project coordination.

east side roadway upgrades

north center point road traffic transitions into the roundabout at tower terrace road.

to the east of the interchange, constructing a roundabout at the north center point road intersection was a critical infrastructure upgrade to improve efficiency for drivers near the new ddi interchange. this joint project between hiawatha and the iowa dot was also constructed concurrently with the interchange.

the roadway upgrades include a 4-lane section with a sidewalk on the north and a 10-foot-wide trail on the south side just east of the interchange. the roundabout was designed with a single through lane for north and southbound traffic, dedicated eastbound and westbound right turn lanes, and two through lanes for eastbound and westbound traffic. the design and construction allow for the future addition of another northbound and southbound lane without requiring reconstruction or road closures. our team’s design also alleviated environmental concerns relating to the tower terrace mobile home park adjacent to the new section of the roadway.

as with the west side improvements, extensive coordination meetings with the dot’s consulting engineer were initiated to ensure interchange project alignments and profiles matched. we also designed the west and east side improvement projects to be a “mandatory tie” with the i-380 interchange project. this allowed all three projects to be completed under the same contract and timeline, saving the client money through a larger-scoped project that attracted a large pool of contractors.

tower terrace road stands to become an essential commercial corridor that will promote sustainable development and help the surrounding communities become more vibrant. with a considerable piece of this northern connector now open, this long-planned objective may be realized sooner than expected. the snyder & associates team has also been active with other sections of this vital corridor connection. it looks forward to providing services to all agencies and communities involved in bringing this extensive project to a successful conclusion.

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in response to these pressing challenges, the iowa dot joined forces with snyder & associates, a trusted traffic and roadway improvements partner, to evaluate and propose practical solutions. the objective was to enhance the transportation network along the u.s. highway 6 corridor, which stretches westward from the interstate 35/80 service interchange.

interchange justification report leads to diverging diamond interchange recommendation

the snyder & associates team created an interchange justification report (ijr) that was crucial in this process by providing a comprehensive framework for meeting the fhwa’s criteria. given the challenges presented by the developed land and environmentally sensitive areas surrounding the interchange, multiple alternatives were explored. these alternatives ranged from expanding the existing diamond interchange to converting it into a tight diamond, single-point urban, or a diverging diamond interchange (ddi).

the diverging diamond interchange at hickman road and interstate 35/80 will drastically reduce the traffic conflict points.

after careful analysis, the diverging diamond interchange emerged as the preferred option. snyder & associates traffic engineers determined it best aligned with the project’s criteria. the ddi interchange is a type of interchange that can improve safety and traffic flow by eliminating the need for left turns across opposing traffic. in a ddi interchange, traffic briefly crosses over to the opposite side of the road before merging back onto the original side.

“the new ddi interchange will be a major improvement for safety and traffic flow at this busy interchange,” said snyder & associates project manager nathan carhoff. “the ddi design eliminates the need for left turns across opposing traffic, which is a major cause of crashes at interchanges.”

expanding trail accommodations: enhancing accessibility

this project area contains one of the busiest segments of interstate highway in the state of iowa. i-35/80 between douglas and university carries over 125,000 vehicles per day, with projections for traffic to grow to over 185,000 vehicles per day by 2050, creating a dangerous barrier between the communities of clive and urbandale. regionally, hickman road also carries more east-west traffic from one side of the interstate to the other than any other roadway in the metro. currently, hickman road carries approximately 40,000 vehicles per day along this corridor, with projections for traffic to grow to over 60,000 vehicles per day by 2050.

providing a safe barrier between pedestrians and bicyclists is critical for encouraging non-motorized transportation options and allowing for safe recreational opportunities for residents of all abilities. to that end, the construction of several new trail sections is included in the project. the first trail section is a 2,200-foot-long, ten-foot-wide, pcc pedestrian trail connection that will begin on the east side of the lifetime fitness entrance off hickman road. the trail will turn a loop approximately 500 feet to the east to accommodate elevation change. it will move south via a grade-separated underpass tunnel to safely carry pedestrians and bicyclists under the busy hickman road corridor. turning back to the east and south, the trail will run parallel to the southbound i-35/80 entrance ramp and connect with the clive greenbelt trail near walnut creek.

two pedestrian bridges over the interstate onramps will add a multi-modal component to the new interchange.

the next trail section will begin on the north side of hickman road at the grade-separated tunnel entrance. it will continue to the east, crossing the southbound interstate exit ramp via a pedestrian bridge. the trail’s path will pass beneath the interstate using a grade-separated underpass tunnel and continue over the northbound entrance ramp via another pedestrian bridge. ultimately, the trail will extend east, connecting with a local trail and sidewalk network near nw 111th street.

when complete, this new grade-separated connection will bridge a much-needed gap in the area trail network, providing users with undisturbed access to the raccoon river valley trail and the clive greenbelt trail that collectively tie thousands of residential homes and hundreds of area businesses together, along with dozens of parks and recreational areas — all with minimal to no interaction between trail users and the heavy hickman road and interstate 35/80 traffic.

these trail accommodations align with the project’s broader goals of enhancing accessibility and promoting alternative modes of transportation within the community. they are planned for construction concurrently with the interchange upgrades, demonstrating a holistic approach to transportation infrastructure development.

enhanced stormwater management 2022世界杯32强预选赛

the quality of life for users and aquatic life will also be improved by incorporating numerous stormwater management elements to help control and clean up the added runoff associated with the additional pavement areas. most improvements drain to walnut creek located just south of hickman road. this urban stream takes on stormwater runoff from thousands of developed lots within the western suburbs of des moines, so any additional pavements contribute to higher runoff volumes and quicker discharges to the stream. with faster overland flow, many sediments and water contaminants are also carried within those waters, further damaging the streams and affecting the natural habitat for residents, fish, and plant life.

to address these additional runoff concerns, stormwater within the project area will be treated via grass swales with a rock infiltration sub-base installed in the drainageways. these improvements will promote stormwater infiltration into the ground, and gabions installed at strategic locations will slow the water further, encouraging groundwater infiltration and reducing erosion. other areas of the project will be treated using bioretention cells. these cells will be located within the median islands of the interchange.

all stormwater management features are designed based on city requirements for recharge and water quality volume. this infrastructure will eliminate damage to property and the environment by reducing, slowing, and controlling the flow of stormwater runoff. properly managed streams and natural waterways enhance the community’s natural beauty, increasing community pride, and helping make it a place where people want to live, work, and recreate.

moving traffic safety forward: a safer and more efficient corridor

rendering of the new interchange looking to the northwest.

as the project to revamp the i-35/80 & u.s. 6 interchange progresses into the construction phase, it promises safer and more efficient transportation for the communities of the des moines metro area. with careful 2022世界杯32强预选赛 , adherence to fhwa standards, and a commitment to addressing the region’s evolving needs, this transformative initiative is well on its way to becoming a reality. stay tuned for further updates as we witness the continued evolution of this vital transportation corridor.

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before reconstruction, the existing cedar heights drive corridor consisted of a two-lane rural section that was a main thoroughfare for commuters and a primary access route to the john deere facility on the south side of town. this comprehensive project included reconstructing the entire roadway to a three-lane urban section (with a two-way, left-turn lane), adding an extensive storm sewer system, building a trail, and extending the sanitary sewer and water main.

roundabouts smooth out traffic flow, increase safety

beginning at the greenhill road intersection, this project converted the existing signalized intersection to a multi-lane roundabout configuration. the existing t-intersection was converted to a single-lane roundabout at the huntington road intersection. additionally, a truck apron and landscape features were added to the viking road roundabout at the south end of the project zone. the use of roundabouts will drastically improve the traffic flow along the corridor and increase safety.

these improvements significantly impacted the cedar heights drive and greenhill road areas. the cedar heights drive reconstruction south from the intersection with viking road and north past the intersection with greenhill road, along with the construction of the roundabouts, was divided into two segments, beginning with the greenhill road roundabout. this staging effort allowed traffic access at the huntington road intersection while work was performed to the north.

in addition to the roadway reconstruction and widening, this project also saw the construction of a recreational trail running adjacent to the roadway, a new water main, sanitary sewer main, and storm sewer main were included from the east viking road roundabout north and east through the intersection of east greenhill road.

stormwater analysis drives new sewer system

traffic was temporarily rerouted to accommodate the reconstruction efforts.

an extensive stormwater analysis revealed the need for a new storm sewer system to meet sudas standards. one portion of the new roadway included a boulevard section, which limited the pavement area available for stormwater conveyance while maintaining an open lane for travel during runoff events. this area required additional intakes to meet the design requirements. various intake types and pipe materials were reviewed to optimize capture rates and reduce project costs. this required appropriate storm sewer intakes and pipe sizes to minimize the runoff spread on the arterial roadway. the stormwater improvements included dozens of new intakes and thousands of feet of storm sewer.

our team was also instrumental in this project, receiving numerous funding sources, including iowa department of transportation (dot) federal-aid swap funds, traffic safety improvement program (tsip) funds, and multiple local funding sources to implement these improvements.

the cedar heights drive reconstruction project has significantly improved the transportation network in cedar falls. with the expansion of the roadway to a three-lane urban section, the addition of storm sewers, recreational trails, and extensions of water and sewer mains, this project has enhanced the area’s infrastructure for both commuters and residents. roundabouts have greatly improved traffic flow and increased safety along the corridor. this project was successful due to the collaborative efforts of the cedar falls community, our team, and the multiple funding sources that supported the initiative.

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city leaders enlisted the snyder & associates team to develop a design for reconstructing a nearly one-half-mile section of 4^th street sw along with all underground infrastructure. while 2022世界杯32强预选赛 was underway for this significant project, the city also tasked our team with creating plans for reconstructing a one-block section of nearby 10^th street sw, extending from 2^nd avenue sw to w. bremer avenue.

box culvert installation improves area stormwater drainage

the construction crew is in the process of forming and constructing the twin cast-in-place box culvert.

because the corridor is very flat, our team designed a vertical roadway profile to eliminate stormwater drainage issues. additionally, the structural engineers from our subsidiary, 2022足球世界杯小组赛赛程 , designed a massive twin box culvert that extends under the roadway, allowing water from the golf course to flow under 4^th street sw and empties into the dry run creek near 1^st street sw.

our team coordinated with private utilities, the iowa department of natural resources (dnr), the iowa department of transportation (dot), and the 世界杯足球比赛预选赛 to provide information about the project and obtain the necessary permits and approvals. we also coordinated 世界杯足球比赛预选赛 outreach efforts to communicate the goals and construction plans with all area stakeholders. ada-compliant pedestrian accommodations were added throughout the project zone to ensure all areas met the current code.

during construction, our team monitored numerous historical buildings along the 4^th street sw corridor to ensure that vibrations from the heavy machinery did not adversely affect the foundations or structural integrity of the buildings. we also incorporated and maintained a strategic access plan during the project to provide safe ingress and egress for residents and businesses impacted by the construction. this included coordinating traffic detours with the iowa dot and city officials.

10^th street sw improvements replace nearly ninety-year-old infrastructure

while smaller in scale, the reconstruction efforts on 10th street sw from 2^nd avenue sw to w. bremer avenue involved replacing the sanitary sewer main, water main, storm sewer, and roadway. the replaced water and sanitary sewer main was believed to date back to around 1938. a new sidewalk was constructed along the west side of the street to provide safer access for area residents.

the major reconstruction project of the 4^th street sw corridor and the one-block section of 10^th street sw has significantly improved the waverly community’s infrastructure and traffic flow. as city leaders continue to focus on corridor improvements, drivers will continue to benefit from reduced travel times, less pollution, and safer commutes. the snyder & associates team will continue to assist the city in creating a better quality of life for residents.

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the special weathering steel used for the bridge beams does not require painting but instead develops a chestnut-colored patina.

the rapid population growth in ankeny, iowa can in large part be attributed to its proximity to des moines and the easy access to interstate 35. to support new site development on the southeast side of the city, expanding that efficient access was critical. the new iowa department of transportation (dot) driver’s license station, several warehouse retail centers, hotels, and other commercial properties were depending on roadway infrastructure to support the increasing growth and vehicle traffic on the east side of the interstate.

to quickly expand access in the area, a new interchange and bridge spanning the interstate at the corporate woods drive location were viewed as the optimal choice. the aggressive schedule desired by city leaders and iowa department of transportation (dot) officials required important decisions to be made quickly.

the professionals with snyder & associates, along with subsidiary 2022足球世界杯小组赛赛程 , were selected to partner with 世界杯足球比赛预选赛 works engineers from the city of ankeny, polk county, iowa dot staff from district 1, office of design, and office of bridges and structures. a cohesive team effort was an essential basis of collaboration for project 2022世界杯32强预选赛 and sound decision-making.

unique bridge features for corporate woods drive interchange

due to the grading at the interchange site, a significant amount of fill placement was required to achieve the new corporate woods drive roadway configuration. our team’s extensive coordination with the geotechnical engineers helped identify the proper construction procedures and specifications to control the settlement of new roadway fill.

the roadway alignment and geometry were established early in the design process. this allowed the bridge design team to immediately get started creating the plans for the steel plate girder bridge featuring a new aesthetic theme. the steel girder design was optimized for the required span lengths over interstate 35 and to provide proper clearance for interstate traffic below. other unique bridge features include:

• curved mask walls and end posts with elaborate rustication patterns
• curved pier cap terminations
• elegant arched steel frame and mesh panel pedestrian railing with a special coating system
• two-tone color pattern for concrete sealers to highlight rustication recesses
• astm a588 weathering steel, which does not require painting, but instead develops a deep chestnut colored protective patina that contrasts against the lightly colored concrete sealers
• a pedestrian trail cross-over benched into the berm using a special retaining wall below the bridge to allow safe pedestrian passage

an arched steel frame and mesh panel pedestrian railing borders the sidewalk along the north side of the bridge.

the design team recognized that pedestrian access was an important aspect of the area’s long-term needs. a raised sidewalk and concrete separation barrier were incorporated on the north side of the bridge. the west approach grading incorporates a sidewalk with a switchback and benched berm to carry the sidewalk back under the west bridge span. this will connect with a future sidewalk on the south side.

the project received the iowa quality initiative structures award and was recognized as the best steel beam bridge on iowa’s primary road system between 2002 and 2004. the award is sanctioned by the associated general contractors of iowa, the iowa dot, and the federal highway administration (fhwa). with all the necessary expertise under one roof, the snyder & associates/2022足球世界杯小组赛赛程 team is able to quickly bring roadway/bridge projects of this magnitude to completion, on time — and on budget.

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crews perform a pavement patching operation along kiwanis avenue.

when the busy kiwanis avenue corridor in sioux falls began to show signs of deterioration, city leaders turned to the professionals with snyder & associates to determine the best course of action for improving the roadway. the two-mile stretch of roadway between west 12^th street and west 41^st street represents a vital north/south thoroughfare for residents. without timely pavement preservation techniques, the roadway would continue to deteriorate, leading to costly and disruptive reconstruction.

recognizing the potential for using cost-saving pavement rehabilitation techniques, the snyder & associates team performed a pavement analysis on the corridor. we studied the pavement’s structural integrity using concrete coring methods and falling weight deflectometer testing. this in-depth analysis showed the roadway’s base was in satisfactory condition, opening the door for using more cost-efficient rehabilitation measures to repair the corridor.

roadway patching, construction phasing & ada compliance measures

ada-compliant sidewalk ramps were improved along the entire corridor.

the rehabilitation measures put forward by our team included the use of full- and partial-depth patching, diamond grinding of the roadway surface, repairs to the curb and gutter areas where needed, and the replacement of ada-compliant sidewalk ramps. in addition, accessible pedestrian signal (aps) pushbuttons were included at numerous intersections. the aps buttons use audible tones to communicate when a pedestrian should cross the street.

the partial- and full-depth patching measures were used to restore the structural integrity of the concrete pavement, while the diamond grinding process provided a smooth riding surface to the finished pavement surface. improvements to the ada-compliant sidewalk ramps and the addition of pedestrian signals create a safer pedestrian experience through the corridor.

heavy traffic concerns met with staged pavement repair process

this heavily trafficked corridor with five signalized intersections accommodates over 18,000 vehicles per day. from the start, this heavy traffic volume created unique design and implementation challenges for our team. to keep traffic flowing during the rehabilitation process, the project included three construction phases, utilizing multiple traffic staging layouts along the five-lane corridor. access to homes, businesses, parks, and side streets was maintained throughout most of the project, with detours being provided when necessary.

with the kiwanis avenue rehabilitation efforts concluded, this major corridor is once again fully serving the members of the community. the pavement restoration efforts our team was able to implement headed off more serious and costly solutions down the road and will allow for many more years of service. thanks to the city of sioux falls for identifying this corridor for study, our cost-effective strategy saved money for taxpayers by providing restoration to the pavement at the right time.

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