Key Component of Growth & Expansion
To support new development on the southeast side of Ankeny, Iowa, efficient access was critical. The new Iowa Department of Transportation (DOT) License station, warehouse home centers, hotels, and other commercial properties were depending on roadway infrastructure to support exponential growth and vehicular traffic.
Shuck-Britson and Snyder & Associates teamed with public works engineers from Ankeny and Polk County, and Iowa DOT staff from District 1, Office of Design, and Office of Bridges and Structures. The aggressive schedule desired by the city and Iowa DOT required important decisions to be made quickly. A cohesive team effort was the basis of collaboration for project planning and sound decisions.
New Corporate Woods Drive Bridge
A significant amount of fill placement was required to achieve the new Corporate Woods Drive interchange grading configuration. Through coordination with geotechnical engineers, proper construction procedures and specifications were identified to control settlement of new roadway fill.
Roadway alignment and geometry was established early to spring design for the steel plate girder bridge featuring a new aesthetic theme. The steel girder design was optimized for the required span lengths over I-35 and to provide proper clearance for interstate traffic below.
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 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
Pedestrian access was recognized as 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. West approach grading incorporates a sidewalk with switchback and benched berm to carry the sidewalk back under the west bridge span to the south side to connect with a future sidewalk.
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).