First Avenue serves as a main north-south arterial roadway in Iowa City, Iowa. Each day, approximately 13,000 vehicles utilize the corridor, with future volume expected to increase. Due to a mix of development in the area, including South East Junior High School, the corridor is also home to a notable amount of pedestrian and bicycle traffic.
With an average of two to four trains passing through the area and blocking First Avenue every day, there were major traffic delays and safety concerns for vehicles and pedestrians. Traffic studies reported an average wait time of 10 to 20 minutes for idle vehicles while the crossing was blocked. Commuters that chose to explore alternative routes were detoured at least four miles to the nearest grade-separation crossing at Summit Street.
Recognizing the need for improved traffic flow and safety throughout the corridor, Iowa City began exploring its options in 2005. Flooding and other unforeseen circumstances postponed the project for a few years leading up to 2014 when Snyder & Associates was contracted for the project.
To avoid conflicts with train traffic altogether and allow for seamless traffic flow on First Avenue, we developed a plan to lower First Avenue approximately 16.5’ and raise the Iowa Interstate Railroad (IAIS) 5’, creating a grade separation crossing.
Construction consisted of five main stages beginning in April 2015 and concluded in fall 2016:
A new railroad bridge, street paving, retaining wall, storm sewer, water main, and other related work was included as part of the project. The existing four-lane arterial roadway was reconstructed as a three-lane section with a bike lane in each direction. Significant retaining walls were constructed to include aesthetic elements, such as a decorative form liner, stain, and aluminum railing.
Total project construction cost is approximately $10 million. Project funding includes $2.4 million from the Surface Transportation Program (STP), $500,000 from the Traffic Safety Improvement Program (TSIP), and $550,000 from the IAIS, with the remaining dollars covered in general obligation bonds.
During the APWA Iowa Chapter’s Annual Fall Conference Awards Banquet, Snyder & Associates proudly joined staff members from Peterson Contractors, Inc. and the City of Iowa City to accept the Project of the Year award in the Transportation category, greater than $2.5 million.
Project team members pictured above (left to right): Jordan Muller, Peterson Contractors; Zach Steffen, Peterson Contractors; Jason Reichart, City of Iowa City; Troy Culver, Snyder & Associates; Andy Burke, Snyder & Associates; Jason Havel, City of Iowa City.
Complete Snyder & Associates/Shuck-Britson project team pictured above, front row (left to right): Subhija Rahmanovic, Structural Engineering; Diane Goering, PLA, landscape architecture and aesthetics; Andy Burke, P.E., Project Manager; Todd Knox, P.E., PTOE, traffic signal and street lighting. Back row (left to right): Jerome Hatlewick, P.E., Structural Engineering; Heather Fritz, Engineering Technician; Jordan Gustafson, Structural Engineering; Rich Voelker, P.E., Project Director