1st Avenue Improvements

1st Avenue Improvements: 6th Street to 9th Street

1st Avenue between 6th Street and 9th Street will undergo total reconstruction in 2018. This is the final section of 1st Avenue that needs to be improved south of Interstate 80.


After work is complete, this stretch of 1st Avenue will feature:
  • Four through lanes and one continuous center turn lane
  • 10 foot wide sidewalks on both sides
  • Upgraded traffic signals at E. 7th Street
  • New traffic signals at 6th Street with a new four-leg intersection at 1st Avenue and 6th Street to accommodate a future connection of E. 2nd Avenue on the east leg
  • New public utilities (storm sewer, sanitary sewer, and water main)
  • Lighting
  • Streetscaping
Finishing 1st logo


  • Bid in January 2018 IDOT letting
  • Low bid: $7,186,554.84 (Langman Construction of Rock Island, Illinois) 
  • Funding: $5.1 million of Surface Transportation Program funds, and local funds


  • Estimated start: March 2018, weather permitting
  • Estimated completion: December 2018, weather permitting (driving lanes, sidewalks, and traffic signals)
  • Landscaping and final work: Spring 2019, weather permitting

Traffic Impact

  • There will be traffic delays
  • Single lane traffic in both directions along 1st Avenue will be maintained
  • Pedestrian access will be maintained using temporary surfacing and channelizing barriers
  • Access to all businesses will be maintained
  • 6th Street will be closed between 1st Avenue and the Baymont Suites driveway from approximately late April until late July
  • The temporary traffic signals at the 1st Avenue/E. 7th Street intersection will be removed in late winter/early spring 2018 while E. 7th Street is closed and reconstructed
  • Temporary traffic signals will be installed in the summer of 2018 at the new 1st Avenue/6th Street/E. 2nd Avenue intersection during construction. This signal will provide construction access to the new E. 2nd Avenue for the Iowa Arena/UIHC Phase 2 Clinic Projects. 

Public Transit Impact

  • Coralville Transit riders may experience delays on all routes, especially during peak traffic times. Any changes to routes and schedules will be posted on www.coralville.org/transit.


Maps & Documents

Contact Us

  1. Dan Holderness

    City Engineer

    Scott Larson

    Assistant City Engineer

    1512 7th St.
    P.O. Box 5127
    Coralville, IA  52241

    Ph: 319.248.1720
    Fx: 319.248.1894

    Staff Directory
1st Ave Construction Map 2018




Weekly job meetings are Thursdays at 9:00 am at City Hall, until further notice. The public is welcome to attend and participate.

Lane Closures/Traffic Changes

  • 1st Avenue traffic is reduced to one lane in both directions from south of 6th Street to south of E. 7th Street, and the two lanes shift east onto temporary pavement (see Phase 2 – Stage 1 in Resources: "Project map and construction phases").
  • 6th Street west of 1st Avenue is closed between 1st Avenue and the Baymont Inn & Suites driveway (see Phase 2 – Stage 1 in Resources: "Project map and construction phases"). Information about impacted Coralville Transit routes and stops is available at www.coralville.org/transit.
  • The inner left turn lane on eastbound 5th Street approaching 1st Avenue is closed until further notice to simplify the merging of 5th Street traffic turning left onto northbound 1st Avenue. 
1st Ave lanes shifted east 04.26.18

Current & Upcoming Work*

Work completed the week of May 14 includes:
  • The sanitary service connection for the Drury Hotel was completed ahead of schedule and the southbound lane reduction near Kum & Go and Perkins was removed on May 17. 
  • The sanitary sewer work under the CRANDIC Railroad crossing is complete.
  • The storm sewer installation on 6th Street is substantially complete.
  • Crosswalk markings will be added to the pedestrian detour path soon.        
Work expected the weeof May 21:
  • Work continues on Phase 2 – Stage 1 (west half of 1st Avenue & 6th Street intersection, and 6th Street west to the Baymont Inn & Suites driveway) (see Phase 2 – Stage 1 in Resources: "Project map and construction phases").
  • Complete fire hydrant relocation on the northwest corner of 1st Avenue & 6th Street.
  • Continue installing sanitary sewer north of the CRANDIC Railroad crossing.   
Looking ahead:
  • Phase 2 – Stage 1 is scheduled for completion on July 25.  
  • Phase 2 – Stage 2 will get underway sooner than the current June 7 start date shown in the schedule, with the goal of speeding up completion of the overall Phase 2 work.  A start date for Phase 2 – Stage 2 will be determined later as progress is made on Phase 2 – Stage 1.  
*Updated May 17, 2018

Merging Traffic

How to Merge Efficiently on 1st Avenue

When traffic is slow and heavy, merging too early can create traffic backups. During peak traffic times on 1st Avenue, using a "zipper merge" can keep traffic moving and reduce traffic backups.

A "zipper merge" is when drivers use both lanes of traffic until they reach the defined merge area, and then alternate in "zipper" style into the open lane. This maximizes road space, reduces congestion, and allows both lanes to move at similar speeds.

How to "Zipper Merge"
  1. Watch for signs giving drivers notice that there is a merge ahead
  2. Stay in your lane up to the point of merge
  3. Take turns with drivers to safely ease into the remaining lane
  4. Always merge when it is safe

Merging FAQs

When is it best to use the zipper merge?

When traffic is congested and traveling at slower speeds, it is best to remain in your lane until the point where traffic can take turns merging, which is indicated by a "BEGIN MERGE" sign.

When is it best to merge early?
When traffic conditions are light and vehicles are traveling at highway speeds, it is best to merge as soon as safely possible.

Zipper Merge Resources

Take Turns sign

Pre-Project Planning

How We're Keeping Traffic Moving

To reduce traffic delays during construction:
  • Staff will monitor traffic times and adjust the timing of traffic signals as needed to help the traffic flow on 1st Avenue
  • Installed fiber optic communications at the 1st Avenue/E. 9th Street traffic signal
  • Installed pan/tilt/zoom cameras on 1st Avenue at both 5th Street and E. 9th Street, along with existing cameras at 1st Avenue/Highway 6, to remotely monitor traffic for the project corridor and beyond
  • Repositioned the traffic detection cameras at 1st Avenue/E. 9th Street to minimize false detections
  • Installing traffic detection cameras at the 1st Avenue/Interstate 80 traffic signals to replace the in-pavement traffic detection wire loops (spring 2018)

Duct Bank NB Lane 062017

Duct Banks

In anticipation of the 
project, underground duct banks were proactively constructed in 2017. These duct banks provided places for the private utilities companies to relocate their overhead and underground facilities to be out of the way before the 2018 improvement projects. The duct banks should minimize delays caused by private utility relocations, which can be common during street projects.

Stay Informed

  1. Temporary Closure of Deer Creek Road

    Closed on Thursday, May 24 to allow Iowa Interstate Railroad to replace a damaged rail Read on...
  2. Coral Ridge Avenue Detour Begins

    Beginning Sunday evening, May 13, traffic will detour using Oakdale Boulevard, Crosspark Road, & Wheaton Road Read on...
  3. Traffic Control Modification at Oakdale Boulevard & Crosspark Road Intersection

    Begins Monday, April 23 Read on...
  1. 1st Avenue Construction Begins Next Phase on April 24

    6th Street to close between 1st Avenue and Baymont Inn & Suites driveway, 1st Avenue reduced to one lane in each direction near 6th Street intersection Read on...
  2. Construction to Begin on 1st Avenue from 6th Street to 9th Street

    Northbound 1st Avenue will be reduced to one lane from just south of 6th Street to just south of 9th Street Read on...
  3. Two Major Road Reconstruction Projects Begin This Spring

    Drivers should prepare for 1st Avenue & Coral Ridge Avenue road work Read on...
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