1st Avenue Improvements
1st Avenue Improvements: 6th Street to 9th Street
1st Avenue between 6th Street and 9th Street is undergoing 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)
- 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
- Start: March 2018
- Estimated completion: December 2018, weather permitting (driving lanes, sidewalks, and traffic signals)
- Landscaping and final work: Spring 2019, weather permitting
- There are traffic delays
- Single lane traffic in both directions along 1st Avenue is maintained
- Pedestrian access is maintained using temporary surfacing and channelizing barriers
- Access to all businesses is maintained
- 6th Street is 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.
ResourcesMaps & Documents
- "Next Phase of 1st Avenue Construction Begins April 24"
- "1st Avenue Update: Week of April 16"
- "1st Avenue Update: Week of April 9"
- "1st Avenue Update: Week of April 2"
- "1st Avenue Update: Week of March 26"
- "1st Avenue Road Reconstruction: The Basics" (March 20, 2018)
- More videos available in the future
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.
Current & Upcoming Work*
Work completed the week of May 21 includes:
- Crosswalk markings were added at three locations along the 1st Avenue pedestrian detour path.
- Pavement removal within Phase 2 – Stage 1 will be complete May 24 or Friday, May 25 (see page 3 of "Project map and construction phases").
- Sanitary sewer installation continues north of the CRANDIC Railroad crossing.
- Continue installing sanitary sewer north of the CRANDIC Railroad crossing.
- Begin water main installation along the west side of 1st Avenue from Pipeline Road working north. The last remaining segment of 6” diameter cast iron water main along 1st Avenue will be replaced with 12” diameter ductile iron water main.
- Complete storm sewer installation south of the CRANDIC Railroad crossing.
- Grade all street pavement areas south of the railroad crossing, including 6th Street, for placement of subdrain tile and granular subbase (compacted gravel). Placement of granular subbase is the last step required before pouring the new concrete pavement.
- Begin pouring new concrete pavement within Phase 2 – Stage 1 south of the CRANDIC Railroad crossing during the week of June 4th.
- The new target date to begin the combined Phase 2 – Stages 1 & 2 is June 4th. Traffic will be shifted to the far east side of 1st Avenue along the entire length of the project and will make full use of the temporary pavement that was constructed earlier in the project.
- Phase 2 – Stage 1 is scheduled for completion on July 25th (reopens the connection from 6th Street to 1st Avenue).
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"
- Watch for signs giving drivers notice that there is a merge ahead
- Stay in your lane up to the point of merge
- Take turns with drivers to safely ease into the remaining lane
- Always merge when it is safe
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
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)
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.
- Sign up for e-news alerts ("Construction and Traffic Updates" category)
- Like City of Coralville, Iowa on Facebook
- Follow the City of Coralville, Iowa on Twitter
- Join Nextdoor (a private social network for Coralville neighborhoods)
- Pay attention to construction message boards along 1st Avenue during construction
- Check local news for media releases
- Attend weekly meetings with the City and the contractors, and open to the public:
- Thursdays beginning March 22, 2018
- 9:00-10:00 am
- Coralville City Hall (1512 7th St.)
- call 319.248.1720 for more information
Beginning Sunday evening, May 13, traffic will detour using Oakdale Boulevard, Crosspark Road, & Wheaton Road Read on...
Begins Monday, April 23 Read on...
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...
Northbound 1st Avenue will be reduced to one lane from just south of 6th Street to just south of 9th Street Read on...
Drivers should prepare for 1st Avenue & Coral Ridge Avenue road work Read on...
New traffic signals are now in operation Read on...