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.

Highlights


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 and streetscaping
Finishing 1st logo

Cost


  • 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

Timeline


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

Traffic Impact


  • 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
  • The temporary traffic signals at the 1st Avenue/E. 7th Street intersection are removed while E. 7th Street is closed and reconstructed
  • Temporary traffic signals at the new 1st Avenue/6th Street/E. 2nd Avenue intersection provide construction access to the new E. 2nd Avenue for the Iowa Arena/UIHC Phase 2 Clinic Projects.
  • 6th Street closed between 1st Avenue and the Baymont Suites driveway from late April-mid September

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.

Contact Us

  1. Dan Holderness


    City Engineer
    Email

    Scott Larson


    Assistant City Engineer
    Email

    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

Resources

Maps & Documents

Updates*

  

Meetings


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 the entire length of the project, from 6th to 9th Streets (see Resources: "Phase 2 - Stages 1 and 2").
  • The inner left turn lane on eastbound 5th Street approaching 1st Avenue is closed to simplify the merging of 5th Street traffic turning left onto northbound 1st Avenue. 
  • E. 7th Street between 1st Avenue and E. 2nd Avenue is closed for total reconstruction. Use E. 9th Street to access the Iowa River Landing. A construction access road connected to 1st Avenue near the railroad crossing minimizes traffic impacts from the large redevelopment projects in the Iowa River Landing.
1st Ave lanes shifted east 04.26.18
  • Southbound 1st Avenue drivers wanting to continue south through the 1st Avenue project work zone (blue path) must be in the right lane immediately after passing the I-80 eastbound off-ramp.
  • Southbound 1st Avenue drivers wanting to turn left onto E. 9th Street (black dash path) must be in the left lane immediately after passing the I-80 eastbound off-ramp.
  • Channelizing devices will separate the two lanes immediately south of the off-ramp. Both the Magellan Pipeline access and the dedicated southbound right turn lane onto 9th Street are maintained. 

Southbound 1st Avenue traffic

1st Ave SB traffic control

Completed paving (in green) as of October 18, 2018

1st Ave paving update October 18, 2018

Current & Upcoming Work*

Work completed the week of October 15:
  • Pouring additional sidewalk and subslab across the Super 7 frontage on Friday.
  • Completed brick paver work within north half of Pipeline Road.
  • Completed brick pavers within east-west crosswalks at E. 7th Street and across the Super 7 driveway.
  • Continuing to work on retaining walls across McDonald’s and the vacant lot to the north. 
  • Continued light pole footing installation along the west side of 1st Avenue.  As of Thursday, ten new light poles have been installed along the west side of 1st Avenue. 
  • Continuing subgrade preparation on the east side of 1st Avenue south of Super 8.  
  • CRANDIC Railroad and their contractor are onsite near 6th Street working on conduits related to the new railroad crossing signals and gates that should be installed later this year. 
  • The solid green areas (see image) indicate completed street paving, driveways, sidewalks, and paver subslabs.  Note that some of the subslab areas still need brick pavers installed.  
Work expected the week of October 22:
  • Continue working on retaining walls across McDonald’s and the vacant lot to the north.
  • Continue work on sidewalk, retaining walls, and steps along the north side of 6th Street west of 1st Avenue.
  • Traffic control change expected on Wednesday, October 24:
    • Head-to-head traffic will shift onto the new west half of 1st Avenue through the entire project corridor.  A press release will be issued when the specific time for the shift is confirmed. 
    • Pedestrians will be able to use the new sidewalk along the west side of the project corridor, except between Pipeline Road and the southerly Days Inn driveway. Work continues in this area on retaining walls, so a pedestrian corridor will be established using concrete barriers against the 1st Avenue vehicular traffic and orange plastic barriers against the retaining wall work zone.  
  • Complete light pole installation along the west side of 1st Avenue.
  • Begin paving the east side of 1st Avenue south of Super 8’s driveway.    
Looking ahead:
  • The head-to-head traffic shift onto the new west half of 1st Avenue on October 24 clears the way to remove the temporary pavement on the east half of 1st Avenue. This will be followed immediately by reconstruction of the east half of 1st Avenue (street and sidewalk paving, light poles, signal poles).  Minimal underground utility work remains, with fewer driveway conflicts along the east half of 1st Avenue. The 1st Avenue new street paving is expected to be completed much quicker on the east half  than the west half.   
  • The Substantial Completion Date is November 30, 2018.  This is the date when all streets, sidewalks, traffic signals, and lighting are to be complete and usable by the public.  
*Updated October 18, 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
  • Installed traffic detection cameras at the 1st Avenue/Interstate 80 traffic signals to replace the in-pavement traffic detection wire loops

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. Pavement Patching on 10th Avenue Place

    Begins October 8 and expected to be complete by October 22, weather permitting Read on...
  2. 6th Street Connection to 1st Avenue to Re-Open on September 18

    Use caution through the work zone and watch for pedestrians, bicyclists, and construction workers Read on...
  3. 1st Avenue Construction Begins Next Phase on June 4

    1st Avenue will be reduced to one lane in each direction the entire length of the project, from just south of 6th Street to just south on 9th Street Read on...
  1. Coral Ridge Avenue Detour Begins

    Beginning Sunday evening, May 13, traffic will detour using Oakdale Boulevard, Crosspark Road, & Wheaton Road Read on...
  2. 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...
  3. 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...
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