NW 70th Avenue Improvements

Overall Project Update


Phase I construction is complete. Phase II construction will being in the Spring of 2018.  Phase III is in the preliminary design phase and it is estimated that construction of this phase will being in the spring of 2019. The total estimated cost for both phase II and Phase III is $7,361,434.50. Click on this link to watch a video on the correct way to drive through a roundabout.  Click here to see overall map and plans for NW 70th Avenue (PDF)The City of Johnston is beginning the design of the 3rd and final phase of the NW 70th Avenue Improvements. The intent of this project is to reconstruct 70th Avenue from 98th Street to approximately 600 feet west of Peckham Street in 2019.

Phase II (Project Update: 5/31/18)


NW 70th Avenue between Peckham and 86th Street have been closed since April 16. Water main installation for the entire project has been completed. Storm sewer installation is on schedule to be completed by the end of next week, June 8. The new roadbed continues to be constructed and paving is scheduled to begin mid to late June.


Previous Communication 
  • Click here (PDF) to view the presentation from the construction meeting on March 27, 2018. The meeting was intended to provide property owners information with respect to the project construction activities. 
  • Click here (PDF) to view the letter dated March 9, 2018 sent to residents. 
  • Click here to view the presentation given at the public meeting on February 21, 2018.
  • Click here (PDF) to see a map of the project area.

Estimated Cost: $3,088,228.91

Estimated Start Date: Spring 2018

Estimated Completion Date: Fall 2018

Contractor: Concrete Technologies, Inc.

Engineer: Foth Infrastructure & Environment, LLC, Andy Floy, andy.floy@foth.com, 515.251.2594

City Staff Project Contact: Matt Greiner, Public Works Director, mgreiner@cityofjohnston.com, 515.278.0822

Project Status: Construction

Phase III
Between Peckham Street and NW 98th Street after completion of Phase II.  Click here to see a map of the project area.

Estimated Cost: Currently being determined.

Estimated Start Date: Spring 2019

Estimated Completion Date: Undetermined

Contractor: Yet to be determined

Engineer: Foth Infrastructure & Environment, LLC

City Staff Project Contact: Matt Greiner, Public Works Director, 515.278.0822

Project Status: Preliminary design phase

There will be no property owner assessments as part of Johnston’s project. A thorough traffic study of the corridor was performed and concluded that a series of three roundabouts handles existing traffic and future increases in traffic.

Click here to learn more about roundabouts and why they're being chosen as the safest method for intersection control on some Johnston streets.

Current traffic on NW 70th Ave is 13,000 vehicles per day. By 2035, traffic is projected to grow to 20,000-26,000 vehicles per day. The proposed design accounts for this increase and concludes that acceptable levels of service will be maintained through 2035.

The impetus for the entire project is to be ready for the high school that will be built nearby and to address current and future traffic as the area continues to develop. This project will no doubt be a significant project for the City of Johnston. We couldn't do it without your input and patience.

We want to keep you informed every step of the way, so we are building an e-mail database. Your e-mail will not be shared with anyone. If you would like to get on the list, please e-mail us here.

We encourage you to also "like" the City of Johnston Government Facebook page and also follow us on Twitter @cityofjohnston. We will provide frequent updates there and here on our website.

If you ever have any questions about the improvements, please feel free to contact Public Works Director Matt Greiner.