Ada County Highway District

State Street and Collister Drive Intersection

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Construction Update as of 06/18/19: Collister Drive was previously planned to be closed from June 22nd to June 30th to allow for multiple utility relocations. However, due to a scheduling conflict with one of the contractors there will now be three separate closures of Collister Drive over the course of the next month.

The first closure will be June 22-23rd, at the intersection of State and Collister. Traffic will be able to travel south on Collister Drive from Hill Road to access local businesses but will not be able to proceed through the intersection. The second closure will have the same configuration and will be June 29th-30th.

The third closure will be a week long closure from July 8th-12th, the road will be closed from State Street to the northern most entrance of the Samaritan Village Apartments. Suez will be installing a new water main on Collister Drive. Access to local businesses and residences will be maintained.

Construction Update as of 6/14/19: Traffic was shifted onto the new pavement on the south side of State Street on June 11th. Crews are now working on the north side of State Street. Collister Drive will be closed from June 22nd to June 30th for utility relocations.

Construction Update as of 6/7/19: There will be a traffic shift the night of Tuesday, June 11th. Traffic on State Street will move to the south side of the road to allow for work to begin on the north side. This will be the traffic configuration for the next phase of construction.

Crews will begin setting up lane restrictions at 8:00 PM on Tuesday night. Work to remove existing striping and paint new striping will begin at 9:00 PM. The new traffic pattern will be in place by the morning commute Wednesday, June 12th. 

Construction Update as of 5/20/19: The concrete placement planned for Tuesday, May 21st has been delayed to Wednesday, May 22nd due to weather.

The second concrete placement will be on Saturday, May 18th. The work will begin at as early as 6:00 AM and will require an eastbound lane closure. This is the second of three concrete placements needed for the south side of State Street. The third placement is tentatively expected for Tuesday, May 21st (weather depending). That work would begin as early as 4:00 AM and would not require a lane closure until after the AM peak travel hours. Asphalt paving is expected to begin late May.

Construction Update as of 05/08/19: Concrete paving for the south side of State Street will begin on Saturday, May 11th, at 6:00 AM. Work will start on the western edge of the project near the Edgewater Apartments and work east. There will be an eastbound lane closure in place all day Saturday for this work.  Concrete paving will continue for about two weeks.

Construction Update as of 05/06/19: Concrete paving is expected to begin as early as May 9th. Work may be done at night or during the day depending on concrete availability. Work will begin on the western edge of the project near the Edgewater Apartments and move to the east near Thriftway.

Construction Update as of 4/25/19: Crews are working on roadway construction on the south side of State Street, including seepage beds and placement of base gravels. Work on curb, gutter and sidewalk west of Collister is complete. Work on curb, gutter and sidewalk east of Collister is underway. Concrete paving is scheduled to begin in late April, weather dependent.

Construction Update as of 3/25/19:

Crews are working on roadway construction on the south side of State Street, including seepage beds and placement of base gravels. Concrete paving is scheduled to begin in late April.

Box culvert is complete and crews are working on backfill.

Wylie Lane/State Street: Work began last week in coordination with the State/Collister project. Crews are working on signal pole foundations.

Construction Update as of 3/5/19:

There will be night work on March 6th to 8th, as well as March 11th. Crews will be installing precast for the Farmers Union Canal. During this work there will be lane reductions on State Street.

On March 11th, work at Wylie/State will begin to install a signalized pedestrian signal. This is a separate project being built in conjunction with the State and Collister intersection project. The pedestrian signal project is expected to be complete by mid-summer 2019.

Construction Update as of 2/26/19:

South State Street: There will be night work on March 6th to 8th. Crews will be installing precast for the Farmers Union Canal. This will require lane restrictions for both eastbound and westbound State Street. This work is weather dependent and subject to change.

On-going work includes: utility relocations, storm drain installation, work on the box culvert on the north side of State Street, work on the structure at Wylie Lane.

Traffic on State Street shifted on Thursday, January 31st. Traffic west of the State/Collister intersection is now on the north side of the road.  Crews placed asphalt pavement on Wednesday, January 30th, to serve as a temporary driving surface.

Saturday, January 5th there was a traffic shift on State Street. Traffic to the north side of State Street east of the State/Collister intersection. Traffic remains on the south side of State Street west of the intersection. There will be a second swap for the western portion of the project at a later date.

Pedestrians and bicyclists will use the sidewalk on the south side of State Street west of the intersection and the sidewalk on the north side of State Street east of the intersection. Valley Regional Transit determines bus stop locations. Please visit the Valley Regional Transit webpage to learn more about the temporary bus stop locations.

View the traffic pattern map for phase 2a of the project.

As of Friday, November 9th, left turns directly from eastbound State Street onto Collister Drive have been restricted for the duration of construction. 

See information about the phasing of this project and what the improvements to the intersection will be when completed. The State Street Bridge #1408 project will be constructed in conjunction with this project.

Construction is Underway!
The Ada County Highway District (ACHD) and Concrete Placing Company are rebuilding the intersection of State Street and Collister Drive. Utility work began at the end of September and will continue with canal work beginning in mid-October. Construction will start in November. Crews will also be working on the bridge just west of the intersection. 

What can neighbors & commuters expect?

  • Work is anticipated to occur between 7 a.m. and 10 p.m. Night work and weekend work is expected.
  • Work will include, but not be limited to, general construction noise, dust, equipment backup alarms, and ground vibration.
  • Access to businesses will remain open at all times, although ingress and egress may be shifted to accommodate construction. If business access will be impacted, the contractor will coordinate with adjacent businesses.

Learn More

Stay Informed


State Street
Working closely with the public since 2004, agencies throughout Ada County have been developing and building out a vision for the State Street corridor. State Street's planned improvements include widening the roadway to improve traffic flow, adding a lane dedicated to carpools, vanpools, and buses and also improving biking and pedestrian infrastructure. This collaborative approach will bring communities closer together by increasing mobility options to benefit everyone.


Project Update September 2016

Noise Study & Sound Wall
A study completed as part of the project shows traffic noise in the project area currently exceeds state and federal noise policy standards in some locations and is expected to increase as traffic increases over the next 20 years. The study concluded that a sound wall on the south side of State Street will reduce noise impacts to the Edgewater Apartments. ACHD worked closely with the owners of the apartments and came to an agreement to build the sound wall as part of the project.

The agreement allows ACHD to move forward with the following schedule:

  • Environmental Evaluation Approval - Fall 2016
  • Final Design - Fall 2016 to Summer 2017
  • Right-of-way negotiation/purchase - Summer/Fall 2017
  • Construction - Fall 2018 to Fall 2019

Materials from May 28, 2015 Open House & Public Hearing


State and Collister Intersection Open House & Public Hearing

  • May 28 | 5:30-7:30 p.m.
  • ACHD Offices | 3775 Adams Street, Garden City*

State and Collister Intersection Project

Join us!

State and Collister Intersection Open House & Public Hearing

  • May 28 | 5:30-7:30 p.m.
  • ACHD Offices | 3775 Adams Street, Garden City*

The Ada County Highway District (ACHD) is seeking comments on the new intersection design for State Street and Collister Drive. The design, based on the Alignment 1- Realignment concept approved by the ACHD Commission in November 2014, includes safety improvements at the intersection for those that bicycle, walk, drive and use transit.

Community input is important! Residents are encouraged to attend the meeting, view the design and provide comments. Attendees will have the option of providing oral testimony to a hearing officer on a one-on-one basis or submitting written comments. 

*Adams Street between 40th and 38th streets may be closed for construction. Please use 37th Street off of Chinden Boulevard to access Adams Street.


On November 12, 2014 the ACHD Commission approved Alignment 1 - Realignment with the following Commission-directed actions for possible inclusion as the design develops:

  • Add a hard-scaped median for left turns into the shopping center from State Street.
  • Retain the westbound bus stop.
  • Add a signalized crossing or signal at Wylie Lane/Sycamore and State Street, though outside the boundaries of the recommended realignment.
  • Add signage along State Street to make up for the loss of frontage, incorporate into one center.
  • Priority should be given to limit conflicts between pedestrians and vehicles.
  • Discuss what will happen with people on the south side of State Street.
  • Provide ingress/egress to On the Fly where Collister is today.

Opportunity for Public Input: State and Collister to be presented to ACHD Commission Nov. 12

ACHD Commission Meeting
Wednesday, November 12, 2014 | Noon
ACHD Auditorium | 3775 Adams St., Garden City

At the October 22nd Commission meeting, the ACHD Commission asked staff to meet with stakeholders to consider more input on the 's recommended realignment of the intersection as the preferred alternative. Two workshops were held with stakeholders to discuss issues and brainstorm suggestions and potential revisions to the realignment alternative.

As a result, the State and Collister Intersection Project will again be presented to the Ada County Highway District (ACHD) Commissioners on Wednesday, November 12th at noon for a decision on which alignment option to adopt. Taking into consideration public opinion, long-range transportation plans, capital investment, property/business access impacts, and the best and safest alternative for all users of the roadway, ACHD staff will recommend Alignment 1 - Realignment to the Commissioners.

The Commission meeting will begin at noon; however, this project is one of several agenda items and may not be the first item discussed. ACHD staff will make a brief presentation, including a summary of what was heard from the stakeholders, followed by an opportunity for public comment before the Commission takes action.


August 18, 2014 Open House

Learn about the proposed State and Collister intersection project! Materials from the open house can be found to the right under "Related Documents."


The State Street and Collister Drive intersection provides connectivity between various neighborhoods north of State Street and the businesses along State Street. ACHD is proposing safety improvements to the intersection for all users - motorists, pedestrians, bicyclists and transit users.

  • Develop and evaluate intersection alternatives to improve safety for all users.
  • Improve/possibly realign Collister Drive approach.
  • Includes the State Street Bridge #90B, located to the west of Collister Drive.
  • This is a federal aid project.

Project goals

  • Improve safety of the intersection
  • Gain stakeholder consensus through a public involvement process
  • Coordinate adjacent land uses (current and future) with the intersection design

State Street studies


Time Frame

Start Date:
Fall 2018
End Date:
Late 2019

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