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With growth and increased traffic along this important commuter corridor, additional lanes and improvements will be added.

Over the next few years the Idaho Transportation Department will be making improvements to Chinden Boulevard (U.S. 20/26) between Star Road and Eagle Road to promote safety and increase capacity in this growing region of Idaho. Public input and participation is critical to the success of these efforts.

A public open house was held on Monday, November 5, from 4-6 p.m. at The Ambrose School in Meridian. The project team provided information, answered questions and gathered feedback. The display boards can be found in the Downloads and Resources.

Read MoreAsset 1
November 2018 Open House Displays Asset 2
Contact Us
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(208) 334-8007

Project Overview

As identified in the graphic below, planned improvements are divided into different segments. Each segment has a unique schedule and they are not scheduled for construction in a consecutive, east-to-west or west-to-east sequence. Instead, segments will be constructed in order of most urgent need and available funds. All segments will widen the highway from 2 to 4 lanes. During construction, work will occur day and night with traffic limited to one lane in each direction. The segments are as follows:

Star Road to Idaho Highway 16

Construction is currently scheduled for 2024.

Idaho Highway 16 to Linder Road

This segment is currently in design with construction anticipated to begin in late 2019 and continue into 2020. It is funded through a Sales Tax Anticipation Revenue (STAR) agreement with Costco Wholesale, developer of a multi-use development on the southwest corner with Ten Mile. Through the STAR agreement, Costco will pay for the roadway improvements and be reimbursed through sales tax revenue generated by the development.

Linder Road to Meridian Road

This segment is currently in design with construction anticipated to begin in late 2019. It is funded through a STAR agreement with the “Linder Village” developer on the southeast corner with Linder.

Meridian Road to Locust Grove

This segment is currently in design with construction anticipated in 2021. It is also funded through the Linder Village STAR agreement.

Locust Grove to Eagle Road

Construction is currently scheduled for 2020.


Chinden Boulevard, a section of U.S. 20/26, is one of the few east-west commuter routes that connects Boise to Interstate 84 in Caldwell. The majority of Chinden between I-84 and Eagle Road is a two-lane rural highway. As the land around the roadway develops, Chinden is becoming a busy urban corridor, particularly between Ten Mile Road and Eagle.
Large-scale commercial and residential developments are being planned at the southwest corner with Ten Mile and the southeast corner with Linder Road. With development expected to continue, the region is transforming from a historically agricultural area to an urban corridor.

From 2015-2017, ITD conducted an Environmental Assessment (EA) of the corridor to determine recommended roadway improvements and identify right-of-way needs through 2040. The National Environmental Policy Act (NEPA) process included an extensive public involvement effort featuring public open houses, property owner meetings, online public meetings and live online Q&A sessions. ITD also worked closely with its local government partners to identify needs and develop solutions that meet the future demands of this growing region in Ada and Canyon counties.

The resulting recommendation includes the following improvements by 2040:

Project Vision

Phase 1 (FUNDED): Expand Chinden from 2 lanes to 4 lanes between Eagle and Star Road, and expand Chinden from 2 lanes to 6 lanes between Smeed Parkway in Caldwell to Middleton Road (schedule in development).
Phase 2: Projections suggest a long-term need for 6 lanes from Eagle to I-84, ultimately. ITD will construct additional lanes when required based on traffic demand and when
funding becomes available.
Phase 3: Construct high-capacity intersections at Middleton, Star, Linder, Meridian, Locust Grove, and Eagle roads.

What is a CFI?

The EA identified the future need for high capacity intersections at Middleton Road, Linder Road, Meridian Road, Locust Grove Road, and Eagle Road. One option under consideration is Continuous Flow Intersections (CFI), example in the linked graphic below. CFI’s can accommodate higher traffic volumes than a traditional intersection. Current traffic and near-term demands do not warrant CFI’s at this time. Planned improvements feature traditional intersections with the ability to expand to CFI’s when necessary.

View the CFI Diagram
US-20/26 Highway

National Environmental Policy Act

The National Environmental Policy Act (NEPA) is a procedural statute (40 CFR parts 1500 thru 1508) for decision-making during federal projects that assures proper analysis of social, economic and environmental impacts are performed and disclosed. Chinden work is federally funded through FHWA and as such is subject to federal regulation. ITD, in consultation with FHWA, followed the NEPA process to prepare a NEPA Document. The NEPA process studied a reasonable range of alternatives, considered appropriate mitigation for impacts, included interagency coordination and consultation, and provided the public an opportunity to participate in the process and comment. The studies, agency coordination, public participation process and comments are all summarized in the EA.

View the Environmental Assessment Document
Environmental Assessment
Asset 5
State Highway 16 to Linder Anticipated Construction
Asset 5
Locust Grove to Eagle Anticipated Construction
Asset 5
Linder to Meridian Anticipated Construction
Asset 5
Meridian to Locust Grove Anticipated Construction
Asset 5
Star to State Highway 16 Anticipated Construction
Asset 5

Downloads & Resources

November 2018 Open HouseAsset 4
U.S. 20/26 Corridor Study WebsiteAsset 4
Environmental AssessmentAsset 4
FliersAsset 4
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