SH-16 Construction

Overview

Construction is underway throughout the State Highway 16 corridor. Follow this website for updates about ITD’s work in each location. Upon completion of the entire corridor in 2027, this limited-access highway extension will run north to south between SH-44 and I-84.

US-26 & 25th East Hitt Road current intersection in Idaho Falls including signal lights and traffic

The Idaho Transportation Department is constructing the extension of State Highway 16.

SH-16 will improve regional mobility, provide access to I-84 in the rapidly growing central Treasure Valley, and improve commutes for thousands of motorists. Upon completion, this limited-access highway extension will run from north to south between SH-44 and I-84.

The entire corridor is on track to open in 2027.

SIGN UP FOR CONSTRUCTION UPDATES

Email: sh16@itd.idaho.gov

Call: 208-334-8008

Text: HIGHWAY16 to 1-866-483-8422

PROJECT OVERVIEW

The SH-16 extension will be a limited-access highway. Access on and off the highway will be limited to a few major locations. This will allow traffic on SH-16 to continue moving without encountering numerous driveways and side streets, greatly improving traffic flow.

CURRENT WORK

ITD is building a new highway with two lanes in both directions, a center median barrier and 10-foot shoulders. The highway will be elevated between 5 and 20 feet off the ground. Motorists will use freeway interchanges to enter or exit SH-16 at I-84, Franklin Road, Ustick Road, US-20/26 and SH-44.

Westbound I-84 Closures between Garrity (Exit 38) and Ten Mile (Exit 42) Interchanges

WHAT TO EXPECT: Thursday, Jan. 22 and Monday, Jan. 26

Westbound I-84 will be fully closed between Garrity (Exit 38) and Ten Mile (Exit 42) interchanges.
Closures will take place each night from 10 p.m. to 6 a.m.

Anticipated Construction Impacts

Occasional closures or delays on roads in the project area.
Some work will be scheduled at night and will require nighttime noise and lighting.
Vehicle traffic will increase in the area during construction.
Work will be noisy at times.
Access to businesses, residential areas and irrigation will remain open.
Flaggers will direct traffic through the work zone when necessary.
Utility companies may interrupt traffic when relocating infrastructure.

Click the buttons below for more information on each interchange

Funding

Current construction is funded in part with Transportation Expansion and Congestion Mitigation (TECM) funds as part of Governor Little’s Leading Idaho TECM Program. The program allows ITD to accelerate project timelines to address rapid growth and build critical infrastructure today that would otherwise take many years to fund and build.

Other projects in the area

State Highway 16 is one of many infrastructure projects in the central Treasure Valley. ITD and other agencies are working together to meet the needs of this growing area.

Click the map to find more information about nearby construction projects, or contact your local agency below:

Ada County Highway District:
- Ustick Road widening (east of SH-16) or achdidaho.org/connect
City of Meridian:
- Can-Ada Lift Station (McMillan Road) or (208) 898-5500
City of Nampa:
- Ustick Road widening (west of SH-16) or (208) 465-2221

Timeline

The entire corridor is expected to open in 2027.

2006-2011

ITD completed an Environmental Impact Statement for SH-16, including an interchange at SH-44.
2012-2014

ITD constructed the first 2.5 miles from SH-44 to US-20/26.
2017-2019

ITD refined the design for the remaining 5 miles, updated the EIS and reduced the highway footprint.
2020-2021

ITD completed final design of the current construction (SH-16 mainline).
2022-2023

Construction began between I-84 and US-20/26.
2021-2024

ITD developed final design plans for future interchanges.
2025-2027

ITD is accelerating completion of full interchanges along the corridor. The entire corridor is expected to open in 2027.