The Idaho Transportation Department is continuing to invest in the Idaho 16 corridor to meet the long-term needs of the growing Treasure Valley.Learn More
Regional growth: Rapid development in the western Treasure Valley is increasing travel demand on Idaho highways and surrounding regional roadways.
Regional mobility and circulation: Current north-south routes connecting I-84 and Idaho 44 (State St.) are not adequate to meet future demands.
Congestion on north-south arterials: The limited number of river crossings between Idaho 44 and I-84 increases congestion on the surrounding roadways.
The extension of Idaho 16 from I-84 to Idaho 44 will be a 7.49-mile limited-access expressway. Interchanges at Franklin Road, Ustick Road, U.S. 20/26 and Idaho 44 will provide motorists access to Idaho 16. A network of local roads will provide access to and from local neighborhoods and businesses.
Click here to view a map of the EIS preferred alternative
In 2011, ITD completed an environmental study to extend the corridor south to connect with I-84. The study resulted in an approved route for the highway extension. Construction of the first two-mile segment was completed in 2014, which included a new bridge crossing the Boise River.
In December 2017, the Idaho Transportation Board approved additional funding to refine the corridor's design between I-84 and U.S. 20/26 (Chinden Blvd.).
This funding allows ITD to:
• Update traffic projections.
• Review recent developments and update property information.
• Update right-of-way and construction cost estimates.
• Develop construction phasing options.
• Refine elements of the 2011 environmental study.
• Advance design efforts to be ready for future funding.
• Develop right-of-way plans.
This work enables ITD to identify the funds needed to secure right-of-way and construct Idaho 16 from I-84 to U.S. 20/26, including the interchanges at Idaho 44 and U.S. 20/26, Ustick Road, and Franklin Road.
In December 2018 the Idaho Transportation Board approved the reallocation of $90.24 million to the Idaho 16 corridor. These funds will allow ITD to begin preserving some of the corridor right-of-way.
In 2019, ITD will advance and refine the corridor’s design. This will allow the process of acquiring right-of-way to begin. Opportunities for constructing the corridor in phases will also be explored.