Work on US-12 improvements in Lewiston begins in March; open house Feb. 28

Vehicles move through the US-12 and 21st Street intersection, which is set for reconstruction in 2019.

The Idaho Transportation Department invites the public to attend an open house on Feb. 28 about upcoming improvements to the US-12 and 21st Street intersection.

The open house will be held from 4 to 7 p.m. at the Red Lion Hotel in Lewiston (621 21st St.). Attendees will have an opportunity to view construction phasing and detours for work that is scheduled to begin in March and last through October.

Construction will improve safety and traffic flow at the busiest intersection in Central Idaho by creating a more standard intersection. View the full list of changes.

The intersection will remain closed for the season, with the following detours in place:

  • East of the intersection, drivers may use 24th Street to go south on 21st Street or 26th Street to go north on 21st Street to and from East Main Street. During construction, both streets will be converted to one-way streets.
  • West of the intersection, drivers may use 18th Street and Idaho Street to head north and south on 21st Street to US-12.

Through traffic on US-12 will not be detoured but will be reduced to one lane in each direction. A temporary signal will be installed at East Main Street and the highway to allow drivers to directly travel east on US-12 or Main Street.

Crews will typically be on site throughout the week during the day, but work is allowed on weekends. Visitors to Locomotive Park can expect short closures during the first phase of construction as city stormwater improvements are installed.

Interested members of the public may sign up for an e-newsletter by visiting the project website.