Construction on Idaho State Highway 55 between Caldwell and Nampa will begin Aug. 8

ID 55 Construction

BOISE – Motorists can expect daytime lane restrictions, speed reductions and intermittent detours during construction this summer and fall.

The project includes repaving Idaho 55 between Pride Lane in Caldwell and Middleton Road in Nampa and improving the intersections at Farmway Road, Lake Avenue and Midway Road.

Each intersection will be widened to include five lanes on Idaho 55 and three lanes on local roads. ITD will install a new traffic signal at Farmway and Midway roads and replace the traffic signal at Lake Avenue.

“The best way to learn about traffic restrictions is to sign up for emails from ITD,” said ITD Construction Coordinator Merrill Sharp.  “The work schedule may change based on factors such as weather and utility work. We will send regular updates about what motorists can expect each week.”

ID55 Map 08_17

Map of construction zone for Idaho 55. Work begins Aug. 8.


During construction, lanes on ID-55 will be restricted during the day and the speed limit will be reduced. Traffic may be detoured around each intersection for several days.

The initial weeks of construction include widening the Farmway Road and Lake Avenue intersections and paving Idaho 55 between Pride Lane and Farmway Road.

“When complete, this project is expected to bring significant safety benefits for the 10,000 motorists who travel this stretch each day,” said Sharp. “While the road is under construction, however, we are asking motorists to plan ahead and expect delays.”

Construction details also will be posted to To sign up for updates, text IDAHO55 to 22828 or email