Idaho Transportation Department rendering

A map of the roadwork projects this year on State Highway 55 in Idaho.

Construction season is kicking off on State Highway 55, a vital link in the north-south corridor connecting Boise and Lewiston.

With Idaho's short summer construction window and the need for warm temperatures before snowfall returns, the Idaho Transportation Department (ITD) is working on several key projects along SH 55 to maintain and improve the critical route.

Each project is part of the department's continued commitment to enhance safety and mobility along this essential route. From bridge replacements to essential maintenance, these efforts are designed to keep Idahoans moving safely and efficiently throughout the region for many years ahead.

North on the map from Eagle to New Meadows, are projects this construction season:

Horseshoe Bend to Boise National Forest Boundary Chip Seal (Construction: summer 2025) ITD will apply a chip seal to SH 55 between Horseshoe Bend and the Boise National Forest Boundary to extend the life of the pavement.

Fleming Creek Bridge Replacement (Construction: fall 2024 — late 2025) ITD is replacing the Fleming Creek Bridge on SH-55 approximately 4 mi. south of Banks. The project includes a minor realignment of SH-55 to accommodate the bridge and meet current standards for roadway geometry.

Banks-Lowman Road Intersection Interim Traffic Signal (Construction: spring 2025) The new signal was activated May 5 and replaces flagging operations that had previously occurred during peak travel periods, providing a safer and more efficient solution for travelers.

Rainbow Bridge Maintenance (Construction: spring — fall 2025) ITD will repair concrete bridge elements, replace expansion joints and repair the deck surface. This maintenance is necessary to continue meeting safety and capacity standards until a new bridge is constructed in the future.

Dynamic Message Sign (Construction: summer 2025) ITD is installing a dynamic message sign on SH 55 this summer between Round Valley and Cascade. The new message board will notify motorists of detours or incidents.

Little Goose Creek Bridge (Construction: June 2024 — fall 2025) ITD is replacing the Little Goose Creek Bridge along SH 55 near New Meadows. This project has been extended due to weather, road conditions and unexpected contractor delays. Work will be completed this fall.

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