Ketchum-Challis Highway Project

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Acrobat Icon Newsletter for November 2, 2017  (Acrobat, 656 KB)

Construction Photos

What is the project, and where is the work taking place?

This project concerns reconstruction of approximately 1.216 miles of Forest Highway 26, better known as State Highway 75 (SH 75). SH 75 gives travelers access to the heart of south-central Idaho, noted for its rugged and historic scenery and recreational activities. The roadway also provides one of a few east-west links across central Idaho. The Ketchum-Challis Highway runs along the Salmon River in the Sawtooth National Recreation Area (Sawtooth NRA), just south of the border between Sawtooth NRA and the Salmon-Challis National Forest. The project follows the existing alignment from approximately milepost (MP) 206.7 to approximately MP 207.9. The project area includes a reach of the Salmon River known locally as Pebble Beach.

Why is reconstruction needed?

Frequent rockfall from steep and unstable cut slopes above the roadway poses a safety hazard to motorists. Fill slope instabilities below the road have undermined and narrowed the roadway, creating variable and substandard pavement widths. These conditions create safety concerns for the users of SH 75, a key state highway that provides access between communities in Custer County and Blaine County. As a roadway administered under the Forest Highways Program, SH 75 must provide safe and adequate transportation access to and through National Forest System lands for visitors, recreationists, resource users, and others.

What reconstruction is occurring?

Road reconstruction includes widening the existing road, stabilizing slopes prone to rockfall, installing cross-drain culverts with riprap outlet protection, and performing the secondary activities needed to support these actions. FHWA is constructing two 11-foot lanes with 2-foot shoulders. Guardrails will be installed towards the Salmon River to protect motorists from the steep slopes. The frequent and dangerous rockfall will be addressed through flattening of the slopes to a more stable slope angle and stabilize the surface of the cut slopes to reduce erosion and help in the reestablishment of vegetation.

Project Map

Project Map  (JPG, 173 KB)

Documents and Updates

View a larger interactive map of the project area.

Project Details
Project # ID PFH 26(3)
Project Name Ketchum-Challis Highway (Pebble Beach Section)
Location Custer County, Sawtooth NRA, Sawtooth National Forest
Awarded to Ascorp, Inc, dba Debco Construction
Award Date June 13, 2016
Award Amount $5,107,888.77
View Tabulation of Bids
Status Completed

Contact Information

Federal Highway Administration
Western Federal Lands Highway Division
610 East Fifth Street
Vancouver, WA 98661-3801