ITD Plans Replacement of Ketchum's Big Wood River Bridge

The project involves replacing the aging and structurally deficient Big Wood River bridge.

Wed September 28, 2016 - West Edition #20
Construction Equipment Guide


Idaho Transportation Department 
The current bridge, built in 1956, is a three span structure with an overall length of 237 ft. (72 m) and is 32 ft. (9.75 m) wide.
Idaho Transportation Department The current bridge, built in 1956, is a three span structure with an overall length of 237 ft. (72 m) and is 32 ft. (9.75 m) wide.

The Idaho Transportation Department (ITD) is planning a replacement of the U.S. 20 Big Wood River Bridge in Blaine County. The bridge, locally known as Stanton Crossing, is located at milepost 176 about 2 mi. (3.2 km) west of the Idaho 75 (Timmerman) junction.

Project Background

The current bridge, built in 1956, is a three span structure with an overall length of 237 ft. (72 m) and is 32 ft. (9.75 m) wide.

The bridge is located adjacent to the Stanton Crossing campground managed by Idaho Department of Fish & Game. When constructed, the campground was originally known as Roadside Park built by ITD when the highway was State Highway 68. When highway was realigned and designated as U.S.-20, the Roadside Park remained in effect until construction of the Timmerman Rest Area. The Stanton Crossing site has a long history of recreational activities, such as camping and fishing.

Project Description

The project involves replacing the aging and structurally deficient Big Wood River bridge. The new structure will be wide enough to accommodate two 12-ft. (3.65 m) lanes and 6-ft. (1.8 m) shoulders. The bridge will be designed to best meet the requirements for a meandering river while still protecting the bridge.

The project will have temporary impacts to the campground, while having long-term improvements to the campground area.

The expected construction year is 2018.


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