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Bridge Replacements on US-20 in Camas and Blaine Counties Have Begun

SHOSHONE, ID — The Idaho Transportation Department (ITD) recently began work on two bridge construction projects along US-20. The new crossings will be located over Willow Creek in Camas County (MP 164) and Rock Creek in Blaine County (MP 173).
During construction, ITD will remove aging culverts and surrounding earthwork at both locations and construct new crossings over the waterways.  
“Due to age and corrosion of the pipelines, both culverts are in need of replacement,” said ITD Project Manager Brock Dillé. “We analyzed multiple options regarding these crossings before determining that bridge designs would have the best long-term value for both Willow Creek and Rock Creek.”
The structure spanning Willow Creek will be a 170-foot steel girder bridge while the structure spanning Rock Creek will be a 159-foot concrete girder bridge. As an added result of the forthcoming bridge structures, ITD will also be able to restore the streams to a more natural condition, which in turn should have a positive effect on the surrounding ecosystem.
Construction on the crossings will occur simultaneously. Each work zone is anticipated to encompass one mile with approximately seven miles between each site. Work is expected to last through December. Knife River is the contractor for both projects.
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