Rock Creek Bridge, Shoshone Street West spanning Rock Creek, Twin Falls, Twin Falls County, ID

Significance: The Rock Creek Bridge is exceptionally unique as one of only two viaduct-type highway bridges in the Idaho State Bridge Inventory. / In a historical context, the structure reflects the vast improvements in steel bridge technology which made timber bridge construction obsolete. Significantly enough, Twin Falls County records indicate that several of the old wood trestle bridges spanning Rock Creek were replaced with steel structures during the decade, 1910-1920.
Survey number: HAER ID-21
Building/structure dates: 1920 Initial Construction
Building/structure dates: 1954 Subsequent Work
Building/structure dates: 1992 Demolished