Twin Falls County Bridge Report Card
Twin Falls County scores 76 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Twin Falls County, Idaho
Twin Falls County has 126 bridges in the National Bridge Inventory, with 5 rated poor and 5 rated scour-critical. Its poor-condition share of 4.0% is at or below the 5.4% statewide average. Poor-condition bridges carry about 23,090 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Twin Falls County a Bridge Condition Exposure Score of 76/100 (C). The county has 126 bridges in the National Bridge Inventory, including 5 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 23,090 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 4.0% | 7.9 |
| Poor-condition traffic exposure | 25 | 8.8% of measured traffic | 6.6 |
| Scour-critical bridge share | 20 | 4.0% | 7.9 |
| Average age vs national baseline | 10 | 53 years vs 48 nationally | 1.9 |
| Traffic-data completeness | 5 | 262,287 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 4.0% |
| State Poor-Condition Share | 5.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 4.0% |
| Average Bridge Age | 53 years |
| Poor-Condition Traffic Exposure | 23,090 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Twin Falls County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Shoestring Road over Snake River;sw Bliss Br | Poor condition + traffic exposure | Poor | 190 | 1977 |
| Stc7232;blue Lakes over Rock Creek | Poor condition + traffic exposure | Poor | 11,500 | 1959 |
| Stc2714;3700 North over Rock Creek | Poor condition + traffic exposure | Poor | 6,000 | 1973 |
| US 30 over Dry Creek | Poor condition + traffic exposure | Poor | 2,900 | 1934 |
| US 30 over Uprr;bickel Overpass | Poor condition + traffic exposure | Poor | 2,500 | 1936 |
| SH 46 over Snake River;ken Curtis | Scour-critical foundation rating | Fair | 4,700 | 1968 |
| Stc2715;4100 N. RD over Cedar Draw | Scour-critical foundation rating | Fair | 2,700 | 1932 |
| River Road over Salmon Falls Creek | Scour-critical foundation rating | Fair | 30 | 1921 |
| 4248: Shoshone Cre over Shoshone Creek | Scour-critical foundation rating | Good | 25 | 1985 |
| US 93 over Perrine Coulee;bike Path | High traffic | Fair | 33,000 | 2006 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.