Bridge conditions in Twin Falls County, Idaho
126 inventoried bridges · 5 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
5 of the 126 bridges the federal inventory lists in Twin Falls County are rated poor; the rest split 14 good and 107 fair.
- 5 of the 126 bridges in Twin Falls County, Idaho, are rated in poor condition (4.0%) in the 2025 National Bridge Inventory, as of .
- 14 bridges (11.1%) are rated good and 107 (84.9%) fair.
- The median Twin Falls County bridge was built in 1969.
- The busiest poor-rated bridge is STC7232;BLUE Lakes over Rock Creek (built 1959), carrying about 11,500 vehicles a day.
Good 11.1% · Fair 84.9% · Poor 4.0% of 126 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| STC7232;BLUE Lakes over Rock Creek | 1959 | 11,500 | Poor |
| STC2714;3700 North over Rock Creek | 1973 | 6,000 | Poor |
| US 30 over Dry Creek | 1934 | 2,900 | Poor |
| US 30 over Uprr;bickel Overpass | 1936 | 2,500 | Poor |
| Shoestring Road over Snake River;sw Bliss Br | 1977 | 190 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 93 over Perrine Coulee;bike Path | 2006 | 33,000 | Fair |
| US 93 over Snake River; Perrine Br. | 1976 | 31,500 | Fair |
| SH 74 over Rock Creek | 1993 | 19,000 | Good |
| US 30 over Perrine Coulee Canal | 1960 | 15,500 | Fair |
| US 93 over Rock Creek | 2011 | 15,000 | Fair |
| STC7232;BLUE Lakes over Rock Creek | 1959 | 11,500 | Poor |
| US 30 over US 30/US 93 Interchange | 1997 | 11,000 | Fair |
| US 30 over S Coulee Canal | 1996 | 11,000 | Fair |
| SH 50 over Snake River;hansen Br. | 1966 | 9,200 | Fair |
| US 93 over Low Line Canal | 1994 | 7,300 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Idaho: Idaho bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.