Bridge conditions in Fremont County, Idaho
138 inventoried bridges · 8 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Fremont County tracks close to typical: 8 of its 138 inventoried bridges (5.8%) are rated poor, against a national rate of about 7%.
- 8 of the 138 bridges in Fremont County, Idaho, are rated in poor condition (5.8%) in the 2025 National Bridge Inventory, as of .
- 45 bridges (32.6%) are rated good and 85 (61.6%) fair.
- The median Fremont County bridge was built in 1980.
- The busiest poor-rated bridge is Stc 6774;TETON Hwy over S.fk.teton River (built 1977), carrying about 1,100 vehicles a day.
Good 32.6% · Fair 61.6% · Poor 5.8% of 138 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 |
|---|---|---|---|
| Stc 6774;TETON Hwy over S.fk.teton River | 1977 | 1,100 | Poor |
| N 1600 E over St Anthony Canal | 1971 | 70 | Poor |
| 1300 N over Henrys Fk.snake R;fritz | 1967 | 50 | Poor |
| Fun Farm Road over Henrys Fk Snake River | 1925 | 30 | Poor |
| N 2700 E over Crosscut Canal | 1937 | 10 | Poor |
| N 4075 E over Marysville Canal | 1976 | 10 | Poor |
| US 20 Frontage Rd over N. Branch Fall River Cnl | 1932 | 10 | Poor |
| US 20 Frontage Rd over Fall River Overflow | 1932 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 Ebl & Wbl over Salem Union Canal | 1984 | 12,500 | Fair |
| US 20 over 2290 E | 1984 | 12,500 | Fair |
| US 20B over Henrys Fk. Snake River | 1965 | 11,500 | Fair |
| US 20B over Egin Canal | 1975 | 11,500 | Good |
| US 20 Wbl & Ebl over S.fk.fall River Canal | 1973 | 10,500 | Fair |
| US 20 Ebl & Wbl over Salem Union Canal | 1979 | 9,100 | Fair |
| US 20 Ebl & Wbl over Twin Groves Canal | 1979 | 9,100 | Fair |
| US 20 Ebl & Wbl over Farmers Friend Canal | 1979 | 9,100 | Fair |
| US 20 Wbl & Ebl over N.br.fall River Canal | 1979 | 9,100 | Good |
| US 20B;BRIDGE St over US 20;ST. Anthony Ic | 1984 | 8,300 | Good |
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.