Bridge conditions in Powell County, Montana
113 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Powell County tracks close to typical: 7 of its 113 inventoried bridges (6.2%) are rated poor, against a national rate of about 7%.
- 7 of the 113 bridges in Powell County, Montana, are rated in poor condition (6.2%) in the 2025 National Bridge Inventory, as of .
- 36 bridges (31.9%) are rated good and 70 (61.9%) fair.
- The median Powell County bridge was built in 1979.
- The busiest poor-rated bridge is I 90 EB over RR (built 1973), carrying about 5,992 vehicles a day.
Good 31.9% · Fair 61.9% · Poor 6.2% of 113 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 |
|---|---|---|---|
| I 90 EB over RR | 1973 | 5,992 | Poor |
| I 90 over RR | 1973 | 5,992 | Poor |
| I 90 over Int W Garrison-rr | 1979 | 5,232 | Poor |
| Main St over Clark Fork River | 1949 | 2,330 | Poor |
| S 141 over Nevada Creek | 1936 | 1,594 | Poor |
| S Frontage Rd 011 over Dempsey Creek 059 | 1930 | 916 | Poor |
| Chokecherry Ln over Little Blackfoot R 027 | 1914 | 19 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Dempsey Creek | 1973 | 10,708 | Fair |
| I 90 over Jr Grade Sep | 1961 | 10,463 | Fair |
| I 90 over Jr Grade Sep | 1961 | 10,463 | Fair |
| I 90 over Int Jens | 1959 | 5,992 | Fair |
| I 90 over Int Jens | 1959 | 5,992 | Fair |
| I 90 EB over Int Gold Creek | 1959 | 5,992 | Fair |
| I 90 WB over Int Gold Creek | 1959 | 5,992 | Fair |
| I 90 EB over RR | 1973 | 5,992 | Poor |
| I 90 over RR | 1973 | 5,992 | Poor |
| I 90 over Clark Fork River | 1961 | 5,354 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Montana: Montana 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.