Bridge conditions in Beaverhead County, Montana
227 inventoried bridges · 24 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 227 Beaverhead County bridges in the federal inventory, 24 carry a poor rating. That 10.6% share is roughly 2x the national average.
- 24 of the 227 bridges in Beaverhead County, Montana, are rated in poor condition (10.6%) in the 2025 National Bridge Inventory, as of .
- 53 bridges (23.3%) are rated good and 150 (66.1%) fair.
- The median Beaverhead County bridge was built in 1980.
- The busiest poor-rated bridge is Hwy 91 N over Beaverhead River 033 (built 1946), carrying about 2,676 vehicles a day.
Good 23.3% · Fair 66.1% · Poor 10.6% of 227 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 |
|---|---|---|---|
| Hwy 91 N over Beaverhead River 033 | 1946 | 2,676 | Poor |
| I 15 over Int Lima-bailey St | 1959 | 1,863 | Poor |
| I 15 over Int Monida S 509 | 1959 | 1,771 | Poor |
| Mt Hwy 91 over RR | 1936 | 612 | Poor |
| Hwy 91 N over Big Hole River 041 | 1940 | 158 | Poor |
| Corinne Trail over Horse Prairie Creek 043 | 2022 | 100 | Poor |
| Upper N Fork Rd over N Fk Bighole River 064 | 1977 | 100 | Poor |
| Rock Creek Rd over Big Lake Creek 081 | 1958 | 100 | Poor |
| Big Swamp CR Rd / over Big Hole River 089 | 1925 | 100 | Poor |
| Miner Lake Rd over Governor Creek 092 | 1951 | 100 | Poor |
| Stibal Ln over Red Rock River 053 | 1975 | 100 | Poor |
| Brundage Ln over Red Rock River 052 | 1920 | 100 | Poor |
| Browns Bridge Rd over Big Hole River 123 | 1915 | 100 | Poor |
| Red Rock Rd over Limekiln Canyon 022 | 1931 | 60 | Poor |
| Canyon CR Road over Canyon CR | 1952 | 50 | Poor |
| Fdr 606 over Birch CR | 1954 | 40 | Poor |
| Fdr 945 over Ruby CR | 1968 | 20 | Poor |
| Fdr 624 over Ruby CR | 1952 | 20 | Poor |
| Fdr 1203 over Tie Creek | 1964 | 15 | Poor |
| Big Swamp CR Rd over Big Swamp CR | 1968 | 15 | Poor |
| Swamp CR Road over Big Swamp CR | 1968 | 15 | Poor |
| Ryan Canyon Rd over Beaverhead River 023 | 1908 | 14 | Poor |
| No Data Entered over Wise River | 1992 | 6 | Poor |
| Roe Ln over Red Rock River 121 | 1913 | 4 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S 89 over Local-blacktail Cr-rr | 1974 | 4,241 | Fair |
| S 89 over Int North Dillon I 15 | 1973 | 4,241 | Fair |
| I 15 over Drainage Irr Ditch | 1973 | 3,915 | Fair |
| I 15 over Birch Creek | 1973 | 3,852 | Fair |
| I 15 over Int Jackson-hwy 278 | 1982 | 2,863 | Fair |
| I 15 over Int Jackson-hwy 278 | 1982 | 2,863 | Good |
| I 15 over Beaverhead River | 1982 | 2,863 | Fair |
| I 15 over Beaverhead River | 1982 | 2,863 | Fair |
| I 15 over Poindexter Slough | 1983 | 2,863 | Fair |
| I 15 over Poindexter Slough | 1983 | 2,863 | 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.