Beaverhead County Bridge Report Card
Beaverhead County scores 70 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Beaverhead County, Montana
Beaverhead County has 227 bridges in the National Bridge Inventory, with 24 rated poor and 6 rated scour-critical. Its poor-condition share of 10.6% is above the 7.4% statewide average. Poor-condition bridges carry about 8,139 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Beaverhead County a Bridge Condition Exposure Score of 70/100 (C). The county has 227 bridges in the National Bridge Inventory, including 24 in poor condition and 6 rated scour-critical. Poor-condition bridges carry about 8,139 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 | 10.6% | 21.1 |
| Poor-condition traffic exposure | 25 | 4.4% of measured traffic | 3.3 |
| Scour-critical bridge share | 20 | 2.6% | 5.3 |
| Average age vs national baseline | 10 | 47 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 186,273 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 | 10.6% |
| State Poor-Condition Share | 7.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 2.6% |
| Average Bridge Age | 47 years |
| Poor-Condition Traffic Exposure | 8,139 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Beaverhead County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Browns Bridge RD over Big Hole River 123 | Poor condition + traffic exposure | Poor | 100 | 1915 |
| Rock Creek RD over Big Lake Creek 081 | Poor condition + traffic exposure | Poor | 100 | 1958 |
| Corinne Trail over Horse Prairie Creek 043 | Poor condition + traffic exposure | Poor | 100 | 2022 |
| No Data Entered over Wise River | Poor condition + traffic exposure | Poor | 6 | 1992 |
| HWY 91 N over Beaverhead River 033 | Poor condition + traffic exposure | Poor | 2,676 | 1946 |
| I 15 over Int Lima-bailey ST | Poor condition + traffic exposure | Poor | 1,863 | 1959 |
| I 15 over Int Monida S 509 | Poor condition + traffic exposure | Poor | 1,771 | 1959 |
| Mt HWY 91 over Rr | Poor condition + traffic exposure | Poor | 612 | 1936 |
| HWY 91 N over Big Hole River 041 | Poor condition + traffic exposure | Poor | 158 | 1940 |
| Brundage LN over Red Rock River 052 | Poor condition + traffic exposure | Poor | 100 | 1920 |
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.