Deer Lodge County Bridge Report Card
Deer Lodge County scores 83 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Deer Lodge County, Montana
Deer Lodge County has 67 bridges in the National Bridge Inventory, with 3 rated poor and 2 rated scour-critical. Its poor-condition share of 4.5% is at or below the 7.4% statewide average. Poor-condition bridges carry about 220 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Deer Lodge County a Bridge Condition Exposure Score of 83/100 (B). The county has 67 bridges in the National Bridge Inventory, including 3 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 220 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 | 4.5% | 9.0 |
| Poor-condition traffic exposure | 25 | 0.2% of measured traffic | 0.2 |
| Scour-critical bridge share | 20 | 3.0% | 6.0 |
| Average age vs national baseline | 10 | 52 years vs 48 nationally | 1.7 |
| Traffic-data completeness | 5 | 106,147 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 | 4.5% |
| State Poor-Condition Share | 7.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 3.0% |
| Average Bridge Age | 52 years |
| Poor-Condition Traffic Exposure | 220 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Deer Lodge County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Mt Evans Way over Warm Springs Creek 016 | Poor condition + traffic exposure | Poor | 100 | 1912 |
| County Road 098 over Clark Fork River 020 | Poor condition + traffic exposure | Poor | 100 | 1920 |
| No Data Entered over E Fk Fishtrap | Poor condition + traffic exposure | Poor | 20 | 1973 |
| Sycamore Street over Warm Springs Creek 009 | Scour-critical foundation rating | Fair | 283 | 1960 |
| I 90 over Lost Creek | High traffic | Fair | 11,628 | 1978 |
| I 90 over Willow Creek | High traffic | Fair | 10,417 | 1978 |
| I 90 over Int Galen | High traffic | Fair | 5,814 | 1978 |
| I 90 over Int Galen | High traffic | Good | 5,814 | 1978 |
| I 90 over Sep Perkins Lane | High traffic | Fair | 5,814 | 1978 |
| I 90 over Sep Huffman Lane | High traffic | Fair | 5,814 | 1978 |
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.