Teton County Bridge Report Card
Teton County scores 91 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Teton County, Montana
Teton County has 82 bridges in the National Bridge Inventory, with 3 rated poor and 0 rated scour-critical. Its poor-condition share of 3.7% is at or below the 7.4% statewide average. Poor-condition bridges carry about 300 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Teton County a Bridge Condition Exposure Score of 91/100 (A). The county has 82 bridges in the National Bridge Inventory, including 3 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 300 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 | 3.7% | 7.3 |
| Poor-condition traffic exposure | 25 | 1.1% of measured traffic | 0.8 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 50 years vs 48 nationally | 1.0 |
| Traffic-data completeness | 5 | 28,320 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 | 3.7% |
| State Poor-Condition Share | 7.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 50 years |
| Poor-Condition Traffic Exposure | 300 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Teton County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| 3rd LN NW over Muddy Creek 018 | Poor condition + traffic exposure | Poor | 100 | 1938 |
| 8th LN NE over Greenfield So Canal 039 | Poor condition + traffic exposure | Poor | 100 | 1966 |
| 6th LN NE over Drainage 129 | Poor condition + traffic exposure | Poor | 100 | 1974 |
| I 15 over Sep 9th RD NE | High traffic | Good | 1,969 | 1972 |
| I 15 over Sep 9th RD NE | High traffic | Good | 1,969 | 1972 |
| US 89 over Greenfields South Canal | High traffic | Good | 1,798 | 1983 |
| US 89 over Greenfields Main Canal | High traffic | Good | 1,798 | 1983 |
| I 15 over Int Main ST | High traffic | Fair | 1,703 | 1976 |
| I 15 over Int Main ST | High traffic | Fair | 1,703 | 1976 |
| I 15 over Teton River | High traffic | Fair | 1,703 | 1977 |
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.