Wibaux County Bridge Report Card
Wibaux County scores 83 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Wibaux County, Montana
Wibaux County has 25 bridges in the National Bridge Inventory, with 1 rated poor and 1 rated scour-critical. Its poor-condition share of 4.0% is at or below the 7.4% statewide average. Poor-condition bridges carry about 38 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Wibaux County a Bridge Condition Exposure Score of 83/100 (B). The county has 25 bridges in the National Bridge Inventory, including 1 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 38 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 | 4.0% | 8.0 |
| Poor-condition traffic exposure | 25 | 0.2% of measured traffic | 0.1 |
| Scour-critical bridge share | 20 | 4.0% | 8.0 |
| Average age vs national baseline | 10 | 50 years vs 48 nationally | 1.0 |
| Traffic-data completeness | 5 | 21,208 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 | 4.0% |
| State Poor-Condition Share | 7.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 4.0% |
| Average Bridge Age | 50 years |
| Poor-Condition Traffic Exposure | 38 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Wibaux County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Carlyle RD E over Beaver Creek | Poor condition + traffic exposure | Poor | 38 | 1960 |
| S 7 over Beaver Creek | Scour-critical foundation rating | Fair | 1,671 | 1949 |
| I 94 over Yates Creek | High traffic | Fair | 3,592 | 1962 |
| I 94 over Yates Creek | High traffic | Fair | 3,592 | 2000 |
| I 94 over Beaver Creek | High traffic | Fair | 1,796 | 1974 |
| I 94 over Int Carlyle RD | High traffic | Fair | 1,796 | 1974 |
| I 94 over Int Carlyle RD | High traffic | Fair | 1,796 | 1974 |
| I 94 over Beaver Creek | High traffic | Fair | 1,630 | 1962 |
| S7-2ndave NE over Beaver Creek | High traffic | Good | 1,066 | 2023 |
| S 7 over Beaver Creek | High traffic | Good | 714 | 2022 |
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.