Mahnomen County Bridge Report Card
Mahnomen County scores 89 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Mahnomen County, Minnesota
Mahnomen County has 40 bridges in the National Bridge Inventory, with 2 rated poor and 0 rated scour-critical. Its poor-condition share of 5.0% is above the 4.5% statewide average. Poor-condition bridges carry about 154 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Mahnomen County a Bridge Condition Exposure Score of 89/100 (B). The county has 40 bridges in the National Bridge Inventory, including 2 in poor condition and 0 rated scour-critical. Poor-condition bridges carry about 154 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 | 5.0% | 10.0 |
| Poor-condition traffic exposure | 25 | 1.2% of measured traffic | 0.9 |
| Scour-critical bridge share | 20 | 0.0% | 0.0 |
| Average age vs national baseline | 10 | 39 years vs 48 nationally | 0.0 |
| Traffic-data completeness | 5 | 12,442 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 | 5.0% |
| State Poor-Condition Share | 4.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 0.0% |
| Average Bridge Age | 39 years |
| Poor-Condition Traffic Exposure | 154 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Mahnomen County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Csah 5 over Wild Rice River | Poor condition + traffic exposure | Poor | 150 | 1966 |
| T 76 over Marsh Creek | Poor condition + traffic exposure | Poor | 4 | 1920 |
| US 59 over Wild Rice River | High traffic | Fair | 3,950 | 1979 |
| Mn 200 over Wild Rice River | High traffic | Good | 1,507 | 1973 |
| Mn 200 over Twin Lakes Creek | High traffic | Good | 1,213 | 2022 |
| Mn 113 over White Earth River | High traffic | Good | 1,093 | 1977 |
| Mn 200 over Marsh River | High traffic | Good | 849 | 2003 |
| Csah 10 over Wild Rice River | High traffic | Good | 670 | 2005 |
| Csah 25 over White Earth River | High traffic | Good | 435 | 1979 |
| Csah 25 over Wild Rice River | High traffic | Good | 435 | 1980 |
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.