Bridge conditions in Mahnomen County, Minnesota
40 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 40 bridges in Mahnomen County: 27 rated good, 11 fair, and 2 poor.
- 2 of the 40 bridges in Mahnomen County, Minnesota, are rated in poor condition (5.0%) in the 2025 National Bridge Inventory, as of .
- 27 bridges (67.5%) are rated good and 11 (27.5%) fair.
- The median Mahnomen County bridge was built in 1985.
- The busiest poor-rated bridge is Csah 5 over Wild Rice River (built 1966), carrying about 150 vehicles a day.
Good 67.5% · Fair 27.5% · Poor 5.0% of 40 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Csah 5 over Wild Rice River | 1966 | 150 | Poor |
| T 76 over Marsh Creek | 1920 | 4 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 59 over Wild Rice River | 1979 | 3,950 | Fair |
| Mn 200 over Wild Rice River | 1973 | 1,507 | Good |
| Mn 200 over Twin Lakes Creek | 2022 | 1,213 | Good |
| Mn 113 over White Earth River | 1977 | 1,093 | Good |
| Mn 200 over Marsh River | 2003 | 849 | Good |
| Csah 10 over Wild Rice River | 2005 | 670 | Good |
| Csah 25 over Wild Rice River | 1980 | 435 | Good |
| Csah 25 over White Earth River | 1979 | 435 | Good |
| Csah 6 over White Earth River | 1991 | 355 | Good |
| Csah 11 over White Earth River | 1966 | 335 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Minnesota: Minnesota bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.