Bridge conditions in Slope County, North Dakota
43 inventoried bridges · 0 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
None of the 43 inventoried bridges in Slope County are rated in poor condition in the current federal inventory. 36 are rated good and 7 fair.
- 0 of the 43 bridges in Slope County, North Dakota, are rated in poor condition (0.0%) in the 2025 National Bridge Inventory, as of .
- 36 bridges (83.7%) are rated good and 7 (16.3%) fair.
- The median Slope County bridge was built in 1988.
Good 83.7% · Fair 16.3% · Poor 0.0% of 43 bridges
Bridges rated poor
No bridges in this county carry a poor rating in the current inventory.
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US Highway 85 over Creek | 1991 | 1,080 | Good |
| US Highway 85 over Branch-cannonball River | 1963 | 1,010 | Good |
| US Highway 85 over Philbrick Creek | 1937 | 920 | Good |
| US Highway 12 over Little Missouri River | 1950 | 580 | Fair |
| US Highway 12 over Bnrr Separation | 1984 | 561 | Good |
| US Highway 12 over Little Beaver Creek | 1987 | 520 | Good |
| US Highway 12 over Branch of Beaver Creek | 1950 | 510 | Fair |
| Nd Highway 21 over Creek | 2021 | 507 | Good |
| Nd Highway 21 over Creek | 2021 | 507 | Good |
| Nd Highway 21 over Creek | 2021 | 507 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of North Dakota: North Dakota 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.