Bridge conditions in Grant County, North Dakota
59 inventoried bridges · 6 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Of the 59 Grant County bridges in the federal inventory, 6 carry a poor rating. That 10.2% share is roughly 2x the national average.
- 6 of the 59 bridges in Grant County, North Dakota, are rated in poor condition (10.2%) in the 2025 National Bridge Inventory, as of .
- 23 bridges (39.0%) are rated good and 30 (50.8%) fair.
- The median Grant County bridge was built in 1965.
- The busiest poor-rated bridge is 49th St SW over Peters Creek (built 1932), carrying about 20 vehicles a day.
Good 39.0% · Fair 50.8% · Poor 10.2% of 59 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 |
|---|---|---|---|
| 49th St SW over Peters Creek | 1932 | 20 | Poor |
| 72ND Ave SW over Cannonball River | 1944 | 20 | Poor |
| 52nd Avenue over Heart River | 1927 | 20 | Poor |
| Irrsr County Hiway over Ceder Creek | 1940 | 20 | Poor |
| 64th St SW over Antelope Creek | 1967 | 10 | Poor |
| 45TH Avenue SW over Creek | 1942 | 10 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Nd Highway over Creek | 1950 | 950 | Fair |
| Nd Highway over Branch-antelope Creek | 1952 | 700 | Fair |
| Nd Highway 21 over Creek | 1994 | 590 | Fair |
| Nd Highway 49 over Antelope Creek | 1988 | 580 | Good |
| Nd Highway 31 over Dogtooth Creek | 2024 | 420 | Good |
| Nd Highway 49 over Cannonball River | 1970 | 420 | Fair |
| Nd Highway 49 over Creek | 1970 | 380 | Good |
| Nd Highway 49 over Creek | 1970 | 340 | Good |
| Irrsr Nd Hiway 31 over Cannonball River | 2014 | 260 | Good |
| Irrsr Nd Hiway 49 over Timber Creek | 1972 | 250 | 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.