Bridge conditions in Mercer County, North Dakota
71 inventoried bridges · 4 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
4 of the 71 bridges the federal inventory lists in Mercer County are rated poor; the rest split 24 good and 43 fair.
- 4 of the 71 bridges in Mercer County, North Dakota, are rated in poor condition (5.6%) in the 2025 National Bridge Inventory, as of .
- 24 bridges (33.8%) are rated good and 43 (60.6%) fair.
- The median Mercer County bridge was built in 1979.
- The busiest poor-rated bridge is Nd Highway 200 over Branch of Raymond Creek (built 1950), carrying about 780 vehicles a day.
Good 33.8% · Fair 60.6% · Poor 5.6% of 71 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 |
|---|---|---|---|
| Nd Highway 200 over Branch of Raymond Creek | 1950 | 780 | Poor |
| Irr Bia Rte 22 over Trib to Red Butte Bay | 1960 | 200 | Poor |
| CR20 over Brady Creek | 1984 | 50 | Poor |
| 65th Ave SW over Spring Creek | 1969 | 26 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Nd Highway 49 over Creek | 1967 | 3,730 | Fair |
| Nd Highway 49 over Knife River | 2016 | 3,400 | Good |
| Nd Highway 49 over Coyote Creek | 2016 | 2,745 | Good |
| Nd Highway 49 over Brush Creek | 2016 | 2,745 | Good |
| Nd Highway 200 over Knife River Overflow | 1952 | 2,300 | Fair |
| Nd Highway 200 over Knife River | 1966 | 2,280 | Fair |
| Nd Highway 200 over Kineman Creek | 1966 | 2,030 | Good |
| Nd Highway 49 over Knife River Coal Road | 1963 | 1,590 | Good |
| Nd Highway 200 over Creek | 1966 | 1,430 | Fair |
| Nd Highway 200 over Alderin Creek | 1970 | 1,120 | Fair |
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.