Bridge conditions in Carter County, Montana
42 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 42 bridges in Carter County: 13 rated good, 27 fair, and 2 poor.
- 2 of the 42 bridges in Carter County, Montana, are rated in poor condition (4.8%) in the 2025 National Bridge Inventory, as of .
- 13 bridges (31.0%) are rated good and 27 (64.3%) fair.
- The median Carter County bridge was built in 1994.
- The busiest poor-rated bridge is S 7 over Drainage (built 1940), carrying about 473 vehicles a day.
Good 31.0% · Fair 64.3% · Poor 4.8% of 42 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 |
|---|---|---|---|
| S 7 over Drainage | 1940 | 473 | Poor |
| S 7 over Collins Creek | 1940 | 392 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 212 over Drainage | 1965 | 2,642 | Fair |
| US 212 over Thompson Creek | 1965 | 2,642 | Fair |
| US 212 over Little Missouri River | 1965 | 2,642 | Fair |
| US 212 over Willow Creek | 1955 | 2,285 | Fair |
| Chicago AVE over Russell Creek | 2019 | 480 | Good |
| Mormon Ave over Russell Creek 035 | 1940 | 480 | Fair |
| S 7 over Drainage | 1940 | 473 | Poor |
| S 7 over Flasted Draw | 1940 | 392 | Fair |
| S 7 over Little Beaver Creek | 2010 | 392 | Fair |
| S 7 over Collins Creek | 1940 | 392 | Poor |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Montana: Montana 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.