Bridge conditions in Blaine County, Montana
102 inventoried bridges · 10 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
10 of the 102 bridges the federal inventory lists in Blaine County are rated poor; the rest split 35 good and 57 fair.
- 10 of the 102 bridges in Blaine County, Montana, are rated in poor condition (9.8%) in the 2025 National Bridge Inventory, as of .
- 35 bridges (34.3%) are rated good and 57 (55.9%) fair.
- The median Blaine County bridge was built in 1959.
- The busiest poor-rated bridge is Irr - US 2 over Milk River (built 1964), carrying about 3,311 vehicles a day.
Good 34.3% · Fair 55.9% · Poor 9.8% of 102 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 |
|---|---|---|---|
| Irr - US 2 over Milk River | 1964 | 3,311 | Poor |
| US 2 over Lodge Creek | 1942 | 2,335 | Poor |
| US 2 over Irrigation-stockpass | 1940 | 2,335 | Poor |
| US 2 over Drainage | 1940 | 2,141 | Poor |
| US 2 over Drainage | 1940 | 2,141 | Poor |
| S 529-clear CR Rd over Milk River | 1967 | 256 | Poor |
| Redrock Rd over Fort Belknap Canal 008 | 1933 | 212 | Poor |
| Ekegren Rd over Thirty Mile Creek 097 | 1938 | 100 | Poor |
| Middle Rd over Battle Creek 056 | 1920 | 100 | Poor |
| Lodge Creek Rd over Fort Belknap Canal | 1952 | 100 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 2 over Main Irrigation Canal | 1968 | 3,311 | Good |
| Irr - US 2 over Milk River | 1964 | 3,311 | Poor |
| US 2 over Red Rock Creek Overflow | 1942 | 2,919 | Fair |
| US 2 over Drainage | 1942 | 2,919 | Fair |
| US 2 over Red Rock West Overflow | 2020 | 2,732 | Good |
| US 2 over Red Rock Coulee | 2020 | 2,732 | Good |
| US 2 over Red Rock East Overflow | 2020 | 2,732 | Good |
| US 2 over Milk River | 2004 | 2,655 | Fair |
| US 2 over Clear Creek | 2020 | 2,346 | Good |
| US 2 over Lodge Creek | 1942 | 2,335 | 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.