Bridge conditions in Rosebud County, Montana
112 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
7 of the 112 bridges the federal inventory lists in Rosebud County are rated poor; the rest split 18 good and 87 fair.
- 7 of the 112 bridges in Rosebud County, Montana, are rated in poor condition (6.2%) in the 2025 National Bridge Inventory, as of .
- 18 bridges (16.1%) are rated good and 87 (77.7%) fair.
- The median Rosebud County bridge was built in 1972.
- The busiest poor-rated bridge is US 12 over Drainage (built 1947), carrying about 222 vehicles a day.
Good 16.1% · Fair 77.7% · Poor 6.2% of 112 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 |
|---|---|---|---|
| US 12 over Drainage | 1947 | 222 | Poor |
| US 12 over Drainage | 1941 | 222 | Poor |
| US 12 over Drainage | 1938 | 214 | Poor |
| Old Hwy 10 over Sweeney Creek 064 | 1930 | 128 | Poor |
| Frontage Road 303 over Graveyard Creek 055 | 1928 | 128 | Poor |
| County Road 105 over W Blacktail Creek 007 | 1940 | 100 | Poor |
| Wendel Kincheloe R over Rattlesnake Creek 002 | 1950 | 100 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr Bia Rte 6 over Lame Deer Creek | 1976 | 3,000 | Good |
| I 94 over Int East Forsyth | 1977 | 2,749 | Fair |
| I 94 over Int East Forsyth | 1977 | 2,749 | Fair |
| I 94 over Int W Rosebud 446-447 | 1970 | 2,636 | Fair |
| I 94 over Int W Rosebud 446-447 | 1970 | 2,636 | Fair |
| I 94 over Rosebud Creek | 1970 | 2,636 | Fair |
| I 94 over Rosebud Creek | 1970 | 2,636 | Fair |
| I 94 over Sep Wright Ln | 1970 | 2,636 | Fair |
| I 94 over Sweeney Creek-co Rd | 1970 | 2,636 | Fair |
| I 94 over Sweeney Creek-co Rd | 1970 | 2,636 | Fair |
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.