Bridge conditions in Custer County, Montana
71 inventoried bridges · 6 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
6 of the 71 bridges the federal inventory lists in Custer County are rated poor; the rest split 11 good and 54 fair.
- 6 of the 71 bridges in Custer County, Montana, are rated in poor condition (8.5%) in the 2025 National Bridge Inventory, as of .
- 11 bridges (15.5%) are rated good and 54 (76.1%) fair.
- The median Custer County bridge was built in 1971.
- The busiest poor-rated bridge is Frntage Road 81020 over Cottonwood Creek 083 (built 1928), carrying about 507 vehicles a day.
Good 15.5% · Fair 76.1% · Poor 8.5% 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 |
|---|---|---|---|
| Frntage Road 81020 over Cottonwood Creek 083 | 1928 | 507 | Poor |
| Frntage Road 81020 over Miles Creek 037 | 1929 | 507 | Poor |
| Frntage Road 81020 over Macks Creek 038 | 1929 | 507 | Poor |
| Kircher Creek Rd over T and Y Canal 032 | 1938 | 100 | Poor |
| Frontage Road 205 over Cottonwood Creek 072 | 1929 | 100 | Poor |
| Frontage Road 205 over Snell Creek 073 | 1928 | 100 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 94 over Lignite Creek | 1964 | 4,724 | Fair |
| I 94 over Coal Creek | 1963 | 4,724 | Fair |
| I 94 over Tongue River | 1961 | 4,707 | Fair |
| I 94 over Vehicle Pass | 1986 | 4,697 | Good |
| I 94 over Jones Creek-stockpass | 1962 | 4,393 | Fair |
| S 59 over Yellowstone River | 1957 | 2,949 | Fair |
| US 94 over Tongue River | 2007 | 2,771 | Fair |
| I 94 over Tongue River | 1974 | 2,354 | Fair |
| I 94 over Sep Cemetery Rd | 1961 | 2,354 | Fair |
| I 94 over Int P-23 Broadus | 2019 | 2,349 | Good |
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.