Bridge conditions in Treasure County, Montana
26 inventoried bridges · 4 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Treasure County has 4 bridges rated poor out of 26 inventoried, a 15.4% share that puts it well above the national rate of about 7%.
- 4 of the 26 bridges in Treasure County, Montana, are rated in poor condition (15.4%) in the 2025 National Bridge Inventory, as of .
- 8 bridges (30.8%) are rated good and 14 (53.8%) fair.
- The median Treasure County bridge was built in 1970.
- The busiest poor-rated bridge is Frontage Road 018 over Irrigation Ditch 001 (built 1933), carrying about 281 vehicles a day.
Good 30.8% · Fair 53.8% · Poor 15.4% of 26 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 |
|---|---|---|---|
| Frontage Road 018 over Irrigation Ditch 001 | 1933 | 281 | Poor |
| Frontage Road 018 over Drainage 009 | 1933 | 219 | Poor |
| Frontage Rd over Sarpy Creek 003 | 1925 | 28 | Poor |
| River Rd over Irrigation Ditch 005 | 1979 | 17 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 94 over Sep RR | 1973 | 5,042 | Good |
| I 94 over Int Hysham | 1964 | 2,521 | Good |
| I 94 over Int Hysham | 1976 | 2,521 | Good |
| I 94 over Sarpy Creek | 1967 | 2,521 | Good |
| I 94 over Sarpy Creek | 1976 | 2,094 | Good |
| Frontage Road 018 over Irrigation Ditch 001 | 1933 | 281 | Poor |
| Old Hwy 10 over Irrigation Ditch 024 | 1933 | 273 | Fair |
| Frontage Road 018 over Drainage 009 | 1933 | 219 | Poor |
| Frontage Road 018 over Drainage 010 | 1933 | 219 | Fair |
| Old Hwy 10 over Sarpy Creek 014 | 2015 | 219 | 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.