Bridge conditions in Sanders County, Montana
120 inventoried bridges · 10 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 120 bridges in Sanders County: 45 rated good, 65 fair, and 10 poor.
- 10 of the 120 bridges in Sanders County, Montana, are rated in poor condition (8.3%) in the 2025 National Bridge Inventory, as of .
- 45 bridges (37.5%) are rated good and 65 (54.2%) fair.
- The median Sanders County bridge was built in 1978.
- The busiest poor-rated bridge is S 200 over Clark Fork River (built 1960), carrying about 2,482 vehicles a day.
Good 37.5% · Fair 54.2% · Poor 8.3% of 120 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 200 over Clark Fork River | 1960 | 2,482 | Poor |
| S 200 over RR | 1957 | 1,537 | Poor |
| S 56 Fh 5 over Bull River | 1960 | 692 | Poor |
| Irr - S 382 over RR | 1965 | 391 | Poor |
| Michel Creek Rd over Camas Creek 002 | 1978 | 100 | Poor |
| Lil Bitterroot Rd over Little Bitterroot Rv 070 | 1978 | 100 | Poor |
| Noxon Ave E over Cabinet Gorge Resv 047 | 1922 | 100 | Poor |
| No Data Entered over Rock CR | 1954 | 50 | Poor |
| No Data Entered over Vermilion River | 1959 | 50 | Poor |
| Irr Bia Rte 123 over South Fork Valley Creek | 1995 | 20 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S 200 over Clark Fork River | 1997 | 3,009 | Fair |
| S 200 over Clark Fork River | 1996 | 3,009 | Fair |
| S 200 over RR | 2000 | 2,686 | Good |
| S 200 over Clark Fork River | 1960 | 2,482 | Poor |
| Irr - S 28 over Hot Springs Creek | 1959 | 2,181 | Fair |
| S 200 over Wildlife Crossing | 2019 | 2,177 | Good |
| S 200 over Thompson River | 2015 | 2,177 | Good |
| Irr - S 200 over Seepay Creek | 1969 | 2,167 | Fair |
| S 200 over Clark Fork River | 1958 | 2,069 | Fair |
| S 200 over Beaver Creek | 1986 | 2,069 | 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.