Bridge conditions in Madison County, Montana
98 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
7 of the 98 bridges the federal inventory lists in Madison County are rated poor; the rest split 34 good and 57 fair.
- 7 of the 98 bridges in Madison County, Montana, are rated in poor condition (7.1%) in the 2025 National Bridge Inventory, as of .
- 34 bridges (34.7%) are rated good and 57 (58.2%) fair.
- The median Madison County bridge was built in 1987.
- The busiest poor-rated bridge is US 287 over South Willow Creek (built 1934), carrying about 4,102 vehicles a day.
Good 34.7% · Fair 58.2% · Poor 7.1% of 98 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 287 over South Willow Creek | 1934 | 4,102 | Poor |
| S 287 over Weber Irrigation Canal | 1950 | 2,300 | Poor |
| Jack Creek Rd over Jack Creek 028 | 1952 | 301 | Poor |
| Silver Spring Rd over Ruby River 023 | 1927 | 133 | Poor |
| Seyler Ln over Ruby River 019 | 1976 | 100 | Poor |
| Ruby Rd over Cottonwood CR | 1954 | 50 | Poor |
| No Data Entered over W Fk Madison River | 1947 | 50 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 287 over O`dell Creek | 2001 | 4,500 | Fair |
| US 287 over Madison River Overflow | 2001 | 4,500 | Good |
| US 287 over Madison River Overflow | 2001 | 4,500 | Good |
| US 287 over Madison River Overflow | 2001 | 4,500 | Good |
| US 287 over Madison River | 2001 | 4,500 | Fair |
| US 287 over South Willow Creek | 1934 | 4,102 | Poor |
| US 287 over Hot Springs Creek | 1997 | 3,900 | Good |
| Mt 41 over Beaverhead River | 1949 | 2,865 | Fair |
| S 84 over Cherry Creek | 1952 | 2,492 | Fair |
| S 41 over Beaverhead River | 1949 | 2,403 | 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.