Bridge conditions in Petroleum County, Montana
26 inventoried bridges · 4 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Petroleum 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 Petroleum 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 Petroleum County bridge was built in 1963.
- The busiest poor-rated bridge is S 244 over Yellow Water Cr-elk CR (built 1948), carrying about 233 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 |
|---|---|---|---|
| S 244 over Yellow Water Cr-elk CR | 1948 | 233 | Poor |
| Hughes Ln over Flatwillow Creek 016 | 1950 | 100 | Poor |
| Old Cat Creek Rd over Box Elder Creek 008 | 1930 | 100 | Poor |
| Road 317 over Drag Creek | 1963 | 2 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S 200 over Box Elder Creek | 1953 | 539 | Fair |
| S 244 over Mcdonald Creek | 1941 | 245 | Fair |
| S 244 over Pike Creek | 1939 | 233 | Fair |
| S 244 over Drainage | 1935 | 233 | Fair |
| S 244 over Yellow Water Cr-elk CR | 1948 | 233 | Poor |
| S 244 over Drainage | 1940 | 208 | Fair |
| S 244 over Flatwillow Creek | 1939 | 208 | Fair |
| Horse Camp Road over Sacagawea River | 2015 | 100 | Good |
| Flatwillow Road over Flatwilow Creek | 2023 | 100 | Good |
| Petrolia Lake Rd over Mcdonald Creek 014 | 1980 | 100 | 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.