S 5 over Marron Creek
Sheridan County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- S 5 over Marron Creek in Sheridan County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1983, making it 42 years old at the 2025 inventory.
- It carries about 1,559 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 52 of the 66 inventoried bridges in Sheridan County rated fair (78.8%); 3 (4.5%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (48.76633, -104.52558)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 5 | Fair condition |
Bridge details
| Structure | Steel culvert |
| Length | about 25 ft |
| Location | 1M E Plentywood |
| NBI structure number | P00022043+03681 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Sheridan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| S 16 over Ator Creek | 1984 | 1,559 | Fair |
| S 5 over Antelope Creek | 1986 | 1,120 | Good |
| S 16 over Medicine Lake | 1975 | 891 | Fair |
| S 5 over Plentywood Creek | 2001 | 589 | Good |
| S 5 over Mccoy Creek | 2001 | 589 | Good |
| S 5 over Redstone Creek | 2011 | 511 | Good |
All bridges nearby: Sheridan County, MT bridge conditions · every bridge in Sheridan County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.