Lost Trail Road over Canyon Creek
Yellowstone County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Lost Trail Road over Canyon Creek in Yellowstone County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 2020, making it 5 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2025).
- Its listed owner is the county highway agency.
- It is one of 97 of the 290 inventoried bridges in Yellowstone County rated good (33.4%); 7 (2.4%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (45.78847, -108.87536)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 8 | Very good condition |
| Superstructure | 7 | Good condition |
| Substructure | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete tee beam |
| Length | about 44 ft |
| Location | 10.2 Miles NW Laurel |
| NBI structure number | 000000202008013 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Yellowstone County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I90 over MT Power RR Spur | 2023 | 29,488 | Good |
| I 90 over City County Drain Ditch | 1966 | 27,985 | Fair |
| King Ave W over Bbwa Canal | 1994 | 26,602 | Fair |
| Mullowney Ln over RR | 2007 | 23,980 | Good |
| Mullowney Ln over RR | 2007 | 23,980 | Fair |
| US 87 over Int Lockwood I 90 | 1966 | 23,199 | Fair |
All bridges nearby: Yellowstone County, MT bridge conditions · every bridge in Yellowstone County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.