Old US Hwy 93 over Dayton Creek 105
Lake County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Old US Hwy 93 over Dayton Creek 105 in Lake County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1930, making it 95 years old at the 2025 inventory.
- It carries about 100 vehicles a day (traffic count year 2025).
- Its listed owner is the state highway agency.
- It is one of 33 of the 116 inventoried bridges in Lake County rated fair (28.4%); 13 (11.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: substructure 6 to 5.
- Its most recent inspection on record is dated March 2024, on a 24-month routine inspection cycle.
- 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 → (47.86156, -114.28026)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 5 | Fair condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 63 ft |
| Location | Dayton |
| NBI structure number | L24742002+08501 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Lake County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Irr - US 93 over Pablo Feeder Canal | 2006 | 15,997 | Good |
| US 93 over Wildlife Crossing | 2007 | 10,897 | Good |
| US 93 over Wildlife Crossing | 2007 | 10,897 | Good |
| US 93 over Agricultural Crossing | 2007 | 10,897 | Good |
| Irr - US 93 over Jocko River | 2005 | 8,775 | Good |
| US 93 over Spring Creek | 2006 | 8,775 | Good |
All bridges nearby: Lake County, MT bridge conditions · every bridge in Lake County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.