Frontage Road 018 over Irrigation Ditch 001
Treasure County, Montana · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Frontage Road 018 over Irrigation Ditch 001 in Treasure County, Montana, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1933 and reconstructed in 1955, making it 92 years old at the 2025 inventory.
- It carries about 281 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 4 of the 26 inventoried bridges in Treasure County rated poor (15.4%); 4 (15.4%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated September 2023, on a 24-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (46.29444, -107.21646)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 25 ft |
| Location | 1M E Hysham |
| NBI structure number | L52086000+05001 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | September 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Treasure County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 94 over Sep RR | 1973 | 5,042 | Good |
| I 94 over Int Hysham | 1964 | 2,521 | Good |
| I 94 over Int Hysham | 1976 | 2,521 | Good |
| I 94 over Sarpy Creek | 1967 | 2,521 | Good |
| I 94 over Sarpy Creek | 1976 | 2,094 | Good |
| Old Hwy 10 over Irrigation Ditch 024 | 1933 | 273 | Fair |
All bridges nearby: Treasure County, MT bridge conditions · every bridge in Treasure County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.