Ismay Rd over Cottonwood Creek
Fallon County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ismay Rd over Cottonwood Creek in Fallon County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2023, making it 2 years old at the 2025 inventory.
- It carries about 38 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 17 of the 38 inventoried bridges in Fallon County rated good (44.7%); 2 (5.3%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2023, on a 24-month routine inspection cycle.
- 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 → (46.4566, -104.7886)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 8 | 8 | Very good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 47 ft |
| Location | 3.9M S Ismay |
| NBI structure number | 000000202206646 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 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 Fallon County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Lake St over Baker Lake Overflow | 2009 | 2,393 | Good |
| S 7-main St N over Sandstone Creek | 1941 | 2,209 | Poor |
| US 12 over Drainage | 1998 | 1,600 | Fair |
| US 12 over Timber Creek | 1998 | 825 | Fair |
| US 12 over Sandstone Creek | 1998 | 753 | Fair |
| US 12 over RR | 1968 | 696 | Fair |
All bridges nearby: Fallon County, MT bridge conditions · every bridge in Fallon County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.