I 90 over Blackfoot River
Missoula County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 90 over Blackfoot River in Missoula County, Montana, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2018, making it 7 years old at the 2025 inventory.
- It carries about 6,216 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 66 of the 206 inventoried bridges in Missoula County rated good (32.0%); 15 (7.3%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its class is unchanged from 2024 (good), but component ratings moved: substructure 8 to 7.
- Its most recent inspection on record is dated May 2024, 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 → (46.87174, -113.88693)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 486 ft |
| Location | 0.6M W Bonner |
| NBI structure number | 000000000001434 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 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 Missoula County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| N Reserve St over Clark Fork R Flood Plain | 1977 | 35,914 | Fair |
| N Reserve St over Clark Fork River | 1975 | 35,914 | Fair |
| Reserve St over W Broadway St-rr | 1998 | 29,572 | Fair |
| Brooks St-us 12 over Bitterroot River | 1968 | 28,185 | Fair |
| I 90 over Grant Creek | 1965 | 27,328 | Good |
| N Russel Street over Clark Fork River | 2020 | 23,274 | Good |
All bridges nearby: Missoula County, MT bridge conditions · every bridge in Missoula County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.