I 90 over Yellowstone River
Stillwater County, Montana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 90 over Yellowstone River in Stillwater County, Montana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1976, making it 49 years old at the 2025 inventory.
- It carries about 5,423 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 63 of the 92 inventoried bridges in Stillwater County rated fair (68.5%); 1 (1.1%) are rated poor.
- 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 → (45.68266, -109.432)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 7 | Good condition |
| Substructure | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 577 ft |
| Location | 5.6M E Reed Point |
| NBI structure number | I00090398+00812 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Stillwater County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 90 over Cove Irrigation Ditch | 1970 | 12,321 | Good |
| I 90 over Int Exit 396 | 1963 | 10,845 | Fair |
| I 90 over Int Park City | 1967 | 7,580 | Fair |
| I 90 over Int Park City | 1967 | 7,580 | Fair |
| I 90 over Sep Pope Road | 1967 | 7,580 | Fair |
| I 90 over Sep Pope Road | 1967 | 7,580 | Fair |
All bridges nearby: Stillwater County, MT bridge conditions · every bridge in Stillwater County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.