I 15 over Sep 9TH Rd NE
Teton County, Montana · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I 15 over Sep 9TH Rd NE in Teton 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 1972, making it 53 years old at the 2025 inventory.
- It carries about 1,969 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 34 of the 82 inventoried bridges in Teton County rated good (41.5%); 3 (3.7%) 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 January 2025, 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 → (47.74115, -111.66598)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 80 ft |
| Location | 3M N Power |
| NBI structure number | I00015304+06771 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2025 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Montana department of transportation.
Busiest bridges in Teton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 15 over Sep 9TH Rd NE | 1972 | 1,969 | Good |
| US 89 over Greenfields South Canal | 1983 | 1,798 | Good |
| US 89 over Greenfields Main Canal | 1983 | 1,798 | Good |
| I 15 over Int Main St | 1976 | 1,703 | Fair |
| I 15 over Int Main St | 1976 | 1,703 | Fair |
| I 15 over Teton River | 1977 | 1,703 | Fair |
All bridges nearby: Teton County, MT bridge conditions · every bridge in Teton County · Montana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.