Grand Loop Road over Firehole River
Teton County, Wyoming · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Grand Loop Road over Firehole River in Teton County, Wyoming, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1970, making it 55 years old at the 2025 inventory.
- It carries about 1,807 vehicles a day (traffic count year 2019).
- It is one of 68 of the 122 inventoried bridges in Teton County rated fair (55.7%); 15 (12.3%) 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 September 2024, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- 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 → (44.45386, -110.81975)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete tee beam |
| Length | about 166 ft |
| Location | 16 Mi. NW of West Thumb J |
| NBI structure number | 1570015P0000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wyoming department of transportation.
Busiest bridges in Teton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 89 over Flat Creek | 1969 | 33,675 | Fair |
| Wyo 22 over Wildlife Crossing | 2023 | 18,401 | Good |
| Wyo 22 over Snake River | 2023 | 18,401 | Good |
| US 89 over Flat Creek | 1938 | 15,780 | Poor |
| Wyo 22 over Wildlife Crossing | 2023 | 12,046 | Fair |
| US 89 over Wildlife Crossing | 2017 | 11,949 | Good |
All bridges nearby: Teton County, WY bridge conditions · every bridge in Teton County · Wyoming bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.