Firehole Lake Driv over Thermal Area Drainage
Teton County, Wyoming · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Firehole Lake Driv over Thermal Area Drainage in Teton County, Wyoming, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1935, making it 90 years old at the 2025 inventory.
- It carries about 1,500 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.
- 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 → (44.54081, -110.80144)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Timber slab |
| Length | about 28 ft |
| Location | 10 +/- Mi. South of Madis |
| NBI structure number | 1570062P0000000 |
| Condition class | Fair |
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.