Wyo 450 over N Prong Lttle Thunder Cr
Campbell County, Wyoming · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Wyo 450 over N Prong Lttle Thunder Cr in Campbell County, Wyoming, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1978, making it 47 years old at the 2025 inventory.
- It carries about 1,479 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 114 of the 152 inventoried bridges in Campbell County rated fair (75.0%); 4 (2.6%) 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 November 2023, on a 24-month routine inspection cycle.
- 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 → (43.723, -105.33871)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel culvert |
| Length | about 28 ft |
| Location | 8 Mi. SW of Wright |
| NBI structure number | NFD |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wyoming department of transportation.
Busiest bridges in Campbell County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Wyo 59 over Donkey Creek | 1975 | 22,352 | Fair |
| Wyo 59 over Antelope Butte Creek | 1975 | 19,425 | Fair |
| Wyo 59 over Homestead Trickle | 2008 | 18,150 | Good |
| Wyo 59 over Burlington Supply Ditch | 1941 | 14,340 | Fair |
| Wyo 59 over Stonepile Creek | 1981 | 14,340 | Fair |
| S Gurley Avenue over BNSF / US 14/16 | 1982 | 10,545 | Fair |
All bridges nearby: Campbell County, WY bridge conditions · every bridge in Campbell County · Wyoming bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.