Na Cnty Rd 408 over North Platte River
Natrona County, Wyoming · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Na Cnty Rd 408 over North Platte River in Natrona County, Wyoming, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1957, making it 68 years old at the 2025 inventory.
- It carries about 84 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 85 of the 135 inventoried bridges in Natrona County rated fair (63.0%); 5 (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 September 2023, on a 24-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (42.47089, -106.79611)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel through truss |
| Length | about 144 ft |
| Location | 7.5 Miles S.W. Of Alcova |
| NBI structure number | DUZ |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 9: foundations on dry land well above flood elevations |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wyoming department of transportation.
Busiest bridges in Natrona County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Wyo 220 over Garden Creek | 2001 | 26,351 | Fair |
| Wyo 220 over North Platte River | 1969 | 14,749 | Fair |
| Wyo 220 over BNSF Railway | 1969 | 14,641 | Fair |
| I-25 Sbl over North McKinley Street | 1958 | 12,618 | Fair |
| I-25 Nbl over North McKinley Street | 1958 | 12,577 | Fair |
| I-25 NBL and SBL over Walsh Drive | 2022 | 12,577 | Good |
All bridges nearby: Natrona County, WY bridge conditions · every bridge in Natrona County · Wyoming bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.