SR 822 Dayton Vly over Carson Rvr
Lyon County, Nevada · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 822 Dayton Vly over Carson Rvr in Lyon County, Nevada, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1956 and reconstructed in 1991, making it 69 years old at the 2025 inventory.
- It carries about 11,200 vehicles a day (traffic count year 2021).
- Its listed owner is the state highway agency.
- It is one of 19 of the 54 inventoried bridges in Lyon County rated fair (35.2%); 4 (7.4%) 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 April 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 → (39.23679, -119.58782)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete multiple box beam |
| Length | about 212 ft |
| Location | Dayton |
| NBI structure number | B 637 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Nevada department of transportation.
Busiest bridges in Lyon County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 95A over UPRR | 2006 | 29,500 | Good |
| US 50 over Ditch | 2012 | 18,600 | Good |
| I 80E over Sprr | 1963 | 10,850 | Good |
| I 80W over Sprr | 1963 | 10,850 | Good |
| I 80E over Vine St Grade Sep MP47 | 1963 | 10,850 | Good |
| I 80W over Vine St Grade Sep MP47 | 1963 | 10,850 | Good |
All bridges nearby: Lyon County, NV bridge conditions · every bridge in Lyon County · Nevada bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.