SR 822 DAYTON VLY
Carrying SR 822 DAYTON VLY over CARSON RVR
DAYTON, Lyon, Nevada
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SR 822 DAYTON VLY
The SR 822 DAYTON VLY bridge in Lyon, Nevada carries SR 822 DAYTON VLY over CARSON RVR. It was built in 1956, making it 70 years old today. It was last reconstructed in 1991, extending its service life. The structure is built primarily of concrete and spans 3 sections, stretching 64.9 meters (213 feet) end to end. Daily traffic averages 11,200 vehicles, placing it in the heavily-trafficked tier of Nevada bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 6/9, substructure at 6/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 46.3 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SR 822 DAYTON VLY compares
Live comparison across Nevada.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 1956
- Last Reconstructed
- 1991
- Material
- Concrete
- Number of Spans
- 3
- Structure Length
- 64.9 m (213 ft)
- Deck Width
- 20.9 m (69 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 11,200 vehicles/day
- Structure Number
- B 637
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • At 6/9, the substructure (piers and abutments) shows fair condition, with minor wear flagged for upkeep.
How to read this record
This page shows what the last federal inspection recorded, not whether SR 822 DAYTON VLY is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare SR 822 DAYTON VLY against other structures in Lyon and across Nevada. Nevada bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for SR 822 DAYTON VLY?
SR 822 DAYTON VLY in Lyon, Nevada has a deck rating of 7/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is SR 822 DAYTON VLY inspected?
SR 822 DAYTON VLY's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 11,200 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SR 822 DAYTON VLY is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for SR 822 DAYTON VLY?
SR 822 DAYTON VLY has an NBI inventory load rating of 46.3 metric tons.
Who is responsible for maintaining SR 822 DAYTON VLY?
SR 822 DAYTON VLY is owned and maintained by State Highway Agency.
How old is SR 822 DAYTON VLY and does age affect safety?
SR 822 DAYTON VLY was built in 1956, making it 70 years old and last reconstructed in 1991.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.