Byron Highway
Carrying Byron Highway over Delta-Mendota Canal
0.3 MI N Alameda CL, Contra Costa, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: Byron Highway
The Byron Highway bridge in Contra Costa, California carries Byron Highway over Delta-Mendota Canal. It was built in 1953, making it 73 years old today. The structure is built primarily of concrete continuous and spans 3 sections, stretching 13.1 meters (43 feet) end to end. Daily traffic averages 6,500 vehicles, placing it in the moderately-trafficked tier of California bridges. It is owned and maintained by Bureau of Reclamation.
The latest FHWA inspection records show culvert at 7/9. The weakest component sits in good condition. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 32.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How Byron Highway compares
Live comparison across California.
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 How the historical reference is calculated.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
- 1953
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 13.1 m (43 ft)
- Owner
- Bureau of Reclamation
- Avg Daily Traffic
- 6,500 vehicles/day
- Structure Number
- 28C0125
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
This page shows what the last federal inspection recorded, not whether Byron Highway 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 Byron Highway against other structures in Contra Costa and across California. California 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 Byron Highway?
Byron Highway in Contra Costa, California on the FHWA's 0–9 scale.
How often is Byron Highway inspected?
Byron Highway'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 6,500 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. Byron Highway is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for Byron Highway?
Byron Highway has an NBI inventory load rating of 32.4 metric tons.
Who is responsible for maintaining Byron Highway?
Byron Highway is owned and maintained by Bureau of Reclamation.
How old is Byron Highway and does age affect safety?
Byron Highway was built in 1953, making it 73 years old.
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.