THORNTON ROAD
Carrying THORNTON ROAD over MOSHER SLOUGH
S DAVIS RD IN TX, San Joaquin, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: THORNTON ROAD
The THORNTON ROAD bridge in San Joaquin, California carries THORNTON ROAD over MOSHER SLOUGH. It was built in 1931, making it 95 years old today. It was last reconstructed in 1970, extending its service life. The structure is built primarily of concrete continuous and spans 3 sections, stretching 16.5 meters (54 feet) end to end. Daily traffic averages 26,616 vehicles, placing it in the heavily-trafficked tier of California bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 16.2 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How THORNTON ROAD 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 How the historical reference is calculated.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
- 1931
- Last Reconstructed
- 1970
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 16.5 m (54 ft)
- Deck Width
- 32.5 m (107 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 26,616 vehicles/day
- Structure Number
- 29C0052
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • At 7/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
How to read this record
This page shows what the last federal inspection recorded, not whether THORNTON ROAD 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 THORNTON ROAD against other structures in San Joaquin 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 THORNTON ROAD?
THORNTON ROAD in San Joaquin, California has a deck rating of 7/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is THORNTON ROAD inspected?
THORNTON ROAD'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 26,616 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. THORNTON ROAD 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 THORNTON ROAD?
THORNTON ROAD has an NBI inventory load rating of 16.2 metric tons.
Who is responsible for maintaining THORNTON ROAD?
THORNTON ROAD is owned and maintained by County Highway Agency.
How old is THORNTON ROAD and does age affect safety?
THORNTON ROAD was built in 1931, making it 95 years old and last reconstructed in 1970.
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.