N680-DIABLO RD OFF
Carrying N680-DIABLO RD OFF over SAN RAMON CREEK
04-CC-680-R7.35-DNVL, Contra Costa, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: N680-DIABLO RD OFF
The N680-DIABLO RD OFF bridge in Contra Costa, California carries N680-DIABLO RD OFF over SAN RAMON CREEK. It was built in 1975, making it 51 years old today. The structure is built primarily of concrete continuous and spans 7 sections, stretching 170.1 meters (558 feet) end to end. Daily traffic averages 4,650 vehicles, placing it in the moderately-trafficked tier of California bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range. Its NBI inventory load rating is 66.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How N680-DIABLO RD OFF 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 How the historical reference is calculated.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
- 1975
- Material
- Concrete Continuous
- Number of Spans
- 7
- Structure Length
- 170.1 m (558 ft)
- Deck Width
- 7.9 m (26 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 4,650 vehicles/day
- Structure Number
- 28 0197S
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 5/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • At 7/9, the substructure (piers and abutments) is in good shape and shows no significant wear.
How to read this record
This page shows what the last federal inspection recorded, not whether N680-DIABLO RD OFF 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 N680-DIABLO RD OFF 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 N680-DIABLO RD OFF?
N680-DIABLO RD OFF in Contra Costa, California has a deck rating of 5/9, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is N680-DIABLO RD OFF inspected?
N680-DIABLO RD OFF'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 4,650 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. N680-DIABLO RD OFF 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 N680-DIABLO RD OFF?
N680-DIABLO RD OFF has an NBI inventory load rating of 66.4 metric tons.
Who is responsible for maintaining N680-DIABLO RD OFF?
N680-DIABLO RD OFF is owned and maintained by State Highway Agency.
How old is N680-DIABLO RD OFF and does age affect safety?
N680-DIABLO RD OFF was built in 1975, making it 51 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.