WATMAUGH ROAD
Carrying WATMAUGH ROAD over FOWLER CREEK
0.3 MI E ARNOLD, Sonoma, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: WATMAUGH ROAD
The WATMAUGH ROAD bridge in Sonoma, California carries WATMAUGH ROAD over FOWLER CREEK. It was built in 1920, making it 106 years old today. It was last reconstructed in 1965, extending its service life. The structure is built primarily of concrete continuous and spans 3 sections, stretching 16.2 meters (53 feet) end to end. Daily traffic averages 3,300 vehicles, placing it in the moderately-trafficked tier of California bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 5/9, superstructure at 5/9, substructure at 2/9. The weakest component sits in critical condition. Because at least one major component scores 4 or lower, this bridge falls in FHWA's Poor condition category. That category is not a closure order. Its NBI inventory load rating is 22.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How WATMAUGH 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 How the historical reference is calculated.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
- 1920
- Last Reconstructed
- 1965
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 16.2 m (53 ft)
- Deck Width
- 12.8 m (42 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 3,300 vehicles/day
- Structure Number
- 20C0257
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 fair at 5/9, minor deterioration that routine maintenance should address.
- • At 2/9, the substructure (piers and abutments) is in critical shape, with severe wear requiring urgent action.
How to read this record
WATMAUGH ROAD is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare WATMAUGH ROAD against other structures in Sonoma 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 WATMAUGH ROAD?
WATMAUGH ROAD in Sonoma, California has a deck rating of 5/9, superstructure rating of 5/9, and substructure rating of 2/9 on the FHWA's 0–9 scale.
How often is WATMAUGH ROAD inspected?
WATMAUGH 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 3,300 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. WATMAUGH ROAD is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for WATMAUGH ROAD?
WATMAUGH ROAD has an NBI inventory load rating of 22.4 metric tons.
Who is responsible for maintaining WATMAUGH ROAD?
WATMAUGH ROAD is owned and maintained by County Highway Agency.
How old is WATMAUGH ROAD and does age affect safety?
WATMAUGH ROAD was built in 1920, making it 106 years old and last reconstructed in 1965.
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.