STATE ROUTE 20
Carrying STATE ROUTE 20 over BAECHTEL CREEK
01-MEN-020-33.64-WLTS, Mendocino, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: STATE ROUTE 20
The STATE ROUTE 20 bridge in Mendocino, California carries STATE ROUTE 20 over BAECHTEL CREEK. It was built in 1937, making it 89 years old today. It was last reconstructed in 1964, extending its service life. The structure is built primarily of concrete continuous and spans 3 sections, stretching 21.7 meters (71 feet) end to end. Daily traffic averages 18,350 vehicles, placing it in the heavily-trafficked tier of California bridges. It is owned and maintained by State 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. All reported major components score above the Poor range. Its NBI inventory load rating is 24.6 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How STATE ROUTE 20 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 How the historical reference is calculated.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
- 1937
- Last Reconstructed
- 1964
- Material
- Concrete Continuous
- Number of Spans
- 3
- Structure Length
- 21.7 m (71 ft)
- Deck Width
- 25.0 m (82 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 18,350 vehicles/day
- Structure Number
- 10 0013
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.
- • 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 STATE ROUTE 20 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 STATE ROUTE 20 against other structures in Mendocino 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 STATE ROUTE 20?
STATE ROUTE 20 in Mendocino, 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 STATE ROUTE 20 inspected?
STATE ROUTE 20'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 18,350 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. STATE ROUTE 20 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 STATE ROUTE 20?
STATE ROUTE 20 has an NBI inventory load rating of 24.6 metric tons.
Who is responsible for maintaining STATE ROUTE 20?
STATE ROUTE 20 is owned and maintained by State Highway Agency.
How old is STATE ROUTE 20 and does age affect safety?
STATE ROUTE 20 was built in 1937, making it 89 years old and last reconstructed in 1964.
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.