WOLFBACK RIDGE RD
Carrying WOLFBACK RIDGE RD over U.S. HIGHWAY 101
04-MRN-101-1.52-SAUS, Marin, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: WOLFBACK RIDGE RD
The WOLFBACK RIDGE RD bridge in Marin, California carries WOLFBACK RIDGE RD over U.S. HIGHWAY 101. It was built in 1954, making it 72 years old today. The structure is built primarily of concrete continuous. Daily traffic averages 106,000 vehicles, placing it in the heavily-trafficked tier of California bridges.
The latest FHWA inspection records show limited component ratings on file. The weakest component sits in unrated condition. All reported major components score above the Poor range.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How WOLFBACK RIDGE RD 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 How the historical reference is calculated.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
- 1954
- Material
- Concrete Continuous
- Avg Daily Traffic
- 106,000 vehicles/day
- Structure Number
- 27 0066
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 WOLFBACK RIDGE RD 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 WOLFBACK RIDGE RD against other structures in Marin 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 WOLFBACK RIDGE RD?
WOLFBACK RIDGE RD in Marin, California on the FHWA's 0–9 scale.
How often is WOLFBACK RIDGE RD inspected?
WOLFBACK RIDGE RD'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 106,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. WOLFBACK RIDGE RD is currently shown as unrated condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for WOLFBACK RIDGE RD?
An inventory load rating is not recorded for WOLFBACK RIDGE RD.
Who is responsible for maintaining WOLFBACK RIDGE RD?
Ownership is not specified for WOLFBACK RIDGE RD in the NBI.
How old is WOLFBACK RIDGE RD and does age affect safety?
WOLFBACK RIDGE RD was built in 1954, making it 72 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.