BEACH RD (MAIN ST)
Carrying BEACH RD (MAIN ST) over SAN FRANCISCO BAY
INTERSECTION BEACH & MAIN, Marin, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: BEACH RD (MAIN ST)
The BEACH RD (MAIN ST) bridge in Marin, California carries BEACH RD (MAIN ST) over SAN FRANCISCO BAY. It was built in 1918, making it 108 years old today. The structure is built primarily of concrete continuous and spans 2 sections, stretching 20.5 meters (67 feet) end to end. Daily traffic averages 2,000 vehicles, placing it in the moderately-trafficked tier of California bridges. It is owned and maintained by City/Municipal Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 4/9, substructure at 4/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed. Its NBI inventory load rating is 13.6 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How BEACH RD (MAIN ST) 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 How the historical reference is calculated.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
- 1918
- Material
- Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 20.5 m (67 ft)
- Deck Width
- 6.1 m (20 ft)
- Owner
- City/Municipal Highway Agency
- Avg Daily Traffic
- 2,000 vehicles/day
- Structure Number
- 27C0175
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • The superstructure (beams and supports above the deck) is in poor condition (4/9), showing advanced deterioration that may require priority repair.
- • At 4/9, the substructure (piers and abutments) is in poor shape, with advanced wear flagged for priority repair.
How to read this record
BEACH RD (MAIN ST) 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 BEACH RD (MAIN ST) 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 BEACH RD (MAIN ST)?
BEACH RD (MAIN ST) in Marin, California has a deck rating of 7/9, superstructure rating of 4/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is BEACH RD (MAIN ST) inspected?
BEACH RD (MAIN ST)'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 2,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. BEACH RD (MAIN ST) 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 BEACH RD (MAIN ST)?
BEACH RD (MAIN ST) has an NBI inventory load rating of 13.6 metric tons.
Who is responsible for maintaining BEACH RD (MAIN ST)?
BEACH RD (MAIN ST) is owned and maintained by City/Municipal Highway Agency.
How old is BEACH RD (MAIN ST) and does age affect safety?
BEACH RD (MAIN ST) was built in 1918, making it 108 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.