FOREST ROAD 610
Carrying FOREST ROAD 610 over SOUTH FORK CASPAR CREEK
N OF INT OF FOREST RD 600, Mendocino, California
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: FOREST ROAD 610
The FOREST ROAD 610 bridge in Mendocino, California carries FOREST ROAD 610 over SOUTH FORK CASPAR CREEK. It was built in 1965, making it 61 years old today. It was last reconstructed in 2009, extending its service life. The structure is built primarily of wood or timber and spans 3 sections, stretching 12.9 meters (42 feet) end to end. Daily traffic averages 2 vehicles, placing it in the lower-traffic tier of California bridges. It is owned and maintained by State Park/Forest/Reservation.
The latest FHWA inspection records show a deck rating of 3/9, superstructure at 5/9, substructure at 3/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How FOREST ROAD 610 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 How the historical reference is calculated.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
- 1965
- Last Reconstructed
- 2009
- Material
- Wood or Timber
- Number of Spans
- 3
- Structure Length
- 12.9 m (42 ft)
- Deck Width
- 4.7 m (15 ft)
- Owner
- State Park/Forest/Reservation
- Avg Daily Traffic
- 2 vehicles/day
- Structure Number
- 10F0019
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in poor condition (3/9), showing advanced deterioration that may require priority repair.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • The substructure (piers and abutments) is in poor condition (3/9), showing advanced deterioration that may require priority repair.
How to read this record
FOREST ROAD 610 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 FOREST ROAD 610 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 FOREST ROAD 610?
FOREST ROAD 610 in Mendocino, California has a deck rating of 3/9, superstructure rating of 5/9, and substructure rating of 3/9 on the FHWA's 0–9 scale.
How often is FOREST ROAD 610 inspected?
FOREST ROAD 610'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 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. FOREST ROAD 610 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 FOREST ROAD 610?
An inventory load rating is not recorded for FOREST ROAD 610.
Who is responsible for maintaining FOREST ROAD 610?
FOREST ROAD 610 is owned and maintained by State Park/Forest/Reservation.
How old is FOREST ROAD 610 and does age affect safety?
FOREST ROAD 610 was built in 1965, making it 61 years old and last reconstructed in 2009.
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.