FOREST ROAD 452
Carrying FOREST ROAD 452 over HARE CREEK
WEST OF JCT FOREST RD 400, Mendocino, California
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
FOREST ROAD 452 in Mendocino, California sits above 94% of rated California bridges on inventory load rating (50 t), while its 1997 build year is earlier than 14% of Mendocino's recorded-year cohort (357 bridges).
FOREST ROAD 452 in Mendocino, California is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1997, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure CA:10F0057
LATE-CENTURY · STEEL · SINGLE-SPAN · SUB-LED · TRACE-ADT · HEAVY-LOAD · CAT-POOR
- LATE-CENTURY 1980–1999
- STEEL Steel
- SINGLE-SPAN Single span
- SUB-LED Substructure-led
- TRACE-ADT Trace ADT
- HEAVY-LOAD Heavy load
- CAT-POOR Poor
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: FOREST ROAD 452
The FOREST ROAD 452 bridge in Mendocino, California carries FOREST ROAD 452 over HARE CREEK. It was built in 1997, making it 29 years old today. The structure is built primarily of steel and spans 1 section, stretching 16.1 meters (53 feet) end to end. Daily traffic averages 10 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 7/9, superstructure at 5/9, 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.
How FOREST ROAD 452 compares
Age against the county: built in 1997, earlier than 49 of Mendocino's 357 bridges with a recorded construction year (14%), against a county median build year of 1964. This is one of the newer structures in its county.
Live comparison across California bridges with a recorded inventory load rating (25,538 of 25,848 rated).
FOREST ROAD 452 vs every rated California bridge
Inventory load rating (metric tons), FHWA NBI, this state
50 Top 6% higher than 94% of 25,538 bridges
rated California bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Mendocino inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 357 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 1997
- Material
- Steel
- Number of Spans
- 1
- Structure Length
- 16.1 m (53 ft)
- Deck Width
- 3.6 m (12 ft)
- Owner
- State Park/Forest/Reservation
- Avg Daily Traffic
- 10 vehicles/day
- Structure Number
- 10F0057
Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • The superstructure (beams and supports above the deck) is in fair condition (5/9), with minor deterioration that may require routine maintenance.
- • At 4/9, the substructure (piers and abutments) is in poor shape, with advanced wear on file for this vintage.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
FOREST ROAD 452 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 452 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 452?
FOREST ROAD 452 in Mendocino, California has a deck rating of 7/9, superstructure rating of 5/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is FOREST ROAD 452 inspected?
FOREST ROAD 452'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 10 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. FOREST ROAD 452 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 452?
FOREST ROAD 452 has an NBI inventory load rating of 49.9 metric tons.
Who is responsible for maintaining FOREST ROAD 452?
FOREST ROAD 452 is owned and maintained by State Park/Forest/Reservation.
How old is FOREST ROAD 452 and does age affect safety?
FOREST ROAD 452 was built in 1997, making it 29 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.
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Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.