TREATMENT PLANT RD
Carrying TREATMENT PLANT RD over U.S. HIGHWAY 101
01-MEN-101-R21.80, Mendocino, California
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
TREATMENT PLANT RD in Mendocino, California sits above 24% of rated California bridges on inventory load rating (26 t), while its 1964 build year is earlier than 48% of Mendocino's recorded-year cohort (357 bridges).
TREATMENT PLANT RD in Mendocino, California is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1964, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 5. The lowest applicable rating sets the federal condition category, so this Fair 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:10 0185
INTERSTATE-ERA · CONCRETE · MULTI-SPAN · SUPER-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- CONCRETE Concrete
- MULTI-SPAN 2 spans
- SUPER-LED Superstructure-led
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
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: TREATMENT PLANT RD
The TREATMENT PLANT RD bridge in Mendocino, California carries TREATMENT PLANT RD over U.S. HIGHWAY 101. It was built in 1964, making it 62 years old today. The structure is built primarily of concrete continuous and spans 2 sections, stretching 47.5 meters (156 feet) end to end. Daily traffic averages 1,000 vehicles, placing it in the lower-traffic 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 5/9, substructure at 7/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range.
How TREATMENT PLANT RD compares
Age against the county: built in 1964, earlier than 173 of Mendocino's 357 bridges with a recorded construction year (48%), against a county median build year of 1964.
Live comparison across California bridges with a recorded inventory load rating (25,538 of 25,848 rated).
TREATMENT PLANT RD vs every rated California bridge
Inventory load rating (metric tons), FHWA NBI, this state
26 Top 76% higher than 24% 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
- 1964
- Material
- Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 47.5 m (156 ft)
- Deck Width
- 10.4 m (34 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 1,000 vehicles/day
- Structure Number
- 10 0185
Condition Analysis
- • The deck (driving surface) rates good at 7/9, with no significant deterioration on file.
- • 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 good condition (7/9), showing no significant deterioration.
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 TREATMENT PLANT 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 TREATMENT PLANT RD 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 TREATMENT PLANT RD?
TREATMENT PLANT RD in Mendocino, California has a deck rating of 7/9, superstructure rating of 5/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is TREATMENT PLANT RD inspected?
TREATMENT PLANT 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 1,000 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. TREATMENT PLANT RD is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for TREATMENT PLANT RD?
TREATMENT PLANT RD has an NBI inventory load rating of 25.9 metric tons.
Who is responsible for maintaining TREATMENT PLANT RD?
TREATMENT PLANT RD is owned and maintained by State Highway Agency.
How old is TREATMENT PLANT RD and does age affect safety?
TREATMENT PLANT RD was built in 1964, making it 62 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.
Share this inspection record
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.