Treatment Plant RD over U.S. Highway 101
FairMendocino County, California · 01-MEN-101-R21.80 · Structure no. 10 0185
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected April 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 156 ft
- 2 main spans
- Daily traffic
- 1,000
- 2011 count
- Owner
- State
- State Highway Agency
About this bridge
Treatment Plant RD over U.S. Highway 101 is a concrete continuous tee beam carrying Treatment Plant RD over U.S. Highway 101 in Mendocino County, California. It was built in 1964, so it is 61 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 1,000 vehicles a day, roughly 2% of them trucks, projected to reach 1,297 by 2043. The structure is 156 ft (47.5 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Treatment Plant RD over U.S. Highway 101 built?
It was built in 1964, making it 61 years old in 2025.
What condition is Treatment Plant RD over U.S. Highway 101 in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2023.
How much traffic does Treatment Plant RD over U.S. Highway 101 carry?
About 1,000 vehicles per day (2011 count), of which roughly 2% are trucks.
How long is Treatment Plant RD over U.S. Highway 101?
The structure is 156 ft (47.5 m) long with a longest span of 77 ft (23.4 m) and a deck 34 ft wide.
Who owns Treatment Plant RD over U.S. Highway 101?
It is owned by the State Highway Agency.