Orr Springs RD over South Fork Big River
FairMendocino County, California · 14.5 MI W US 101 · Structure no. 10C0156
- Built
- 1959
- 66 years old
- Condition
- Fair
- inspected February 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 55 ft
- 1 main span
- Daily traffic
- 1,002
- 2011 count
- Owner
- County
- County Highway Agency
About this bridge
Orr Springs RD over South Fork Big River is a prestressed concrete tee beam carrying Orr Springs RD over South Fork Big River in Mendocino County, California. It was built in 1959, so it is 66 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 1,002 vehicles a day, roughly 10% of them trucks, projected to reach 1,018 by 2046. The structure is 55 ft (16.7 m) long and 24 ft wide. If it were closed, the detour would be 34.8 mi (56 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 | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Orr Springs RD over South Fork Big River built?
It was built in 1959, making it 66 years old in 2025.
What condition is Orr Springs RD over South Fork Big River 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 February 2024.
How much traffic does Orr Springs RD over South Fork Big River carry?
About 1,002 vehicles per day (2011 count), of which roughly 10% are trucks.
How long is Orr Springs RD over South Fork Big River?
The structure is 55 ft (16.7 m) long with a longest span of 52 ft (15.7 m) and a deck 24 ft wide.
Who owns Orr Springs RD over South Fork Big River?
It is owned by the County Highway Agency.