Orr Springs RD over South Fork Big River
FairMendocino County, California · 13.5 MI W US 101 · Structure no. 10C0157
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 63 ft
- 1 main span
- Daily traffic
- 134
- 2011 count
- Owner
- County
- County Highway Agency
About this bridge
Orr Springs RD over South Fork Big River is a steel stringer/multi-beam or girder carrying Orr Springs RD over South Fork Big River in Mendocino County, California. It was built in 1971, so it is 54 years old, younger 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 134 vehicles a day, roughly 10% of them trucks, projected to reach 559 by 2042. The structure is 63 ft (19.3 m) long and 29 ft wide. If it were closed, the detour would be 34.2 mi (55 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
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 1971, making it 54 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 134 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 63 ft (19.3 m) long with a longest span of 59 ft (18 m) and a deck 29 ft wide.
Who owns Orr Springs RD over South Fork Big River?
It is owned by the County Highway Agency.