Orr Springs RD over South Fork Big River
PoorMendocino County, California · 19.8 MI W of US 101 · Structure no. 10C0154
- Built
- 1955
- 70 years old
- Condition
- Poor
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 83 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 1955, so it is 70 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 134 vehicles a day, roughly 10% of them trucks, projected to reach 204 by 2042. The structure is 83 ft (25.3 m) long and 24 ft wide. If it were closed, the detour would be 39.8 mi (64 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 1955, making it 70 years old in 2025.
What condition is Orr Springs RD over South Fork Big River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. 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 83 ft (25.3 m) long with a longest span of 80 ft (24.3 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.