State Route 1 over Caspar Creek
GoodMendocino County, California · 01-MEN-001-R54.71 · Structure no. 10 0153
- Built
- 1966
- 59 years old
- Condition
- Good
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 862 ft
- 7 main spans
- Daily traffic
- 9,900
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Caspar Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying State Route 1 over Caspar Creek in Mendocino County, California. It was built in 1966, so it is 59 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 9,900 vehicles a day, roughly 5% of them trucks, projected to reach 12,678 by 2043. The structure is 862 ft (262.7 m) long and 34 ft wide. If it were closed, the detour would be 21.7 mi (35 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| 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 State Route 1 over Caspar Creek built?
It was built in 1966, making it 59 years old in 2025.
What condition is State Route 1 over Caspar Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.
How much traffic does State Route 1 over Caspar Creek carry?
About 9,900 vehicles per day (2009 count), of which roughly 5% are trucks.
How long is State Route 1 over Caspar Creek?
The structure is 862 ft (262.7 m) long with a longest span of 116 ft (35.4 m) and a deck 34 ft wide.
Who owns State Route 1 over Caspar Creek?
It is owned by the State Highway Agency.