State Route 1 over Alder Creek
GoodMendocino County, California · 01-MEN-001-22.73 · Structure no. 10 0116
- Built
- 1947
- 78 years old
- Condition
- Good
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 124 ft
- 2 main spans
- Daily traffic
- 1,800
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Alder Creek is a steel continuous stringer/multi-beam or girder carrying State Route 1 over Alder Creek in Mendocino County, California. It was built in 1947, so it is 78 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 1,800 vehicles a day, roughly 12% of them trucks, projected to reach 2,540 by 2042. The structure is 124 ft (37.8 m) long and 33 ft wide. If it were closed, the detour would be 60.9 mi (98 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| 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 State Route 1 over Alder Creek built?
It was built in 1947, making it 78 years old in 2025.
What condition is State Route 1 over Alder 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 August 2024.
How much traffic does State Route 1 over Alder Creek carry?
About 1,800 vehicles per day (2009 count), of which roughly 12% are trucks.
How long is State Route 1 over Alder Creek?
The structure is 124 ft (37.8 m) long with a longest span of 60 ft (18.3 m) and a deck 33 ft wide.
Who owns State Route 1 over Alder Creek?
It is owned by the State Highway Agency.