US Highway 101 over N Br Laguna De Santa Rsa
FairSonoma County, California · 04-SON-101-15.52 · Structure no. 20 0174
- Built
- 1957
- 68 years old
- Condition
- Fair
- inspected April 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 33 ft
- 3 main spans
- Daily traffic
- 92,000
- 2016 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 over N Br Laguna De Santa Rsa is a concrete continuous culvert carrying US Highway 101 over N Br Laguna De Santa Rsa in Sonoma County, California. It was built in 1957, so it is 68 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 6 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 92,000 vehicles a day, roughly 6% of them trucks, projected to reach 170,145 by 2046. The structure is 33 ft (10.1 m) long and 139 ft wide. If it were closed, the detour would be 5 mi (8 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US Highway 101 over N Br Laguna De Santa Rsa built?
It was built in 1957, making it 68 years old in 2025.
What condition is US Highway 101 over N Br Laguna De Santa Rsa 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 April 2024.
How much traffic does US Highway 101 over N Br Laguna De Santa Rsa carry?
About 92,000 vehicles per day (2016 count), of which roughly 6% are trucks.
How long is US Highway 101 over N Br Laguna De Santa Rsa?
The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3 m) and a deck 139 ft wide.
Who owns US Highway 101 over N Br Laguna De Santa Rsa?
It is owned by the State Highway Agency.