State Route 1 over Lagunitas Creek Overflow
FairMarin County, California · 04-MRN-001-28.39 · Structure no. 27 0022
- Built
- 1929
- 96 years old
- Condition
- Fair
- inspected May 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 33 ft
- 3 main spans
- Daily traffic
- 3,500
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Lagunitas Creek Overflow is a concrete continuous culvert carrying State Route 1 over Lagunitas Creek Overflow in Marin County, California. It was built in 1929, so it is 96 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 3,500 vehicles a day, roughly 4% of them trucks, projected to reach 4,699 by 2042. The structure is 33 ft (10.1 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Culvert | 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 Lagunitas Creek Overflow built?
It was built in 1929, making it 96 years old in 2025.
What condition is State Route 1 over Lagunitas Creek Overflow 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 May 2024.
How much traffic does State Route 1 over Lagunitas Creek Overflow carry?
About 3,500 vehicles per day (2021 count), of which roughly 4% are trucks.
How long is State Route 1 over Lagunitas Creek Overflow?
The structure is 33 ft (10.1 m) long with a longest span of 10 ft (3 m) and a deck 30 ft wide.
Who owns State Route 1 over Lagunitas Creek Overflow?
It is owned by the State Highway Agency.