State Route 1 over Ellis Creek
FairMarin County, California · 04-MRN-001-34.97 · Structure no. 27 0025
- Built
- 1931
- 94 years old
- Condition
- Fair
- inspected May 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 23 ft
- 2 main spans
- Daily traffic
- 2,300
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Ellis Creek is a concrete continuous culvert carrying State Route 1 over Ellis Creek in Marin County, California. It was built in 1931, so it is 94 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 2,300 vehicles a day, roughly 3% of them trucks, projected to reach 8,981 by 2045. The structure is 23 ft (7 m) long. If it were closed, the detour would be 19.9 mi (32 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 State Route 1 over Ellis Creek built?
It was built in 1931, making it 94 years old in 2025.
What condition is State Route 1 over Ellis Creek 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 Ellis Creek carry?
About 2,300 vehicles per day (2020 count), of which roughly 3% are trucks.
How long is State Route 1 over Ellis Creek?
The structure is 23 ft (7 m) long with a longest span of 10 ft (3.1 m).
Who owns State Route 1 over Ellis Creek?
It is owned by the State Highway Agency.