State Route 1 over Stemple Creek
FairMarin County, California · 04-MRN-001-47.41 · Structure no. 27 0027
- Built
- 1982
- 43 years old
- Condition
- Fair
- inspected May 2024
- Type
- Slab
- Concrete Continuous
- Length
- 210 ft
- 7 main spans
- Daily traffic
- 1,100
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Stemple Creek is a concrete continuous slab carrying State Route 1 over Stemple Creek in Marin County, California. It was built in 1982, so it is 43 years old, younger 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 5 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 1,100 vehicles a day, roughly 3% of them trucks, projected to reach 2,100 by 2045. The structure is 210 ft (64 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Stemple Creek built?
It was built in 1982, making it 43 years old in 2025.
What condition is State Route 1 over Stemple 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 Stemple Creek carry?
About 1,100 vehicles per day (2021 count), of which roughly 3% are trucks.
How long is State Route 1 over Stemple Creek?
The structure is 210 ft (64 m) long with a longest span of 36 ft (11 m) and a deck 35 ft wide.
Who owns State Route 1 over Stemple Creek?
It is owned by the State Highway Agency.