State Route 1 over Hillside
GoodMarin County, California · 04-MRN-001-11.63 · Structure no. 27 0106
- Built
- 1982
- 43 years old
- Condition
- Good
- inspected May 2024
- Type
- Slab
- Concrete Continuous
- Length
- 94 ft
- 6 main spans
- Daily traffic
- 4,100
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Hillside is a concrete continuous slab carrying State Route 1 over Hillside 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 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 4,100 vehicles a day, projected to reach 5,151 by 2044. The structure is 94 ft (28.7 m) long and 6 ft wide. If it were closed, the detour would be 18 mi (29 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 1 over Hillside built?
It was built in 1982, making it 43 years old in 2025.
What condition is State Route 1 over Hillside 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 May 2024.
How much traffic does State Route 1 over Hillside carry?
About 4,100 vehicles per day (2020 count).
How long is State Route 1 over Hillside?
The structure is 94 ft (28.7 m) long with a longest span of 16 ft (4.9 m) and a deck 6 ft wide.
Who owns State Route 1 over Hillside?
It is owned by the State Highway Agency.