State Route 1 over Giacomini Gulch
GoodMarin County, California · 04-MRN-001-22.78 · Structure no. 27 0122
- Built
- 2018
- 7 years old
- Condition
- Good
- inspected May 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 40 ft
- 1 main span
- Daily traffic
- 3,650
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Giacomini Gulch is a prestressed concrete slab carrying State Route 1 over Giacomini Gulch in Marin County, California. It was built in 2018, so it is 7 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 3,650 vehicles a day, roughly 1% of them trucks, projected to reach 4,591 by 2042. The structure is 40 ft (12.2 m) long and 40 ft wide. If it were closed, the detour would be 8.1 mi (13 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. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 1 over Giacomini Gulch built?
It was built in 2018, making it 7 years old in 2025.
What condition is State Route 1 over Giacomini Gulch 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 Giacomini Gulch carry?
About 3,650 vehicles per day (2017 count), of which roughly 1% are trucks.
How long is State Route 1 over Giacomini Gulch?
The structure is 40 ft (12.2 m) long with a longest span of 36 ft (11 m) and a deck 40 ft wide.
Who owns State Route 1 over Giacomini Gulch?
It is owned by the State Highway Agency.