3rd ST over Irwin Creek
GoodMarin County, California · At Hetherton ST · Structure no. 27C0097
- Built
- 1968
- 57 years old
- Condition
- Good
- inspected July 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 23 ft
- 2 main spans
- Daily traffic
- 20,000
- 1978 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
3rd ST over Irwin Creek is a concrete continuous culvert carrying 3rd ST over Irwin Creek in Marin County, California. It was built in 1968, so it is 57 years old, older 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 20,000 vehicles a day, roughly 10% of them trucks, projected to reach 27,716 by 2041. The structure is 23 ft (7 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 3rd ST over Irwin Creek built?
It was built in 1968, making it 57 years old in 2025.
What condition is 3rd ST over Irwin Creek 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 July 2023.
How much traffic does 3rd ST over Irwin Creek carry?
About 20,000 vehicles per day (1978 count), of which roughly 10% are trucks.
How long is 3rd ST over Irwin Creek?
The structure is 23 ft (7 m) long with a longest span of 11 ft (3.4 m) and a deck 72 ft wide.
Who owns 3rd ST over Irwin Creek?
It is owned by the City or Municipal Highway Agency.