Westside RD over Porter Creek
GoodSonoma County, California · 1.0 MI N Wohler Br · Structure no. 20C0138
- Built
- 1921
- 104 years old
- Condition
- Good
- inspected October 2024
- Type
- Tee Beam
- Concrete
- Length
- 32 ft
- 1 main span
- Daily traffic
- 1,738
- 2016 count
- Owner
- County
- County Highway Agency
About this bridge
Westside RD over Porter Creek is a concrete tee beam carrying Westside RD over Porter Creek in Sonoma County, California. It was built in 1921, so it is 104 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 1,738 vehicles a day, roughly 1% of them trucks, projected to reach 1,353 by 2046. The structure is 32 ft (9.8 m) long and 22 ft wide. If it were closed, the detour would be 19.3 mi (31 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Westside RD over Porter Creek built?
It was built in 1921, making it 104 years old in 2025.
What condition is Westside RD over Porter 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 October 2024.
How much traffic does Westside RD over Porter Creek carry?
About 1,738 vehicles per day (2016 count), of which roughly 1% are trucks.
How long is Westside RD over Porter Creek?
The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 22 ft wide.
Who owns Westside RD over Porter Creek?
It is owned by the County Highway Agency.