Swtwater Spring RD over Porter Creek
GoodSonoma County, California · 4 MI W/O Westside RD · Structure no. 20C0537
- Built
- 2005
- 20 years old
- Condition
- Good
- inspected July 2023
- Type
- Truss - Thru
- Steel
- Length
- 50 ft
- 1 main span
- Daily traffic
- 140
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Swtwater Spring RD over Porter Creek is a steel truss - thru carrying Swtwater Spring RD over Porter Creek in Sonoma County, California. It was built in 2005, so it is 20 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 140 vehicles a day, roughly 3% of them trucks, projected to reach 150 by 2040. The structure is 50 ft (15.2 m) long and 14 ft wide. If it were closed, the detour would be 21.1 mi (34 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 Swtwater Spring RD over Porter Creek built?
It was built in 2005, making it 20 years old in 2025.
What condition is Swtwater Spring 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 July 2023.
How much traffic does Swtwater Spring RD over Porter Creek carry?
About 140 vehicles per day (2015 count), of which roughly 3% are trucks.
How long is Swtwater Spring RD over Porter Creek?
The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m) and a deck 14 ft wide.
Who owns Swtwater Spring RD over Porter Creek?
It is owned by the County Highway Agency.