Leslie RD over Porter Creek
FairSonoma County, California · .7M NW Mark West Sprgs RD · Structure no. 20C0325
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 35 ft
- 2 main spans
- Daily traffic
- 63
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Leslie RD over Porter Creek is a steel continuous stringer/multi-beam or girder carrying Leslie RD over Porter Creek in Sonoma County, California. It was built in 1972, so it is 53 years old, younger than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 63 vehicles a day, roughly 1% of them trucks, projected to reach 110 by 2040. The structure is 35 ft (10.8 m) long and 14 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Leslie RD over Porter Creek built?
It was built in 1972, making it 53 years old in 2025.
What condition is Leslie RD over Porter Creek in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2023.
How much traffic does Leslie RD over Porter Creek carry?
About 63 vehicles per day (2015 count), of which roughly 1% are trucks.
How long is Leslie RD over Porter Creek?
The structure is 35 ft (10.8 m) long with a longest span of 18 ft (5.6 m) and a deck 14 ft wide.
Who owns Leslie RD over Porter Creek?
It is owned by the County Highway Agency.