River RD over Hillside
FairSonoma County, California · 0.1 MI E/O Canyon 7 Rd. · Structure no. 20C0102
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected October 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 571 ft
- 21 main spans
- Daily traffic
- 10,300
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
River RD over Hillside is a concrete continuous tee beam carrying River RD over Hillside in Sonoma County, California. It was built in 1971, so it is 54 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 6 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 10,300 vehicles a day, roughly 3% of them trucks, projected to reach 10,707 by 2040. The structure is 571 ft (174 m) long and 18 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was River RD over Hillside built?
It was built in 1971, making it 54 years old in 2025.
What condition is River RD over Hillside 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 River RD over Hillside carry?
About 10,300 vehicles per day (2015 count), of which roughly 3% are trucks.
How long is River RD over Hillside?
The structure is 571 ft (174 m) long with a longest span of 27 ft (8.3 m) and a deck 18 ft wide.
Who owns River RD over Hillside?
It is owned by the County Highway Agency.