River Road over Hillside
FairSonoma County, California · 1.6 MI E/O SR 116 · Structure no. 20C0545
- Built
- 2007
- 18 years old
- Condition
- Fair
- inspected March 2024
- Type
- Slab
- Concrete Continuous
- Length
- 137 ft
- 4 main spans
- Daily traffic
- 10,250
- 2009 count
- Owner
- County
- County Highway Agency
About this bridge
River Road over Hillside is a concrete continuous slab carrying River Road over Hillside in Sonoma County, California. It was built in 2007, so it is 18 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 10,250 vehicles a day, roughly 3% of them trucks, projected to reach 11,914 by 2044. The structure is 137 ft (41.7 m) long and 20 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was River Road over Hillside built?
It was built in 2007, making it 18 years old in 2025.
What condition is River Road 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 March 2024.
How much traffic does River Road over Hillside carry?
About 10,250 vehicles per day (2009 count), of which roughly 3% are trucks.
How long is River Road over Hillside?
The structure is 137 ft (41.7 m) long with a longest span of 44 ft (13.4 m) and a deck 20 ft wide.
Who owns River Road over Hillside?
It is owned by the County Highway Agency.