Old Monte Rio Road over Hillside
FairSonoma County, California · At Santa Rosa Avenue · Structure no. 20C0397
- Built
- 1960
- 65 years old, rebuilt 2010
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 76 ft
- 4 main spans
- Daily traffic
- 100
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Old Monte Rio Road over Hillside is a steel stringer/multi-beam or girder carrying Old Monte Rio Road over Hillside in Sonoma County, California. It was built in 1960 and reconstructed in 2010, so it is 65 years old, older 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 100 vehicles a day, projected to reach 109 by 2042. The structure is 76 ft (23.1 m) long and 20 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old Monte Rio Road over Hillside built?
It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2010.
What condition is Old Monte Rio 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 November 2024.
How much traffic does Old Monte Rio Road over Hillside carry?
About 100 vehicles per day (2015 count).
How long is Old Monte Rio Road over Hillside?
The structure is 76 ft (23.1 m) long with a longest span of 19 ft (5.9 m) and a deck 20 ft wide.
Who owns Old Monte Rio Road over Hillside?
It is owned by the County Highway Agency.