Sonoma Mtn RD over Lynch Creek
FairSonoma County, California · 0.35 MI NW Adobe RD · Structure no. 20C0308
- Built
- 1984
- 41 years old
- Condition
- Fair
- inspected February 2025
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 62 ft
- 1 main span
- Daily traffic
- 475
- 2018 count
- Owner
- County
- County Highway Agency
About this bridge
Sonoma Mtn RD over Lynch Creek is a prestressed concrete tee beam carrying Sonoma Mtn RD over Lynch Creek in Sonoma County, California. It was built in 1984, so it is 41 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 475 vehicles a day, roughly 5% of them trucks, projected to reach 549 by 2043. The structure is 62 ft (18.9 m) long and 31 ft wide. If it were closed, the detour would be 123.7 mi (199 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sonoma Mtn RD over Lynch Creek built?
It was built in 1984, making it 41 years old in 2025.
What condition is Sonoma Mtn RD over Lynch 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 February 2025.
How much traffic does Sonoma Mtn RD over Lynch Creek carry?
About 475 vehicles per day (2018 count), of which roughly 5% are trucks.
How long is Sonoma Mtn RD over Lynch Creek?
The structure is 62 ft (18.9 m) long with a longest span of 58 ft (17.6 m) and a deck 31 ft wide.
Who owns Sonoma Mtn RD over Lynch Creek?
It is owned by the County Highway Agency.