Arnold DR over Sonoma Creek
PoorSonoma County, California · 7.8 MI N of SR 116 · Structure no. 20C0214
- Built
- 1924
- 101 years old, rebuilt 1971
- Condition
- Poor
- inspected May 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 130 ft
- 2 main spans
- Daily traffic
- 13,900
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Arnold DR over Sonoma Creek is a concrete continuous tee beam carrying Arnold DR over Sonoma Creek in Sonoma County, California. It was built in 1924 and reconstructed in 1971, so it is 101 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 13,900 vehicles a day, roughly 5% of them trucks, projected to reach 15,252 by 2040. The structure is 130 ft (39.6 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Arnold DR over Sonoma Creek built?
It was built in 1924, making it 101 years old in 2025. It was reconstructed in 1971.
What condition is Arnold DR over Sonoma Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.
How much traffic does Arnold DR over Sonoma Creek carry?
About 13,900 vehicles per day (2015 count), of which roughly 5% are trucks.
How long is Arnold DR over Sonoma Creek?
The structure is 130 ft (39.6 m) long with a longest span of 72 ft (21.9 m) and a deck 42 ft wide.
Who owns Arnold DR over Sonoma Creek?
It is owned by the County Highway Agency.