Mill Creek RD over Mill Creek
PoorSonoma County, California · 5.4 MI W of Westside RD · Structure no. 20C0346
- Built
- 1961
- 64 years old
- Condition
- Poor
- inspected May 2023
- Type
- Slab
- Concrete Continuous
- Length
- 74 ft
- 3 main spans
- Daily traffic
- 210
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Mill Creek RD over Mill Creek is a concrete continuous slab carrying Mill Creek RD over Mill Creek in Sonoma County, California. It was built in 1961, so it is 64 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 2 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 210 vehicles a day, roughly 1% of them trucks, projected to reach 274 by 2040. The structure is 74 ft (22.6 m) long and 25 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 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 | 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 | 2 Critical | Advanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken. |
| 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 Mill Creek RD over Mill Creek built?
It was built in 1961, making it 64 years old in 2025.
What condition is Mill Creek RD over Mill 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 Mill Creek RD over Mill Creek carry?
About 210 vehicles per day (2015 count), of which roughly 1% are trucks.
How long is Mill Creek RD over Mill Creek?
The structure is 74 ft (22.6 m) long with a longest span of 28 ft (8.5 m) and a deck 25 ft wide.
Who owns Mill Creek RD over Mill Creek?
It is owned by the County Highway Agency.