Chalk Hill RD over Franz Creek
GoodSonoma County, California · 3 MI South SR 128 · Structure no. 20C0329
- Built
- 1965
- 60 years old
- Condition
- Good
- inspected July 2021
- Type
- Slab
- Concrete Continuous
- Length
- 156 ft
- 4 main spans
- Daily traffic
- 850
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Chalk Hill RD over Franz Creek is a concrete continuous slab carrying Chalk Hill RD over Franz Creek in Sonoma County, California. It was built in 1965, so it is 60 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 850 vehicles a day, roughly 2% of them trucks, projected to reach 1,000 by 2040. The structure is 156 ft (47.5 m) long and 33 ft wide. If it were closed, the detour would be 23 mi (37 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| 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 Chalk Hill RD over Franz Creek built?
It was built in 1965, making it 60 years old in 2025.
What condition is Chalk Hill RD over Franz Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2021.
How much traffic does Chalk Hill RD over Franz Creek carry?
About 850 vehicles per day (2015 count), of which roughly 2% are trucks.
How long is Chalk Hill RD over Franz Creek?
The structure is 156 ft (47.5 m) long with a longest span of 44 ft (13.4 m) and a deck 33 ft wide.
Who owns Chalk Hill RD over Franz Creek?
It is owned by the County Highway Agency.