Chalk Hill RD over Maacama Creek
FairSonoma County, California · 1 MI S of SR 128 · Structure no. 20C0242
- Built
- 1915
- 110 years old
- Condition
- Fair
- inspected July 2023
- Type
- Arch - Deck
- Concrete
- Length
- 170 ft
- 1 main span
- Daily traffic
- 800
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Chalk Hill RD over Maacama Creek is a concrete arch - deck carrying Chalk Hill RD over Maacama Creek in Sonoma County, California. It was built in 1915, so it is 110 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 5 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 800 vehicles a day, roughly 1% of them trucks, projected to reach 419 by 2040. The structure is 170 ft (51.8 m) long and 18 ft wide. If it were closed, the detour would be 24.9 mi (40 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Maacama Creek built?
It was built in 1915, making it 110 years old in 2025.
What condition is Chalk Hill RD over Maacama 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 July 2023.
How much traffic does Chalk Hill RD over Maacama Creek carry?
About 800 vehicles per day (2015 count), of which roughly 1% are trucks.
How long is Chalk Hill RD over Maacama Creek?
The structure is 170 ft (51.8 m) long with a longest span of 110 ft (33.5 m) and a deck 18 ft wide.
Who owns Chalk Hill RD over Maacama Creek?
It is owned by the County Highway Agency.