US Bridges

Old Redwood HWY over Pruitt Creek

Fair

Sonoma County, California · 1.75 MI S Pleasant RD · Structure no. 20C0084

Built
1913
112 years old, rebuilt 1925
Condition
Fair
inspected February 2025
Type
Culvert
Concrete Continuous
Length
24 ft
2 main spans
Daily traffic
9,000
2018 count
Owner
County
County Highway Agency

About this bridge

Old Redwood HWY over Pruitt Creek is a concrete continuous culvert carrying Old Redwood HWY over Pruitt Creek in Sonoma County, California. It was built in 1913 and reconstructed in 1925, so it is 112 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 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 9,000 vehicles a day, roughly 2% of them trucks, projected to reach 11,865 by 2047. The structure is 24 ft (7.3 m) long and 41 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesOld Redwood HWY
CrossesPruitt Creek
Location1.75 MI S Pleasant RD
RouteCounty Highway 0
Coordinates38.52122, -122.77524
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating23.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span11 ft (3.3 m)
Deck width41 ft (12.5 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2018)
Projected traffic11,865 by 2047
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Old Redwood HWY over Pruitt Creek built?

It was built in 1913, making it 112 years old in 2025. It was reconstructed in 1925.

What condition is Old Redwood HWY over Pruitt 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 Old Redwood HWY over Pruitt Creek carry?

About 9,000 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is Old Redwood HWY over Pruitt Creek?

The structure is 24 ft (7.3 m) long with a longest span of 11 ft (3.3 m) and a deck 41 ft wide.

Who owns Old Redwood HWY over Pruitt Creek?

It is owned by the County Highway Agency.