US Bridges

Bennett Valley RD over Matanzas Creek

Good

Sonoma County, California · 7.7 MI W Warm Springs RD · Structure no. 20C0220

Built
1929
96 years old
Condition
Good
inspected April 2024
Type
Tee Beam
Concrete
Length
53 ft
1 main span
Daily traffic
5,800
2015 count
Owner
County
County Highway Agency

About this bridge

Bennett Valley RD over Matanzas Creek is a concrete tee beam carrying Bennett Valley RD over Matanzas Creek in Sonoma County, California. It was built in 1929, so it is 96 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 5,800 vehicles a day, roughly 1% of them trucks, projected to reach 6,521 by 2046. The structure is 53 ft (16.2 m) long and 25 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesBennett Valley RD
CrossesMatanzas Creek
Location7.7 MI W Warm Springs RD
RouteCounty Highway 0
Coordinates38.414, -122.65753
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.3 US tons
Inventory rating29.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span50 ft (15.2 m)
Deck width25 ft (7.7 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,800 (2015)
Projected traffic6,521 by 2046
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Bennett Valley RD over Matanzas Creek built?

It was built in 1929, making it 96 years old in 2025.

What condition is Bennett Valley RD over Matanzas 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 April 2024.

How much traffic does Bennett Valley RD over Matanzas Creek carry?

About 5,800 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Bennett Valley RD over Matanzas Creek?

The structure is 53 ft (16.2 m) long with a longest span of 50 ft (15.2 m) and a deck 25 ft wide.

Who owns Bennett Valley RD over Matanzas Creek?

It is owned by the County Highway Agency.