US Bridges

Canyon RD over Canyon Creek

Fair

Sonoma County, California · 0.4 MI E JCT Dry Creek RD · Structure no. 20C0442

Built
1928
97 years old, rebuilt 1962
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete
Length
23 ft
1 main span
Daily traffic
416
2010 count
Owner
County
County Highway Agency

About this bridge

Canyon RD over Canyon Creek is a concrete tee beam carrying Canyon RD over Canyon Creek in Sonoma County, California. It was built in 1928 and reconstructed in 1962, so it is 97 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 416 vehicles a day, roughly 1% of them trucks, projected to reach 968 by 2043. The structure is 23 ft (7 m) long and 40 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesCanyon RD
CrossesCanyon Creek
Location0.4 MI E JCT Dry Creek RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.70394, -122.9463
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.8 US tons
Inventory rating18.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width40 ft (12.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic416 (2010)
Projected traffic968 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 Canyon RD over Canyon Creek built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1962.

What condition is Canyon RD over Canyon 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 Canyon RD over Canyon Creek carry?

About 416 vehicles per day (2010 count), of which roughly 1% are trucks.

How long is Canyon RD over Canyon Creek?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 40 ft wide.

Who owns Canyon RD over Canyon Creek?

It is owned by the County Highway Agency.