US Bridges

Kenilworth Ave over Sonoma Creek

Fair

Sonoma County, California · 0.1 MI W Merwin Ave · Structure no. 20C0269

Built
1971
54 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
97 ft
3 main spans
Daily traffic
100
2015 count
Owner
County
County Highway Agency

About this bridge

Kenilworth Ave over Sonoma Creek is a concrete continuous slab carrying Kenilworth Ave over Sonoma Creek in Sonoma County, California. It was built in 1971, so it is 54 years old, younger 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 100 vehicles a day, roughly 2% of them trucks, projected to reach 177 by 2040. The structure is 97 ft (29.6 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesKenilworth Ave
CrossesSonoma Creek
Location0.1 MI W Merwin Ave
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.41095, -122.55394
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating42.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length97 ft (29.6 m)
Longest span38 ft (11.6 m)
Deck width14 ft (4.3 m)
Roadway width13 ft (4.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2015)
Projected traffic177 by 2040
Trucks2%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 Kenilworth Ave over Sonoma Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Kenilworth Ave over Sonoma 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 May 2023.

How much traffic does Kenilworth Ave over Sonoma Creek carry?

About 100 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Kenilworth Ave over Sonoma Creek?

The structure is 97 ft (29.6 m) long with a longest span of 38 ft (11.6 m) and a deck 14 ft wide.

Who owns Kenilworth Ave over Sonoma Creek?

It is owned by the County Highway Agency.