US Bridges

C.R. 90 over South Fork Willow Slough

Good

Yolo County, California · 0.37 MI S of S.H. 16 · Structure no. 22C0037

Built
1959
66 years old
Condition
Good
inspected November 2023
Type
Slab
Concrete Continuous
Length
93 ft
3 main spans
Daily traffic
234
2009 count
Owner
County
County Highway Agency

About this bridge

C.R. 90 over South Fork Willow Slough is a concrete continuous slab carrying C.R. 90 over South Fork Willow Slough in Yolo County, California. It was built in 1959, so it is 66 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 234 vehicles a day, roughly 3% of them trucks, projected to reach 326 by 2043. The structure is 93 ft (28.3 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesC.R. 90
CrossesSouth Fork Willow Slough
Location0.37 MI S of S.H. 16
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.67551, -121.95241
Functional classRural Local

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 protection8 Very GoodNo problems noted.
Last inspectionNovember 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 alignment6: Equal to present minimum criteria
Operating rating28.9 US tons
Inventory rating22.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length93 ft (28.3 m)
Longest span30 ft (9.1 m)
Deck width29 ft (8.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic234 (2009)
Projected traffic326 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 C.R. 90 over South Fork Willow Slough built?

It was built in 1959, making it 66 years old in 2025.

What condition is C.R. 90 over South Fork Willow Slough 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 November 2023.

How much traffic does C.R. 90 over South Fork Willow Slough carry?

About 234 vehicles per day (2009 count), of which roughly 3% are trucks.

How long is C.R. 90 over South Fork Willow Slough?

The structure is 93 ft (28.3 m) long with a longest span of 30 ft (9.1 m) and a deck 29 ft wide.

Who owns C.R. 90 over South Fork Willow Slough?

It is owned by the County Highway Agency.