US Bridges

C.R. #25 over North Fork Willow Slough

Fair

Yolo County, California · 0.22 MI E of C.R. #95 · Structure no. 22C0116

Built
1930
95 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
32 ft
2 main spans
Daily traffic
145
2009 count
Owner
County
County Highway Agency

About this bridge

C.R. #25 over North Fork Willow Slough is a concrete continuous culvert carrying C.R. #25 over North Fork Willow Slough in Yolo County, California. It was built in 1930, so it is 95 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 145 vehicles a day, roughly 1% of them trucks, projected to reach 217 by 2043. The structure is 32 ft (9.8 m) long and 22 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesC.R. #25
CrossesNorth Fork Willow Slough
Location0.22 MI E of C.R. #95
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.64881, -121.85409
Functional classRural 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2 (+1 approach)
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic145 (2009)
Projected traffic217 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-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 C.R. #25 over North Fork Willow Slough built?

It was built in 1930, making it 95 years old in 2025.

What condition is C.R. #25 over North Fork Willow Slough 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 October 2023.

How much traffic does C.R. #25 over North Fork Willow Slough carry?

About 145 vehicles per day (2009 count), of which roughly 1% are trucks.

How long is C.R. #25 over North Fork Willow Slough?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 22 ft wide.

Who owns C.R. #25 over North Fork Willow Slough?

It is owned by the County Highway Agency.