US Bridges

County Road 25 over Cottonwood Slough

Fair

Yolo County, California · 1.78 MI W of CO RD 86A · Structure no. 22C0075

Built
1932
93 years old, rebuilt 1956
Condition
Fair
inspected October 2023
Type
Truss - Thru
Steel
Length
112 ft
1 main span
Daily traffic
25
2003 count
Owner
County
County Highway Agency

About this bridge

County Road 25 over Cottonwood Slough is a steel truss - thru carrying County Road 25 over Cottonwood Slough in Yolo County, California. It was built in 1932 and reconstructed in 1956, so it is 93 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 25 vehicles a day, roughly 4% of them trucks, projected to reach 28 by 2041. The structure is 112 ft (34.1 m) long and 14 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty Road 25
CrossesCottonwood Slough
Location1.78 MI W of CO RD 86A
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.65029, -122.04932
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
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 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34 US tons
Inventory rating20.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length112 ft (34.1 m)
Longest span108 ft (32.9 m)
Deck width14 ft (4.2 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic25 (2003)
Projected traffic28 by 2041
Trucks4%
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 County Road 25 over Cottonwood Slough built?

It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1956.

What condition is County Road 25 over Cottonwood 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 County Road 25 over Cottonwood Slough carry?

About 25 vehicles per day (2003 count), of which roughly 4% are trucks.

How long is County Road 25 over Cottonwood Slough?

The structure is 112 ft (34.1 m) long with a longest span of 108 ft (32.9 m) and a deck 14 ft wide.

Who owns County Road 25 over Cottonwood Slough?

It is owned by the County Highway Agency.