US Bridges

County Road 31 over Dry Slough

Good

Yolo County, California · 0.2 MI West of C.R. #96 · Structure no. 22C0080

Built
1959
66 years old, rebuilt 1981
Condition
Good
inspected November 2023
Type
Slab
Concrete Continuous
Length
69 ft
3 main spans
Daily traffic
5,083
2012 count
Owner
County
County Highway Agency

About this bridge

County Road 31 over Dry Slough is a concrete continuous slab carrying County Road 31 over Dry Slough in Yolo County, California. It was built in 1959 and reconstructed in 1981, 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 5,083 vehicles a day, roughly 7% of them trucks, projected to reach 6,244 by 2043. The structure is 69 ft (21 m) long and 41 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Road 31
CrossesDry Slough
Location0.2 MI West of C.R. #96
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.56152, -121.84637
Functional classRural Minor Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.9 US tons
Inventory rating32.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length69 ft (21 m)
Longest span22 ft (6.7 m)
Deck width41 ft (12.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,083 (2012)
Projected traffic6,244 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 31 over Dry Slough built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1981.

What condition is County Road 31 over Dry 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 County Road 31 over Dry Slough carry?

About 5,083 vehicles per day (2012 count), of which roughly 7% are trucks.

How long is County Road 31 over Dry Slough?

The structure is 69 ft (21 m) long with a longest span of 22 ft (6.7 m) and a deck 41 ft wide.

Who owns County Road 31 over Dry Slough?

It is owned by the County Highway Agency.