US Bridges

County Road 31 over Dry Slough

Fair

Yolo County, California · Just East of C.R. #95 · Structure no. 22C0079

Built
1959
66 years old, rebuilt 1977
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
87 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 1977, 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 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 5,083 vehicles a day, roughly 7% of them trucks, projected to reach 15,612 by 2043. The structure is 87 ft (26.5 m) long and 41 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Road 31
CrossesDry Slough
LocationJust East of C.R. #95
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.56152, -121.85665
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating41.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span28 ft (8.5 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 traffic15,612 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 1977.

What condition is County Road 31 over Dry 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 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 87 ft (26.5 m) long with a longest span of 28 ft (8.5 m) and a deck 41 ft wide.

Who owns County Road 31 over Dry Slough?

It is owned by the County Highway Agency.