US Bridges

County Road 31 over Chickhominy Slough

Good

Yolo County, California · 0.27 MI W of C.R. 91A · Structure no. 22C0118

Built
1976
49 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete
Length
30 ft
1 main span
Daily traffic
586
2009 count
Owner
County
County Highway Agency

About this bridge

County Road 31 over Chickhominy Slough is a concrete slab carrying County Road 31 over Chickhominy Slough in Yolo County, California. It was built in 1976, so it is 49 years old, younger 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 586 vehicles a day, roughly 15% of them trucks, projected to reach 639 by 2043. The structure is 30 ft (9.1 m) long and 29 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCounty Road 31
CrossesChickhominy Slough
Location0.27 MI W of C.R. 91A
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.5619, -121.93457
Functional classRural Minor Collector

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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating110 US tons
Inventory rating82.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width29 ft (8.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic586 (2009)
Projected traffic639 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Chickhominy Slough built?

It was built in 1976, making it 49 years old in 2025.

What condition is County Road 31 over Chickhominy 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 October 2023.

How much traffic does County Road 31 over Chickhominy Slough carry?

About 586 vehicles per day (2009 count), of which roughly 15% are trucks.

How long is County Road 31 over Chickhominy Slough?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 29 ft wide.

Who owns County Road 31 over Chickhominy Slough?

It is owned by the County Highway Agency.