US Bridges

State Route 16 over South Fork Willow Slough

Good

Yolo County, California · 03-YOL-016-31.82 · Structure no. 22 0028

Built
1980
45 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete Continuous
Length
79 ft
3 main spans
Daily traffic
10,600
2017 count
Owner
State
State Highway Agency

About this bridge

State Route 16 over South Fork Willow Slough is a concrete continuous slab carrying State Route 16 over South Fork Willow Slough in Yolo County, California. It was built in 1980, so it is 45 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 10,600 vehicles a day, roughly 20% of them trucks, projected to reach 16,000 by 2040. The structure is 79 ft (24.2 m) long and 53 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesState Route 16
CrossesSouth Fork Willow Slough
Location03-YOL-016-31.82
RouteState Highway 16
CountyYolo County
StateCalifornia
Coordinates38.68012, -121.95608
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 protection7 GoodSome minor problems.
Last inspectionMarch 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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating31.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length79 ft (24.2 m)
Longest span26 ft (7.9 m)
Deck width53 ft (16.3 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,600 (2017)
Projected traffic16,000 by 2040
Trucks20%
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

OwnerState Highway Agency
Maintained byState 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 State Route 16 over South Fork Willow Slough built?

It was built in 1980, making it 45 years old in 2025.

What condition is State Route 16 over South Fork Willow 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 March 2023.

How much traffic does State Route 16 over South Fork Willow Slough carry?

About 10,600 vehicles per day (2017 count), of which roughly 20% are trucks.

How long is State Route 16 over South Fork Willow Slough?

The structure is 79 ft (24.2 m) long with a longest span of 26 ft (7.9 m) and a deck 53 ft wide.

Who owns State Route 16 over South Fork Willow Slough?

It is owned by the State Highway Agency.