US Bridges

County Road 98 over Willow Slough

Fair

Yolo County, California · 1.3 MI N of CO Road #29 · Structure no. 22C0027

Built
1959
66 years old, rebuilt 2013
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
85 ft
3 main spans
Daily traffic
6,160
2009 count
Owner
County
County Highway Agency

About this bridge

County Road 98 over Willow Slough is a concrete continuous slab carrying County Road 98 over Willow Slough in Yolo County, California. It was built in 1959 and reconstructed in 2013, 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 6,160 vehicles a day, roughly 10% of them trucks, projected to reach 7,857 by 2045. The structure is 85 ft (25.9 m) long and 45 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty Road 98
CrossesWillow Slough
Location1.3 MI N of CO Road #29
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.61038, -121.80289
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 protection7 GoodSome minor problems.
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span30 ft (9.1 m)
Deck width45 ft (13.6 m)
Roadway width42 ft (12.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,160 (2009)
Projected traffic7,857 by 2045
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 98 over Willow Slough built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 2013.

What condition is County Road 98 over Willow 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 98 over Willow Slough carry?

About 6,160 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is County Road 98 over Willow Slough?

The structure is 85 ft (25.9 m) long with a longest span of 30 ft (9.1 m) and a deck 45 ft wide.

Who owns County Road 98 over Willow Slough?

It is owned by the County Highway Agency.