US Bridges

County Road #105 over Willow Slough Bypass

Fair

Yolo County, California · Just North of C.R. # 29 · Structure no. 22C0146

Built
1976
49 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
330 ft
11 main spans
Daily traffic
700
2014 count
Owner
County
County Highway Agency

About this bridge

County Road #105 over Willow Slough Bypass is a concrete continuous slab carrying County Road #105 over Willow Slough Bypass 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 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 700 vehicles a day, roughly 25% of them trucks, projected to reach 1,345 by 2042. The structure is 330 ft (100.5 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesCounty Road #105
CrossesWillow Slough Bypass
LocationJust North of C.R. # 29
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.58962, -121.67483
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103.6 US tons
Inventory rating62.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadHS 20 + Mod
Structure length330 ft (100.5 m)
Longest span32 ft (9.7 m)
Deck width29 ft (8.7 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2014)
Projected traffic1,345 by 2042
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 #105 over Willow Slough Bypass built?

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

What condition is County Road #105 over Willow Slough Bypass 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 January 2024.

How much traffic does County Road #105 over Willow Slough Bypass carry?

About 700 vehicles per day (2014 count), of which roughly 25% are trucks.

How long is County Road #105 over Willow Slough Bypass?

The structure is 330 ft (100.5 m) long with a longest span of 32 ft (9.7 m) and a deck 29 ft wide.

Who owns County Road #105 over Willow Slough Bypass?

It is owned by the County Highway Agency.