US Bridges

C.R. 99 over Dry Slough

Fair

Yolo County, California · 0.34 MI N of C.R.29 · Structure no. 22C0128

Built
1975
50 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
2,830
2009 count
Owner
County
County Highway Agency

About this bridge

C.R. 99 over Dry Slough is a concrete continuous slab carrying C.R. 99 over Dry Slough in Yolo County, California. It was built in 1975, so it is 50 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 2,830 vehicles a day, roughly 10% of them trucks, projected to reach 4,246 by 2043. The structure is 75 ft (22.9 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesC.R. 99
CrossesDry Slough
Location0.34 MI N of C.R.29
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.59515, -121.78553
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 protection8 Very GoodNo problems noted.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating102.2 US tons
Inventory rating61.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span24 ft (7.3 m)
Deck width33 ft (10 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,830 (2009)
Projected traffic4,246 by 2043
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 C.R. 99 over Dry Slough built?

It was built in 1975, making it 50 years old in 2025.

What condition is C.R. 99 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 C.R. 99 over Dry Slough carry?

About 2,830 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is C.R. 99 over Dry Slough?

The structure is 75 ft (22.9 m) long with a longest span of 24 ft (7.3 m) and a deck 33 ft wide.

Who owns C.R. 99 over Dry Slough?

It is owned by the County Highway Agency.