US Bridges

County Road 17 over Slough S7

Fair

Yolo County, California · 0.13 MI West of CR 95A · Structure no. 22C0054

Built
1930
95 years old
Condition
Fair
inspected January 2025
Type
Slab
Wood or Timber
Length
23 ft
1 main span
Daily traffic
580
2015 count
Owner
County
County Highway Agency

About this bridge

County Road 17 over Slough S7 is a wood or timber slab carrying County Road 17 over Slough S7 in Yolo County, California. It was built in 1930, so it is 95 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 580 vehicles a day, roughly 15% of them trucks, projected to reach 954 by 2047. The structure is 23 ft (7 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCounty Road 17
CrossesSlough S7
Location0.13 MI West of CR 95A
RouteCounty Highway 0
CountyYolo County
StateCalifornia
Coordinates38.73573, -121.85141
Functional classRural Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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 rating43.2 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length23 ft (7 m)
Longest span21 ft (6.4 m)
Deck width27 ft (8.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic580 (2015)
Projected traffic954 by 2047
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 17 over Slough S7 built?

It was built in 1930, making it 95 years old in 2025.

What condition is County Road 17 over Slough S7 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 2025.

How much traffic does County Road 17 over Slough S7 carry?

About 580 vehicles per day (2015 count), of which roughly 15% are trucks.

How long is County Road 17 over Slough S7?

The structure is 23 ft (7 m) long with a longest span of 21 ft (6.4 m) and a deck 27 ft wide.

Who owns County Road 17 over Slough S7?

It is owned by the County Highway Agency.