US Bridges

Twin Cities RD over West Slough

Good

Sacramento County, California · 3.1 MI W Christensen RD · Structure no. 24C0184

Built
1983
42 years old
Condition
Good
inspected October 2022
Type
Slab
Concrete Continuous
Length
182 ft
6 main spans
Daily traffic
4,285
2009 count
Owner
County
County Highway Agency

About this bridge

Twin Cities RD over West Slough is a concrete continuous slab carrying Twin Cities RD over West Slough in Sacramento County, California. It was built in 1983, so it is 42 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 4,285 vehicles a day, roughly 10% of them trucks, projected to reach 5,271 by 2039. The structure is 182 ft (55.5 m) long and 37 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

CarriesTwin Cities RD
CrossesWest Slough
Location3.1 MI W Christensen RD
RouteCounty Highway 0
Coordinates38.29062, -121.39479
Functional classRural Major Collector

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 inspectionOctober 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length182 ft (55.5 m)
Longest span30 ft (9.1 m)
Deck width37 ft (11.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,285 (2009)
Projected traffic5,271 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 Twin Cities RD over West Slough built?

It was built in 1983, making it 42 years old in 2025.

What condition is Twin Cities RD over West 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 October 2022.

How much traffic does Twin Cities RD over West Slough carry?

About 4,285 vehicles per day (2009 count), of which roughly 10% are trucks.

How long is Twin Cities RD over West Slough?

The structure is 182 ft (55.5 m) long with a longest span of 30 ft (9.1 m) and a deck 37 ft wide.

Who owns Twin Cities RD over West Slough?

It is owned by the County Highway Agency.