US Bridges

Tupman Road over Westside Canal

Fair

Kern County, California · 1.4 MI S of Station Road · Structure no. 50C0201

Built
1972
53 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
122 ft
4 main spans
Daily traffic
460
2007 count
Owner
County
County Highway Agency

About this bridge

Tupman Road over Westside Canal is a concrete continuous slab carrying Tupman Road over Westside Canal in Kern County, California. It was built in 1972, so it is 53 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 6 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 460 vehicles a day, roughly 15% of them trucks, projected to reach 536 by 2041. The structure is 122 ft (37.2 m) long and 41 ft wide. If it were closed, the detour would be 13.7 mi (22 km).

Location

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CarriesTupman Road
CrossesWestside Canal
Location1.4 MI S of Station Road
RouteCounty Highway 0
CountyKern County
StateCalifornia
Coordinates35.31363, -119.37668
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length122 ft (37.2 m)
Longest span30 ft (9.1 m)
Deck width41 ft (12.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic460 (2007)
Projected traffic536 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13.7 mi (22 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 Tupman Road over Westside Canal built?

It was built in 1972, making it 53 years old in 2025.

What condition is Tupman Road over Westside Canal 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 March 2023.

How much traffic does Tupman Road over Westside Canal carry?

About 460 vehicles per day (2007 count), of which roughly 15% are trucks.

How long is Tupman Road over Westside Canal?

The structure is 122 ft (37.2 m) long with a longest span of 30 ft (9.1 m) and a deck 41 ft wide.

Who owns Tupman Road over Westside Canal?

It is owned by the County Highway Agency.