US Bridges

Zerker RD over Calloway Canal

Fair

Kern County, California · 1.8 MI N 7th Standard RD · Structure no. 50C0254

Built
1961
64 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete Continuous
Length
87 ft
3 main spans
Daily traffic
2,650
2007 count
Owner
County
County Highway Agency

About this bridge

Zerker RD over Calloway Canal is a concrete continuous slab carrying Zerker RD over Calloway Canal in Kern County, California. It was built in 1961, so it is 64 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 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 2,650 vehicles a day, roughly 5% of them trucks, projected to reach 2,173 by 2045. The structure is 87 ft (26.5 m) long and 37 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesZerker RD
CrossesCalloway Canal
Location1.8 MI N 7th Standard RD
RouteCounty Highway 0
CountyKern County
StateCalifornia
Coordinates35.46821, -119.15347
Functional classUrban Minor Arterial

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating69.3 US tons
Inventory rating41.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length87 ft (26.5 m)
Longest span34 ft (10.4 m)
Deck width37 ft (11.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,650 (2007)
Projected traffic2,173 by 2045
Trucks5%
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 Zerker RD over Calloway Canal built?

It was built in 1961, making it 64 years old in 2025.

What condition is Zerker RD over Calloway 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 November 2024.

How much traffic does Zerker RD over Calloway Canal carry?

About 2,650 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is Zerker RD over Calloway Canal?

The structure is 87 ft (26.5 m) long with a longest span of 34 ft (10.4 m) and a deck 37 ft wide.

Who owns Zerker RD over Calloway Canal?

It is owned by the County Highway Agency.