US Bridges

Gardner Field Road over California Aqueduct

Fair

Kern County, California · 0.5 MI East of Duvall ST · Structure no. 50C0126

Built
1968
57 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete Continuous
Length
166 ft
2 main spans
Daily traffic
1,072
2011 count
Owner
State
Other State Agency

About this bridge

Gardner Field Road over California Aqueduct is a concrete continuous tee beam carrying Gardner Field Road over California Aqueduct in Kern County, California. It was built in 1968, so it is 57 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 1,072 vehicles a day, roughly 15% of them trucks, projected to reach 2,081 by 2041. The structure is 166 ft (50.7 m) long and 34 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesGardner Field Road
CrossesCalifornia Aqueduct
Location0.5 MI East of Duvall ST
RouteCounty Highway 0
CountyKern County
StateCalifornia
Coordinates35.12981, -119.36879
Functional classRural Major 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
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 protection9 ExcellentNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.1 US tons
Inventory rating28.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length166 ft (50.7 m)
Longest span82 ft (25.1 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,072 (2011)
Projected traffic2,081 by 2041
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther State 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 Gardner Field Road over California Aqueduct built?

It was built in 1968, making it 57 years old in 2025.

What condition is Gardner Field Road over California Aqueduct 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 Gardner Field Road over California Aqueduct carry?

About 1,072 vehicles per day (2011 count), of which roughly 15% are trucks.

How long is Gardner Field Road over California Aqueduct?

The structure is 166 ft (50.7 m) long with a longest span of 82 ft (25.1 m) and a deck 34 ft wide.

Who owns Gardner Field Road over California Aqueduct?

It is owned by the Other State Agency and maintained by the County Highway Agency.