US Bridges

State Route 58 over California Aqueduct

Fair

Kern County, California · 06-KER-058-23.03 · Structure no. 50 0358

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
160 ft
2 main spans
Daily traffic
1,250
2016 count
Owner
State
State Highway Agency

About this bridge

State Route 58 over California Aqueduct is a concrete continuous box beam or girders - multiple carrying State Route 58 over California Aqueduct in Kern County, California. It was built in 1967, so it is 58 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 1,250 vehicles a day, roughly 30% of them trucks, projected to reach 1,500 by 2040. The structure is 160 ft (48.8 m) long and 34 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesState Route 58
CrossesCalifornia Aqueduct
Location06-KER-058-23.03
RouteState Highway 58
CountyKern County
StateCalifornia
Coordinates35.39084, -119.54531
Functional classRural 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
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 protection8 Very GoodNo problems noted.
Last inspectionMay 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length160 ft (48.8 m)
Longest span80 ft (24.4 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,250 (2016)
Projected traffic1,500 by 2040
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 State Route 58 over California Aqueduct built?

It was built in 1967, making it 58 years old in 2025.

What condition is State Route 58 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 May 2023.

How much traffic does State Route 58 over California Aqueduct carry?

About 1,250 vehicles per day (2016 count), of which roughly 30% are trucks.

How long is State Route 58 over California Aqueduct?

The structure is 160 ft (48.8 m) long with a longest span of 80 ft (24.4 m) and a deck 34 ft wide.

Who owns State Route 58 over California Aqueduct?

It is owned by the State Highway Agency.