US Bridges

Gephart Road over State Route 58

Good

Kern County, California · 09-KER-058-R137.77 · Structure no. 50 0354

Built
1971
54 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
254 ft
2 main spans
Daily traffic
175
2018 count
Owner
State
State Highway Agency

About this bridge

Gephart Road over State Route 58 is a prestressed concrete continuous box beam or girders - multiple carrying Gephart Road over State Route 58 in Kern County, California. It was built in 1971, so it is 54 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 175 vehicles a day, roughly 10% of them trucks, projected to reach 365 by 2040. The structure is 254 ft (77.4 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesGephart Road
CrossesState Route 58
Location09-KER-058-R137.77
RouteCounty Highway 0
Coordinates35.00717, -117.73924
Functional classRural Local

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.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating26.8 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span126 ft (38.4 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2018)
Projected traffic365 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Gephart Road over State Route 58 built?

It was built in 1971, making it 54 years old in 2025.

What condition is Gephart Road over State Route 58 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 June 2023.

How much traffic does Gephart Road over State Route 58 carry?

About 175 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Gephart Road over State Route 58?

The structure is 254 ft (77.4 m) long with a longest span of 126 ft (38.4 m) and a deck 42 ft wide.

Who owns Gephart Road over State Route 58?

It is owned by the State Highway Agency.