US Bridges

State Route 58 EB over Mt Vernon Avenue

Good

Kern County, California · 06-KER-058-R56.41 · Structure no. 50 0392R

Built
1974
51 years old, rebuilt 2004
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
152 ft
1 main span
Daily traffic
35,500
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 58 EB over Mt Vernon Avenue is a prestressed concrete box beam or girders - multiple carrying State Route 58 EB over Mt Vernon Avenue in Kern County, California. It was built in 1974 and reconstructed in 2004, so it is 51 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 35,500 vehicles a day, roughly 25% of them trucks, projected to reach 49,092 by 2045. The structure is 152 ft (46.3 m) long and 59 ft wide.

CarriesState Route 58 EB
CrossesMt Vernon Avenue
Location06-KER-058-R56.41
RouteState Highway 58
Coordinates35.35279, -118.96782
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length152 ft (46.3 m)
Longest span152 ft (46.3 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,500 (2019)
Projected traffic49,092 by 2045
Trucks25%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 State Route 58 EB over Mt Vernon Avenue built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 2004.

What condition is State Route 58 EB over Mt Vernon Avenue 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 September 2023.

How much traffic does State Route 58 EB over Mt Vernon Avenue carry?

About 35,500 vehicles per day (2019 count), of which roughly 25% are trucks.

How long is State Route 58 EB over Mt Vernon Avenue?

The structure is 152 ft (46.3 m) long with a longest span of 152 ft (46.3 m) and a deck 59 ft wide.

Who owns State Route 58 EB over Mt Vernon Avenue?

It is owned by the State Highway Agency.