US Bridges

State Route 99 over High ST & UP RR

Poor

Kern County, California · 06-KER-099-57.10-DLN · Structure no. 50 0214

Built
1955
70 years old, rebuilt 2000
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
666 ft
6 main spans
Daily traffic
53,000
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 99 over High ST & UP RR is a steel stringer/multi-beam or girder carrying State Route 99 over High ST & UP RR in Kern County, California. It was built in 1955 and reconstructed in 2000, so it is 70 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 53,000 vehicles a day, roughly 28% of them trucks, projected to reach 105,814 by 2042. The structure is 666 ft (203 m) long and 117 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesState Route 99
CrossesHigh ST & UP RR
Location06-KER-099-57.10-DLN
RouteState Highway 99
CountyKern County
StateCalifornia
Coordinates35.78359, -119.25197
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.5 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length666 ft (203 m)
Longest span110 ft (33.5 m)
Deck width117 ft (35.8 m)
Roadway width112 ft (34 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53,000 (2009)
Projected traffic105,814 by 2042
Trucks28%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.9 mi (3 km)
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$12.2 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 99 over High ST & UP RR built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2000.

What condition is State Route 99 over High ST & UP RR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does State Route 99 over High ST & UP RR carry?

About 53,000 vehicles per day (2009 count), of which roughly 28% are trucks.

How long is State Route 99 over High ST & UP RR?

The structure is 666 ft (203 m) long with a longest span of 110 ft (33.5 m) and a deck 117 ft wide.

Who owns State Route 99 over High ST & UP RR?

It is owned by the State Highway Agency.