US Bridges

Wilson Road over State Route 99

Poor

Kern County, California · 06-KER-099-22.11-BKD · Structure no. 50 0250

Built
1962
63 years old, rebuilt 1975
Condition
Poor
inspected October 2023
Type
Tee Beam
Concrete Continuous
Length
213 ft
4 main spans
Daily traffic
40,000
2018 count
Owner
State
State Highway Agency

About this bridge

Wilson Road over State Route 99 is a concrete continuous tee beam carrying Wilson Road over State Route 99 in Kern County, California. It was built in 1962 and reconstructed in 1975, so it is 63 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 40,000 vehicles a day, roughly 2% of them trucks, projected to reach 53,619 by 2045. The structure is 213 ft (64.9 m) long and 75 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesWilson Road
CrossesState Route 99
Location06-KER-099-22.11-BKD
RouteCity Street 0
Coordinates35.33212, -119.03998
Functional classUrban Minor Arterial

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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.9 US tons
Inventory rating27.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length213 ft (64.9 m)
Longest span71 ft (21.6 m)
Deck width75 ft (22.9 m)
Roadway width62 ft (19 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,000 (2018)
Projected traffic53,619 by 2045
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.5 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Wilson Road over State Route 99 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1975.

What condition is Wilson Road over State Route 99 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 October 2023.

How much traffic does Wilson Road over State Route 99 carry?

About 40,000 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is Wilson Road over State Route 99?

The structure is 213 ft (64.9 m) long with a longest span of 71 ft (21.6 m) and a deck 75 ft wide.

Who owns Wilson Road over State Route 99?

It is owned by the State Highway Agency.