US Bridges

State Route 178 EB over ST RTE 204 & Q Street

Fair

Kern County, California · 06-KER-178-R1.95-BKD · Structure no. 50 0326R

Built
1967
58 years old
Condition
Fair
inspected November 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
467 ft
2 main spans
Daily traffic
25,500
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 178 EB over ST RTE 204 & Q Street is a prestressed concrete continuous box beam or girders - multiple carrying State Route 178 EB over ST RTE 204 & Q Street 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 6 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 25,500 vehicles a day, roughly 6% of them trucks, projected to reach 74,685 by 2042. The structure is 467 ft (142.3 m) long and 52 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesState Route 178 EB
CrossesST RTE 204 & Q Street
Location06-KER-178-R1.95-BKD
RouteState Highway 178
Coordinates35.38146, -119.01074
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating65.4 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+5 approach)
Design loadHS 20 + Mod
Structure length467 ft (142.3 m)
Longest span99 ft (30.2 m)
Deck width52 ft (15.8 m)
Roadway width50 ft (15.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25,500 (2009)
Projected traffic74,685 by 2042
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

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 178 EB over ST RTE 204 & Q Street built?

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

What condition is State Route 178 EB over ST RTE 204 & Q Street 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 November 2024.

How much traffic does State Route 178 EB over ST RTE 204 & Q Street carry?

About 25,500 vehicles per day (2009 count), of which roughly 6% are trucks.

How long is State Route 178 EB over ST RTE 204 & Q Street?

The structure is 467 ft (142.3 m) long with a longest span of 99 ft (30.2 m) and a deck 52 ft wide.

Who owns State Route 178 EB over ST RTE 204 & Q Street?

It is owned by the State Highway Agency.