US Bridges

State Route 178 over U.S. Highway 395

Good

Kern County, California · 09-KER-178-R93.23 · Structure no. 50 0438

Built
1974
51 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
108 ft
2 main spans
Daily traffic
14,600
2018 count
Owner
State
State Highway Agency

About this bridge

State Route 178 over U.S. Highway 395 is a prestressed concrete continuous box beam or girders - multiple carrying State Route 178 over U.S. Highway 395 in Kern County, California. It was built in 1974, 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 14,600 vehicles a day, roughly 8% of them trucks, projected to reach 21,098 by 2040. The structure is 108 ft (32.9 m) long and 44 ft wide.

CarriesState Route 178
CrossesU.S. Highway 395
Location09-KER-178-R93.23
RouteState Highway 178
Coordinates35.65134, -117.8008
Functional classRural Principal Arterial - Other

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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating31.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length108 ft (32.9 m)
Longest span100 ft (30.5 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,600 (2018)
Projected traffic21,098 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 over U.S. Highway 395 built?

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

What condition is State Route 178 over U.S. Highway 395 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 State Route 178 over U.S. Highway 395 carry?

About 14,600 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is State Route 178 over U.S. Highway 395?

The structure is 108 ft (32.9 m) long with a longest span of 100 ft (30.5 m) and a deck 44 ft wide.

Who owns State Route 178 over U.S. Highway 395?

It is owned by the State Highway Agency.