US Bridges

County Line RD over Interstate 5

Good

Kern County, California · 06-KER-005-87.02 · Structure no. 50 0320

Built
1970
55 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
262 ft
2 main spans
Daily traffic
29
2008 count
Owner
State
State Highway Agency

About this bridge

County Line RD over Interstate 5 is a prestressed concrete continuous box beam or girders - multiple carrying County Line RD over Interstate 5 in Kern County, California. It was built in 1970, so it is 55 years old, older 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 29 vehicles a day, roughly 30% of them trucks, projected to reach 60 by 2044. The structure is 262 ft (79.9 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesCounty Line RD
CrossesInterstate 5
Location06-KER-005-87.02
RouteCounty Highway 0
Coordinates35.78965, -119.78288
Functional classRural Local

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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.1 US tons
Inventory rating20.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length262 ft (79.9 m)
Longest span131 ft (39.8 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29 (2008)
Projected traffic60 by 2044
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Line RD over Interstate 5 built?

It was built in 1970, making it 55 years old in 2025.

What condition is County Line RD over Interstate 5 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 October 2024.

How much traffic does County Line RD over Interstate 5 carry?

About 29 vehicles per day (2008 count), of which roughly 30% are trucks.

How long is County Line RD over Interstate 5?

The structure is 262 ft (79.9 m) long with a longest span of 131 ft (39.8 m) and a deck 34 ft wide.

Who owns County Line RD over Interstate 5?

It is owned by the State Highway Agency.