US Bridges

Brown-Inyokern RD over Airport Wash

Fair

Kern County, California · 1.2 MI N of RTE 178 · Structure no. 50C0077

Built
1945
80 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
2,050
2007 count
Owner
County
County Highway Agency

About this bridge

Brown-Inyokern RD over Airport Wash is a concrete slab carrying Brown-Inyokern RD over Airport Wash in Kern County, California. It was built in 1945, so it is 80 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 5 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 2,050 vehicles a day, roughly 10% of them trucks, projected to reach 2,653 by 2046. The structure is 24 ft (7.3 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBrown-Inyokern RD
CrossesAirport Wash
Location1.2 MI N of RTE 178
RouteCounty Highway 0
CountyKern County
StateCalifornia
Coordinates35.66218, -117.81682
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length24 ft (7.3 m)
Longest span20 ft (6.1 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,050 (2007)
Projected traffic2,653 by 2046
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Brown-Inyokern RD over Airport Wash built?

It was built in 1945, making it 80 years old in 2025.

What condition is Brown-Inyokern RD over Airport Wash 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 Brown-Inyokern RD over Airport Wash carry?

About 2,050 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is Brown-Inyokern RD over Airport Wash?

The structure is 24 ft (7.3 m) long with a longest span of 20 ft (6.1 m) and a deck 35 ft wide.

Who owns Brown-Inyokern RD over Airport Wash?

It is owned by the County Highway Agency.