US Bridges

18th Street over Kern Island Canal

Good

Kern County, California · East of R Street · Structure no. 50C0377

Built
2008
17 years old
Condition
Good
inspected December 2021
Type
Arch - Deck
Concrete
Length
24 ft
1 main span
Daily traffic
5,000
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

18th Street over Kern Island Canal is a concrete arch - deck carrying 18th Street over Kern Island Canal in Kern County, California. It was built in 2008, so it is 17 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 5,000 vehicles a day, roughly 3% of them trucks, projected to reach 7,582 by 2043. The structure is 24 ft (7.4 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Carries18th Street
CrossesKern Island Canal
LocationEast of R Street
RouteCity Street 0
Coordinates35.37513, -119.00856
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length24 ft (7.4 m)
Longest span24 ft (7.4 m)
Deck width43 ft (13 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2010)
Projected traffic7,582 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 18th Street over Kern Island Canal built?

It was built in 2008, making it 17 years old in 2025.

What condition is 18th Street over Kern Island Canal 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 December 2021.

How much traffic does 18th Street over Kern Island Canal carry?

About 5,000 vehicles per day (2010 count), of which roughly 3% are trucks.

How long is 18th Street over Kern Island Canal?

The structure is 24 ft (7.4 m) long with a longest span of 24 ft (7.4 m) and a deck 43 ft wide.

Who owns 18th Street over Kern Island Canal?

It is owned by the City or Municipal Highway Agency.