US Bridges

Lake Isabella RD over Borel Canal

Fair

Kern County, California · 0.75 MI N of Nugget Ave · Structure no. 50C0172

Built
1948
77 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
74 ft
1 main span
Daily traffic
5,400
2007 count
Owner
County
County Highway Agency

About this bridge

Lake Isabella RD over Borel Canal is a steel stringer/multi-beam or girder carrying Lake Isabella RD over Borel Canal in Kern County, California. It was built in 1948, so it is 77 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 5,400 vehicles a day, roughly 5% of them trucks, projected to reach 8,989 by 2046. The structure is 74 ft (22.6 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesLake Isabella RD
CrossesBorel Canal
Location0.75 MI N of Nugget Ave
RouteCounty Highway 0
CountyKern County
StateCalifornia
Coordinates35.6362, -118.47016
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating45 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span68 ft (20.7 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,400 (2007)
Projected traffic8,989 by 2046
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Lake Isabella RD over Borel Canal built?

It was built in 1948, making it 77 years old in 2025.

What condition is Lake Isabella RD over Borel Canal 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 Lake Isabella RD over Borel Canal carry?

About 5,400 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is Lake Isabella RD over Borel Canal?

The structure is 74 ft (22.6 m) long with a longest span of 68 ft (20.7 m) and a deck 33 ft wide.

Who owns Lake Isabella RD over Borel Canal?

It is owned by the County Highway Agency.