US Bridges

Lerdo Highway over UP RR

Fair

Kern County, California · 0.2 MI E of Zerker RD · Structure no. 50C0039

Built
1961
64 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
216 ft
3 main spans
Daily traffic
10,110
2003 count
Owner
County
County Highway Agency

About this bridge

Lerdo Highway over UP RR is a prestressed concrete continuous stringer/multi-beam or girder carrying Lerdo Highway over UP RR in Kern County, California. It was built in 1961, so it is 64 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 10,110 vehicles a day, roughly 10% of them trucks, projected to reach 14,148 by 2042. The structure is 216 ft (65.8 m) long and 95 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

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CarriesLerdo Highway
CrossesUP RR
Location0.2 MI E of Zerker RD
RouteCounty Highway 0
CountyKern County
StateCalifornia
Coordinates35.4996, -119.16534
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.8 US tons
Inventory rating17.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length216 ft (65.8 m)
Longest span80 ft (24.4 m)
Deck width95 ft (28.9 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,110 (2003)
Projected traffic14,148 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed18 mi (29 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Lerdo Highway over UP RR built?

It was built in 1961, making it 64 years old in 2025.

What condition is Lerdo Highway over UP RR 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 Lerdo Highway over UP RR carry?

About 10,110 vehicles per day (2003 count), of which roughly 10% are trucks.

How long is Lerdo Highway over UP RR?

The structure is 216 ft (65.8 m) long with a longest span of 80 ft (24.4 m) and a deck 95 ft wide.

Who owns Lerdo Highway over UP RR?

It is owned by the County Highway Agency.