US Bridges

Cheseboro RD over California Aqueduct

Good

Los Angeles County, California · 1.5MI S/O SR-138 HWY · Structure no. 53C1503

Built
1968
57 years old
Condition
Good
inspected July 2024
Type
Tee Beam
Concrete Continuous
Length
94 ft
2 main spans
Daily traffic
918
2017 count
Owner
County
County Highway Agency

About this bridge

Cheseboro RD over California Aqueduct is a concrete continuous tee beam carrying Cheseboro RD over California Aqueduct in Los Angeles County, California. It was built in 1968, so it is 57 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 918 vehicles a day, roughly 1% of them trucks, projected to reach 1,010 by 2041. The structure is 94 ft (28.5 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesCheseboro RD
CrossesCalifornia Aqueduct
Location1.5MI S/O SR-138 HWY
RouteCounty Highway 0WP85
Coordinates34.52724, -118.02758
Functional classUrban Collector

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.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.1 US tons
Inventory rating42.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length94 ft (28.5 m)
Longest span46 ft (14 m)
Deck width40 ft (12.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic918 (2017)
Projected traffic1,010 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 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 Cheseboro RD over California Aqueduct built?

It was built in 1968, making it 57 years old in 2025.

What condition is Cheseboro RD over California Aqueduct 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 July 2024.

How much traffic does Cheseboro RD over California Aqueduct carry?

About 918 vehicles per day (2017 count), of which roughly 1% are trucks.

How long is Cheseboro RD over California Aqueduct?

The structure is 94 ft (28.5 m) long with a longest span of 46 ft (14 m) and a deck 40 ft wide.

Who owns Cheseboro RD over California Aqueduct?

It is owned by the County Highway Agency.