US Bridges

70th ST W over California Aqueduct

Fair

Los Angeles County, California · 0.2MI S/O Ave N · Structure no. 53C1695

Built
1975
50 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
95 ft
1 main span
Daily traffic
1,122
2014 count
Owner
City
City or Municipal Highway Agency

About this bridge

70th ST W over California Aqueduct is a prestressed concrete stringer/multi-beam or girder carrying 70th ST W over California Aqueduct in Los Angeles County, California. It was built in 1975, so it is 50 years old, younger 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 6 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 1,122 vehicles a day, roughly 2% of them trucks, projected to reach 1,234 by 2044. The structure is 95 ft (29 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
Carries70th ST W
CrossesCalifornia Aqueduct
Location0.2MI S/O Ave N
RouteCity Street 0
CountyLos Angeles County
StateCalifornia
Coordinates34.63149, -118.25356
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length95 ft (29 m)
Longest span93 ft (28.3 m)
Deck width40 ft (12.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,122 (2014)
Projected traffic1,234 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 70th ST W over California Aqueduct built?

It was built in 1975, making it 50 years old in 2025.

What condition is 70th ST W over California Aqueduct 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 June 2024.

How much traffic does 70th ST W over California Aqueduct carry?

About 1,122 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is 70th ST W over California Aqueduct?

The structure is 95 ft (29 m) long with a longest span of 93 ft (28.3 m) and a deck 40 ft wide.

Who owns 70th ST W over California Aqueduct?

It is owned by the City or Municipal Highway Agency.