US Bridges

170th ST W over California Aqueduct

Fair

Los Angeles County, California · 0.8MI S/O Lancaster RD · Structure no. 53C1496

Built
1967
58 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete Continuous
Length
97 ft
2 main spans
Daily traffic
101
2014 count
Owner
County
County Highway Agency

About this bridge

170th ST W over California Aqueduct is a concrete continuous tee beam carrying 170th ST W over California Aqueduct in Los Angeles County, California. It was built in 1967, so it is 58 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 101 vehicles a day, projected to reach 101 by 2044. The structure is 97 ft (29.6 m) long and 39 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries170th ST W
CrossesCalifornia Aqueduct
Location0.8MI S/O Lancaster RD
RouteCounty Highway OQ071
CountyLos Angeles County
StateCalifornia
Coordinates34.7209, -118.42993
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating34.3 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length97 ft (29.6 m)
Longest span48 ft (14.6 m)
Deck width39 ft (11.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic101 (2014)
Projected traffic101 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 170th ST W over California Aqueduct built?

It was built in 1967, making it 58 years old in 2025.

What condition is 170th 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 May 2024.

How much traffic does 170th ST W over California Aqueduct carry?

About 101 vehicles per day (2014 count).

How long is 170th ST W over California Aqueduct?

The structure is 97 ft (29.6 m) long with a longest span of 48 ft (14.6 m) and a deck 39 ft wide.

Who owns 170th ST W over California Aqueduct?

It is owned by the County Highway Agency.