US Bridges

Imperial HWY over Wilmington Ave / Mta

Fair

Los Angeles County, California · 0.8MI W/O Alameda ST · Structure no. 53C1914

Built
2004
21 years old
Condition
Fair
inspected February 2025
Type
Box Beam or Girders - Single or Spread
Concrete
Length
1,086 ft
9 main spans
Daily traffic
37,956
2015 count
Owner
County
County Highway Agency

About this bridge

Imperial HWY over Wilmington Ave / Mta is a concrete box beam or girders - single or spread carrying Imperial HWY over Wilmington Ave / Mta in Los Angeles County, California. It was built in 2004, so it is 21 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 37,956 vehicles a day, roughly 5% of them trucks, projected to reach 45,547 by 2045. The structure is 1,086 ft (331 m) long and 76 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesImperial HWY
CrossesWilmington Ave / Mta
Location0.8MI W/O Alameda ST
RouteCounty Highway 0
CountyLos Angeles County
StateCalifornia
Coordinates33.92941, -118.24031
Functional classUrban Other Principal 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating40.3 US tons
Inventory rating25.7 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete
DeckConcrete, cast-in-place
Main spans9
Design loadHS 20 + Mod
Structure length1,086 ft (331 m)
Longest span143 ft (43.6 m)
Deck width76 ft (23.3 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,956 (2015)
Projected traffic45,547 by 2045
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

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 Imperial HWY over Wilmington Ave / Mta built?

It was built in 2004, making it 21 years old in 2025.

What condition is Imperial HWY over Wilmington Ave / Mta 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 February 2025.

How much traffic does Imperial HWY over Wilmington Ave / Mta carry?

About 37,956 vehicles per day (2015 count), of which roughly 5% are trucks.

How long is Imperial HWY over Wilmington Ave / Mta?

The structure is 1,086 ft (331 m) long with a longest span of 143 ft (43.6 m) and a deck 76 ft wide.

Who owns Imperial HWY over Wilmington Ave / Mta?

It is owned by the County Highway Agency.