US Bridges

IMPERIAL-S605 Rmp over Imperial Highway

Good

Los Angeles County, California · 07-LA-605-R7.85-NRW · Structure no. 53 1651K

Built
1993
32 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
156 ft
2 main spans
Daily traffic
26,260
2021 count
Owner
State
State Highway Agency

About this bridge

IMPERIAL-S605 Rmp over Imperial Highway is a prestressed concrete continuous box beam or girders - multiple carrying IMPERIAL-S605 Rmp over Imperial Highway in Los Angeles County, California. It was built in 1993, so it is 32 years old, younger 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 26,260 vehicles a day, roughly 6% of them trucks, projected to reach 30,909 by 2042. The structure is 156 ft (47.5 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIMPERIAL-S605 Rmp
CrossesImperial Highway
Location07-LA-605-R7.85-NRW
RouteInterstate 605
Coordinates33.91689, -118.10509
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length156 ft (47.5 m)
Longest span79 ft (24.1 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,260 (2021)
Projected traffic30,909 by 2042
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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-S605 Rmp over Imperial Highway built?

It was built in 1993, making it 32 years old in 2025.

What condition is IMPERIAL-S605 Rmp over Imperial Highway 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 August 2023.

How much traffic does IMPERIAL-S605 Rmp over Imperial Highway carry?

About 26,260 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is IMPERIAL-S605 Rmp over Imperial Highway?

The structure is 156 ft (47.5 m) long with a longest span of 79 ft (24.1 m) and a deck 35 ft wide.

Who owns IMPERIAL-S605 Rmp over Imperial Highway?

It is owned by the State Highway Agency.