US Bridges

N605-FIRESTONE Bld over Imperial HWY On-Ramp

Good

Los Angeles County, California · 07-LA-605-R7.84-NRW · Structure no. 53 1651T

Built
1993
32 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
565 ft
6 main spans
Daily traffic
8,100
2021 count
Owner
State
State Highway Agency

About this bridge

N605-FIRESTONE Bld over Imperial HWY On-Ramp is a prestressed concrete continuous box beam or girders - multiple carrying N605-FIRESTONE Bld over Imperial HWY On-Ramp 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 8,100 vehicles a day, roughly 2% of them trucks, projected to reach 9,492 by 2042. The structure is 565 ft (172.2 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesN605-FIRESTONE Bld
CrossesImperial HWY On-Ramp
Location07-LA-605-R7.84-NRW
RouteInterstate 605
Coordinates33.91586, -118.10403
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 geometry7: Better than 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 spans6
Design loadHS 20 + Mod
Structure length565 ft (172.2 m)
Longest span111 ft (33.8 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,100 (2021)
Projected traffic9,492 by 2042
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 N605-FIRESTONE Bld over Imperial HWY On-Ramp built?

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

What condition is N605-FIRESTONE Bld over Imperial HWY On-Ramp 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 N605-FIRESTONE Bld over Imperial HWY On-Ramp carry?

About 8,100 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is N605-FIRESTONE Bld over Imperial HWY On-Ramp?

The structure is 565 ft (172.2 m) long with a longest span of 111 ft (33.8 m) and a deck 28 ft wide.

Who owns N605-FIRESTONE Bld over Imperial HWY On-Ramp?

It is owned by the State Highway Agency.