US Bridges

Hyperion Ave over Riverside Drive

Good

Los Angeles County, California · 0.05 MI W/O Fwy 5 · Structure no. 53C1882

Built
1929
96 years old
Condition
Good
inspected April 2024
Type
Arch - Deck
Concrete
Length
518 ft
3 main spans
Daily traffic
35,874
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hyperion Ave over Riverside Drive is a concrete arch - deck carrying Hyperion Ave over Riverside Drive in Los Angeles County, California. It was built in 1929, so it is 96 years old, older 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 35,874 vehicles a day, roughly 4% of them trucks, projected to reach 38,508 by 2044. The structure is 518 ft (158 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesHyperion Ave
CrossesRiverside Drive
Location0.05 MI W/O Fwy 5
RouteCity Street 0
Coordinates34.11183, -118.26816
Functional classUrban Other Principal Arterial

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating89.9 US tons
Inventory rating54 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length518 ft (158 m)
Longest span135 ft (41.1 m)
Deck width68 ft (20.8 m)
Roadway width55 ft (16.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,874 (2016)
Projected traffic38,508 by 2044
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Hyperion Ave over Riverside Drive built?

It was built in 1929, making it 96 years old in 2025.

What condition is Hyperion Ave over Riverside Drive 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 April 2024.

How much traffic does Hyperion Ave over Riverside Drive carry?

About 35,874 vehicles per day (2016 count), of which roughly 4% are trucks.

How long is Hyperion Ave over Riverside Drive?

The structure is 518 ft (158 m) long with a longest span of 135 ft (41.1 m) and a deck 68 ft wide.

Who owns Hyperion Ave over Riverside Drive?

It is owned by the City or Municipal Highway Agency.