US Bridges

Interstate 210 over Mountain Avenue

Fair

Los Angeles County, California · 07-LA-210-R34.74-MNRO · Structure no. 53 1821

Built
1966
59 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
92 ft
1 main span
Daily traffic
258,000
2017 count
Owner
State
State Highway Agency

About this bridge

Interstate 210 over Mountain Avenue is a concrete box beam or girders - multiple carrying Interstate 210 over Mountain Avenue in Los Angeles County, California. It was built in 1966, so it is 59 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 258,000 vehicles a day, roughly 8% of them trucks, projected to reach 278,330 by 2043. The structure is 92 ft (27.9 m) long and 154 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterstate 210
CrossesMountain Avenue
Location07-LA-210-R34.74-MNRO
RouteInterstate 210
CountyLos Angeles County
StateCalifornia
Coordinates34.13526, -117.9865
Functional classUrban Principal Arterial - Interstate

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
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 geometry9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length92 ft (27.9 m)
Longest span89 ft (27.1 m)
Deck width154 ft (46.9 m)
Roadway width149 ft (45.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic258,000 (2017)
Projected traffic278,330 by 2043
Trucks8%
Lanes on structure10
Traffic directionTwo-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 Interstate 210 over Mountain Avenue built?

It was built in 1966, making it 59 years old in 2025.

What condition is Interstate 210 over Mountain Avenue 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 April 2023.

How much traffic does Interstate 210 over Mountain Avenue carry?

About 258,000 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is Interstate 210 over Mountain Avenue?

The structure is 92 ft (27.9 m) long with a longest span of 89 ft (27.1 m) and a deck 154 ft wide.

Who owns Interstate 210 over Mountain Avenue?

It is owned by the State Highway Agency.