US Bridges

Lone Hill Ave over San Dimas Wash

Fair

Los Angeles County, California · 0.6MI S/O US-66 HWY · Structure no. 53C0780

Built
1962
63 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
37,389
2015 count
Owner
City
City or Municipal Highway Agency

About this bridge

Lone Hill Ave over San Dimas Wash is a concrete slab carrying Lone Hill Ave over San Dimas Wash in Los Angeles County, California. It was built in 1962, so it is 63 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 37,389 vehicles a day, roughly 2% of them trucks, projected to reach 44,867 by 2045. The structure is 23 ft (7 m) long and 92 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLone Hill Ave
CrossesSan Dimas Wash
Location0.6MI S/O US-66 HWY
RouteCity Street 0
CountyLos Angeles County
StateCalifornia
Coordinates34.11984, -117.8288
Functional classUrban Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating34.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width92 ft (28 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,389 (2015)
Projected traffic44,867 by 2045
Trucks2%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lone Hill Ave over San Dimas Wash built?

It was built in 1962, making it 63 years old in 2025.

What condition is Lone Hill Ave over San Dimas Wash 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 January 2025.

How much traffic does Lone Hill Ave over San Dimas Wash carry?

About 37,389 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Lone Hill Ave over San Dimas Wash?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 92 ft wide.

Who owns Lone Hill Ave over San Dimas Wash?

It is owned by the City or Municipal Highway Agency.