US Bridges

Arrow HWY over San Dimas Wash

Fair

Los Angeles County, California · 0.3MI W/O I-10 Fwy · Structure no. 53C0441

Built
1959
66 years old
Condition
Fair
inspected September 2023
Type
Frame
Concrete
Length
80 ft
1 main span
Daily traffic
26,036
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

Arrow HWY over San Dimas Wash is a concrete frame carrying Arrow HWY over San Dimas Wash in Los Angeles County, California. It was built in 1959, so it is 66 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 26,036 vehicles a day, roughly 4% of them trucks, projected to reach 31,244 by 2041. The structure is 80 ft (24.4 m) long and 95 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesArrow HWY
CrossesSan Dimas Wash
Location0.3MI W/O I-10 Fwy
RouteCity Street 0L528
CountyLos Angeles County
StateCalifornia
Coordinates34.10564, -117.87661
Functional classUrban Other Principal 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionSeptember 2023
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating76.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length80 ft (24.4 m)
Longest span25 ft (7.6 m)
Deck width95 ft (29 m)
Roadway width81 ft (24.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,036 (2017)
Projected traffic31,244 by 2041
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Arrow HWY over San Dimas Wash built?

It was built in 1959, making it 66 years old in 2025.

What condition is Arrow HWY 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 September 2023.

How much traffic does Arrow HWY over San Dimas Wash carry?

About 26,036 vehicles per day (2017 count), of which roughly 4% are trucks.

How long is Arrow HWY over San Dimas Wash?

The structure is 80 ft (24.4 m) long with a longest span of 25 ft (7.6 m) and a deck 95 ft wide.

Who owns Arrow HWY over San Dimas Wash?

It is owned by the City or Municipal Highway Agency.