US Bridges

Merced Ave over Walnut Crk

Good

Los Angeles County, California · 60FT W/O Orange Ave · Structure no. 53C0731

Built
1961
64 years old
Condition
Good
inspected November 2021
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
64 ft
1 main span
Daily traffic
11,726
2014 count
Owner
City
City or Municipal Highway Agency

About this bridge

Merced Ave over Walnut Crk is a prestressed concrete box beam or girders - multiple carrying Merced Ave over Walnut Crk in Los Angeles County, California. It was built in 1961, so it is 64 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 11,726 vehicles a day, roughly 1% of them trucks, projected to reach 13,485 by 2042. The structure is 64 ft (19.5 m) long and 72 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesMerced Ave
CrossesWalnut Crk
Location60FT W/O Orange Ave
RouteCity Street 0L686
Coordinates34.06502, -117.95097
Functional classUrban Minor 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.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionNovember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating80.4 US tons
Inventory rating48.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span58 ft (17.7 m)
Deck width72 ft (21.9 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,726 (2014)
Projected traffic13,485 by 2042
Trucks1%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 Merced Ave over Walnut Crk built?

It was built in 1961, making it 64 years old in 2025.

What condition is Merced Ave over Walnut Crk 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 November 2021.

How much traffic does Merced Ave over Walnut Crk carry?

About 11,726 vehicles per day (2014 count), of which roughly 1% are trucks.

How long is Merced Ave over Walnut Crk?

The structure is 64 ft (19.5 m) long with a longest span of 58 ft (17.7 m) and a deck 72 ft wide.

Who owns Merced Ave over Walnut Crk?

It is owned by the City or Municipal Highway Agency.