US Bridges

Lycoming ST over Diamond Bar Crk

Good

Los Angeles County, California · 200FT E/O Brea Cyn RD · Structure no. 53C0937

Built
1987
38 years old
Condition
Good
inspected September 2021
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
10,666
2012 count
Owner
City
City or Municipal Highway Agency

About this bridge

Lycoming ST over Diamond Bar Crk is a concrete culvert carrying Lycoming ST over Diamond Bar Crk in Los Angeles County, California. It was built in 1987, so it is 38 years old, younger 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 10,666 vehicles a day, roughly 2% of them trucks, projected to reach 12,265 by 2041. The structure is 24 ft (7.3 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLycoming ST
CrossesDiamond Bar Crk
Location200FT E/O Brea Cyn RD
RouteCity Street 0
CountyLos Angeles County
StateCalifornia
Coordinates34.00283, -117.84571
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span18 ft (5.5 m)
Deck width53 ft (16.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,666 (2012)
Projected traffic12,265 by 2041
Trucks2%
Lanes on structure2
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 Lycoming ST over Diamond Bar Crk built?

It was built in 1987, making it 38 years old in 2025.

What condition is Lycoming ST over Diamond Bar 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 September 2021.

How much traffic does Lycoming ST over Diamond Bar Crk carry?

About 10,666 vehicles per day (2012 count), of which roughly 2% are trucks.

How long is Lycoming ST over Diamond Bar Crk?

The structure is 24 ft (7.3 m) long with a longest span of 18 ft (5.5 m) and a deck 53 ft wide.

Who owns Lycoming ST over Diamond Bar Crk?

It is owned by the City or Municipal Highway Agency.