US Bridges

Weir Canyon Road over Old Canal Road

Fair

Orange County, California · 0.2 MI N/O Fwy 91 · Structure no. 55C0522

Built
1984
41 years old
Condition
Fair
inspected April 2023
Type
Arch - Deck
Steel
Length
79 ft
2 main spans
Daily traffic
34,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Weir Canyon Road over Old Canal Road is a steel arch - deck carrying Weir Canyon Road over Old Canal Road in Orange County, California. It was built in 1984, so it is 41 years old, younger 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 34,000 vehicles a day, roughly 1% of them trucks, projected to reach 71,480 by 2040. The structure is 79 ft (24.1 m) long and 125 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesWeir Canyon Road
CrossesOld Canal Road
Location0.2 MI N/O Fwy 91
RouteCity Street 0
CountyOrange County
StateCalifornia
Coordinates33.8729, -117.74603
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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Deck
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length79 ft (24.1 m)
Longest span38 ft (11.6 m)
Deck width125 ft (38 m)
Roadway width101 ft (30.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,000 (2020)
Projected traffic71,480 by 2040
Trucks1%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Weir Canyon Road over Old Canal Road built?

It was built in 1984, making it 41 years old in 2025.

What condition is Weir Canyon Road over Old Canal Road 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 Weir Canyon Road over Old Canal Road carry?

About 34,000 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Weir Canyon Road over Old Canal Road?

The structure is 79 ft (24.1 m) long with a longest span of 38 ft (11.6 m) and a deck 125 ft wide.

Who owns Weir Canyon Road over Old Canal Road?

It is owned by the City or Municipal Highway Agency.