US Bridges

Crowther Avenue over Carbon Canyon Channel

Fair

Orange County, California · 0.2 Mi. W/O Orangethorpe · Structure no. 55C0587

Built
1990
35 years old
Condition
Fair
inspected September 2023
Type
Slab
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
3,300
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Crowther Avenue over Carbon Canyon Channel is a prestressed concrete slab carrying Crowther Avenue over Carbon Canyon Channel in Orange County, California. It was built in 1990, so it is 35 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 3,300 vehicles a day, roughly 4% of them trucks, projected to reach 7,202 by 2043. The structure is 44 ft (13.4 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesCrowther Avenue
CrossesCarbon Canyon Channel
Location0.2 Mi. W/O Orangethorpe
RouteCity Street 0
CountyOrange County
StateCalifornia
Coordinates33.86794, -117.85376
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length44 ft (13.4 m)
Longest span43 ft (13.1 m)
Deck width63 ft (19.2 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,300 (2019)
Projected traffic7,202 by 2043
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 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Crowther Avenue over Carbon Canyon Channel built?

It was built in 1990, making it 35 years old in 2025.

What condition is Crowther Avenue over Carbon Canyon Channel 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 Crowther Avenue over Carbon Canyon Channel carry?

About 3,300 vehicles per day (2019 count), of which roughly 4% are trucks.

How long is Crowther Avenue over Carbon Canyon Channel?

The structure is 44 ft (13.4 m) long with a longest span of 43 ft (13.1 m) and a deck 63 ft wide.

Who owns Crowther Avenue over Carbon Canyon Channel?

It is owned by the City or Municipal Highway Agency.