US Bridges

Alton Avenue over Santa Ana Delhi Channel

Fair

Orange County, California · 100 E/O Flower ST · Structure no. 55C0364

Built
1970
55 years old
Condition
Fair
inspected February 2025
Type
Culvert
Concrete
Length
36 ft
3 main spans
Daily traffic
5,000
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Alton Avenue over Santa Ana Delhi Channel is a concrete culvert carrying Alton Avenue over Santa Ana Delhi Channel in Orange County, California. It was built in 1970, so it is 55 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 5,000 vehicles a day, roughly 2% of them trucks, projected to reach 10,940 by 2047. The structure is 36 ft (11 m) long and 61 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesAlton Avenue
CrossesSanta Ana Delhi Channel
Location100 E/O Flower ST
RouteCity Street 0
CountyOrange County
StateCalifornia
Coordinates33.70538, -117.8767
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2025
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length36 ft (11 m)
Longest span11 ft (3.4 m)
Deck width61 ft (18.5 m)
Roadway width44 ft (13.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2021)
Projected traffic10,940 by 2047
Trucks2%
Lanes on structure3
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 Alton Avenue over Santa Ana Delhi Channel built?

It was built in 1970, making it 55 years old in 2025.

What condition is Alton Avenue over Santa Ana Delhi 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 February 2025.

How much traffic does Alton Avenue over Santa Ana Delhi Channel carry?

About 5,000 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Alton Avenue over Santa Ana Delhi Channel?

The structure is 36 ft (11 m) long with a longest span of 11 ft (3.4 m) and a deck 61 ft wide.

Who owns Alton Avenue over Santa Ana Delhi Channel?

It is owned by the City or Municipal Highway Agency.