US Bridges

EB 91 Off Ramp over Carbon Cyn Diversion Cha

Good

Orange County, California · 12-ORA-091-7.27-ANA · Structure no. 55 0396S

Built
1964
61 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
47 ft
3 main spans
Daily traffic
31,460
2016 count
Owner
State
State Highway Agency

About this bridge

EB 91 Off Ramp over Carbon Cyn Diversion Cha is a concrete culvert carrying EB 91 Off Ramp over Carbon Cyn Diversion Cha in Orange County, California. It was built in 1964, so it is 61 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 31,460 vehicles a day, roughly 9% of them trucks, projected to reach 36,218 by 2042. The structure is 47 ft (14.3 m) long and 164 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesEB 91 Off Ramp
CrossesCarbon Cyn Diversion Cha
Location12-ORA-091-7.27-ANA
RouteState Highway 91
Coordinates33.84678, -117.85695
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Culvert8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
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
DeckNot applicable
Main spans3
Design loadUnknown
Structure length47 ft (14.3 m)
Longest span15 ft (4.6 m)
Deck width164 ft (50 m)
Roadway width135 ft (41 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,460 (2016)
Projected traffic36,218 by 2042
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 EB 91 Off Ramp over Carbon Cyn Diversion Cha built?

It was built in 1964, making it 61 years old in 2025.

What condition is EB 91 Off Ramp over Carbon Cyn Diversion Cha 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 2024.

How much traffic does EB 91 Off Ramp over Carbon Cyn Diversion Cha carry?

About 31,460 vehicles per day (2016 count), of which roughly 9% are trucks.

How long is EB 91 Off Ramp over Carbon Cyn Diversion Cha?

The structure is 47 ft (14.3 m) long with a longest span of 15 ft (4.6 m) and a deck 164 ft wide.

Who owns EB 91 Off Ramp over Carbon Cyn Diversion Cha?

It is owned by the State Highway Agency.