US Bridges

State Route 1 over N5-N1 Connector Ramp

Fair

Orange County, California · 12-ORA-001-R0.20-DAPT · Structure no. 55 0511

Built
1973
52 years old
Condition
Fair
inspected June 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
307 ft
1 main span
Daily traffic
37,000
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over N5-N1 Connector Ramp is a concrete box beam or girders - multiple carrying State Route 1 over N5-N1 Connector Ramp in Orange County, California. It was built in 1973, so it is 52 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 37,000 vehicles a day, roughly 6% of them trucks, projected to reach 47,900 by 2040. The structure is 307 ft (93.6 m) long and 98 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesN5-N1 Connector Ramp
Location12-ORA-001-R0.20-DAPT
RouteState Highway 1
CountyOrange County
StateCalifornia
Coordinates33.46604, -117.67066
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionJune 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 geometry9: 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 typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length307 ft (93.6 m)
Longest span307 ft (93.6 m)
Deck width98 ft (29.8 m)
Roadway width98 ft (29.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,000 (2014)
Projected traffic47,900 by 2040
Trucks6%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed2.5 mi (4 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 1 over N5-N1 Connector Ramp built?

It was built in 1973, making it 52 years old in 2025.

What condition is State Route 1 over N5-N1 Connector Ramp 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 June 2023.

How much traffic does State Route 1 over N5-N1 Connector Ramp carry?

About 37,000 vehicles per day (2014 count), of which roughly 6% are trucks.

How long is State Route 1 over N5-N1 Connector Ramp?

The structure is 307 ft (93.6 m) long with a longest span of 307 ft (93.6 m) and a deck 98 ft wide.

Who owns State Route 1 over N5-N1 Connector Ramp?

It is owned by the State Highway Agency.