US Bridges

State Route 1 over Laguna Canyon Channel

Good

Orange County, California · 12-ORA-001-9.39-LGNB · Structure no. 55 1106

Built
1928
97 years old
Condition
Good
inspected June 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
36,000
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Laguna Canyon Channel is a concrete continuous culvert carrying State Route 1 over Laguna Canyon Channel in Orange County, California. It was built in 1928, so it is 97 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 36,000 vehicles a day, roughly 1% of them trucks, projected to reach 44,285 by 2040. The structure is 25 ft (7.5 m) long and 61 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesLaguna Canyon Channel
Location12-ORA-001-9.39-LGNB
RouteState Highway 1
CountyOrange County
StateCalifornia
Coordinates33.54266, -117.785
Functional classUrban Other Principal Arterial

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating15.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 10
Structure length25 ft (7.5 m)
Longest span12 ft (3.6 m)
Deck width61 ft (18.7 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,000 (2014)
Projected traffic44,285 by 2040
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 State Route 1 over Laguna Canyon Channel built?

It was built in 1928, making it 97 years old in 2025.

What condition is State Route 1 over Laguna Canyon Channel 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 June 2023.

How much traffic does State Route 1 over Laguna Canyon Channel carry?

About 36,000 vehicles per day (2014 count), of which roughly 1% are trucks.

How long is State Route 1 over Laguna Canyon Channel?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.6 m) and a deck 61 ft wide.

Who owns State Route 1 over Laguna Canyon Channel?

It is owned by the State Highway Agency.