US Bridges

Carlsbad Blvd N/B over Drainage Ditch

Fair

San Diego County, California · 0.1MI N/O Avenida Encinas · Structure no. 57C0212

Built
1952
73 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
83 ft
3 main spans
Daily traffic
8,146
2016 count
Owner
City
City or Municipal Highway Agency

About this bridge

Carlsbad Blvd N/B over Drainage Ditch is a concrete continuous slab carrying Carlsbad Blvd N/B over Drainage Ditch in San Diego County, California. It was built in 1952, so it is 73 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 8,146 vehicles a day, roughly 1% of them trucks, projected to reach 15,875 by 2040. The structure is 83 ft (25.3 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesCarlsbad Blvd N/B
CrossesDrainage Ditch
Location0.1MI N/O Avenida Encinas
RouteCity Street 0
Coordinates33.09348, -117.31441
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length83 ft (25.3 m)
Longest span32 ft (9.8 m)
Deck width43 ft (13.1 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,146 (2016)
Projected traffic15,875 by 2040
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesOther
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 Carlsbad Blvd N/B over Drainage Ditch built?

It was built in 1952, making it 73 years old in 2025.

What condition is Carlsbad Blvd N/B over Drainage Ditch 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 August 2023.

How much traffic does Carlsbad Blvd N/B over Drainage Ditch carry?

About 8,146 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is Carlsbad Blvd N/B over Drainage Ditch?

The structure is 83 ft (25.3 m) long with a longest span of 32 ft (9.8 m) and a deck 43 ft wide.

Who owns Carlsbad Blvd N/B over Drainage Ditch?

It is owned by the City or Municipal Highway Agency.