US Bridges

Carlsbad Blvd NB over San Marcos Creek

Fair

San Diego County, California · 0.4 Mile N/O LA Costa Ave · Structure no. 57C0667R

Built
1996
29 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
208 ft
6 main spans
Daily traffic
8,603
2017 count
Owner
City
City or Municipal Highway Agency

About this bridge

Carlsbad Blvd NB over San Marcos Creek is a concrete continuous slab carrying Carlsbad Blvd NB over San Marcos Creek in San Diego County, California. It was built in 1996, so it is 29 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 8,603 vehicles a day, roughly 1% of them trucks, projected to reach 10,409 by 2045. The structure is 208 ft (63.4 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCarlsbad Blvd NB
CrossesSan Marcos Creek
Location0.4 Mile N/O LA Costa Ave
RouteCity Street 0
CountySan Diego County
StateCalifornia
Coordinates33.08719, -117.31204
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
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 geometry7: Better than present minimum 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 typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length208 ft (63.4 m)
Longest span37 ft (11.4 m)
Deck width52 ft (15.7 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,603 (2017)
Projected traffic10,409 by 2045
Trucks1%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Carlsbad Blvd NB over San Marcos Creek built?

It was built in 1996, making it 29 years old in 2025.

What condition is Carlsbad Blvd NB over San Marcos Creek 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 NB over San Marcos Creek carry?

About 8,603 vehicles per day (2017 count), of which roughly 1% are trucks.

How long is Carlsbad Blvd NB over San Marcos Creek?

The structure is 208 ft (63.4 m) long with a longest span of 37 ft (11.4 m) and a deck 52 ft wide.

Who owns Carlsbad Blvd NB over San Marcos Creek?

It is owned by the City or Municipal Highway Agency.