US Bridges

National Ave over Interstate 5

Fair

San Diego County, California · 11-SD-005-R13.48-SD · Structure no. 57 0442

Built
1963
62 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
450 ft
5 main spans
Daily traffic
13,600
2020 count
Owner
State
State Highway Agency

About this bridge

National Ave over Interstate 5 is a concrete continuous box beam or girders - multiple carrying National Ave over Interstate 5 in San Diego County, California. It was built in 1963, so it is 62 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 13,600 vehicles a day, roughly 1% of them trucks, projected to reach 20,608 by 2040. The structure is 450 ft (137.2 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNational Ave
CrossesInterstate 5
Location11-SD-005-R13.48-SD
RouteCity Street 0S221
CountySan Diego County
StateCalifornia
Coordinates32.69583, -117.13586
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.1 US tons
Inventory rating44 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length450 ft (137.2 m)
Longest span132 ft (40.2 m)
Deck width74 ft (22.6 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,600 (2020)
Projected traffic20,608 by 2040
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 National Ave over Interstate 5 built?

It was built in 1963, making it 62 years old in 2025.

What condition is National Ave over Interstate 5 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 May 2023.

How much traffic does National Ave over Interstate 5 carry?

About 13,600 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is National Ave over Interstate 5?

The structure is 450 ft (137.2 m) long with a longest span of 132 ft (40.2 m) and a deck 74 ft wide.

Who owns National Ave over Interstate 5?

It is owned by the State Highway Agency.