US Bridges

N15-W78 Connector over RTE 15 RTE 78 Conn

Fair

San Diego County, California · 11-SD-015-R31.47-ESD · Structure no. 57 0815G

Built
1977
48 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
1,061 ft
7 main spans
Daily traffic
41,000
2018 count
Owner
State
State Highway Agency

About this bridge

N15-W78 Connector over RTE 15 RTE 78 Conn is a prestressed concrete continuous box beam or girders - multiple carrying N15-W78 Connector over RTE 15 RTE 78 Conn in San Diego County, California. It was built in 1977, so it is 48 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 41,000 vehicles a day, roughly 2% of them trucks, projected to reach 53,798 by 2046. The structure is 1,061 ft (323.4 m) long and 44 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesN15-W78 Connector
CrossesRTE 15 RTE 78 Conn
Location11-SD-015-R31.47-ESD
RouteInterstate 15
CountySan Diego County
StateCalifornia
Coordinates33.12591, -117.10392
Functional classUrban Principal Arterial - Interstate

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating47.5 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length1,061 ft (323.4 m)
Longest span189 ft (57.6 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,000 (2018)
Projected traffic53,798 by 2046
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 N15-W78 Connector over RTE 15 RTE 78 Conn built?

It was built in 1977, making it 48 years old in 2025.

What condition is N15-W78 Connector over RTE 15 RTE 78 Conn 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 March 2024.

How much traffic does N15-W78 Connector over RTE 15 RTE 78 Conn carry?

About 41,000 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is N15-W78 Connector over RTE 15 RTE 78 Conn?

The structure is 1,061 ft (323.4 m) long with a longest span of 189 ft (57.6 m) and a deck 44 ft wide.

Who owns N15-W78 Connector over RTE 15 RTE 78 Conn?

It is owned by the State Highway Agency.