US Bridges

Interstate 15 SB over Mission Avenue

Fair

San Diego County, California · 11-SD-015-R31.32-ESD · Structure no. 57 0813L

Built
1977
48 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
195 ft
3 main spans
Daily traffic
97,000
2018 count
Owner
State
State Highway Agency

About this bridge

Interstate 15 SB over Mission Avenue is a concrete continuous box beam or girders - multiple carrying Interstate 15 SB over Mission Avenue 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 97,000 vehicles a day, roughly 7% of them trucks, projected to reach 176,012 by 2046. The structure is 195 ft (59.4 m) long and 70 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterstate 15 SB
CrossesMission Avenue
Location11-SD-015-R31.32-ESD
RouteInterstate 15
CountySan Diego County
StateCalifornia
Coordinates33.12428, -117.104
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.9 US tons
Inventory rating55.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length195 ft (59.4 m)
Longest span90 ft (27.4 m)
Deck width70 ft (21.2 m)
Roadway width66 ft (20.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97,000 (2018)
Projected traffic176,012 by 2046
Trucks7%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 Interstate 15 SB over Mission Avenue built?

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

What condition is Interstate 15 SB over Mission Avenue 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 Interstate 15 SB over Mission Avenue carry?

About 97,000 vehicles per day (2018 count), of which roughly 7% are trucks.

How long is Interstate 15 SB over Mission Avenue?

The structure is 195 ft (59.4 m) long with a longest span of 90 ft (27.4 m) and a deck 70 ft wide.

Who owns Interstate 15 SB over Mission Avenue?

It is owned by the State Highway Agency.