US Bridges

Interstate 15 SB over Mesa Rock RD

Fair

San Diego County, California · 11-SD-015-R34.89 · Structure no. 57 0893L

Built
1978
47 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
133 ft
1 main span
Daily traffic
70,000
2020 count
Owner
State
State Highway Agency

About this bridge

Interstate 15 SB over Mesa Rock RD is a prestressed concrete box beam or girders - multiple carrying Interstate 15 SB over Mesa Rock RD in San Diego County, California. It was built in 1978, so it is 47 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 70,000 vehicles a day, roughly 10% of them trucks, projected to reach 99,500 by 2045. The structure is 133 ft (40.5 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesInterstate 15 SB
CrossesMesa Rock RD
Location11-SD-015-R34.89
RouteInterstate 15
CountySan Diego County
StateCalifornia
Coordinates33.17448, -117.11272
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
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 rating77.2 US tons
Inventory rating55.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length133 ft (40.5 m)
Longest span132 ft (40.2 m)
Deck width69 ft (21 m)
Roadway width65 ft (19.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70,000 (2020)
Projected traffic99,500 by 2045
Trucks10%
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 Mesa Rock RD built?

It was built in 1978, making it 47 years old in 2025.

What condition is Interstate 15 SB over Mesa Rock RD 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 June 2024.

How much traffic does Interstate 15 SB over Mesa Rock RD carry?

About 70,000 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Interstate 15 SB over Mesa Rock RD?

The structure is 133 ft (40.5 m) long with a longest span of 132 ft (40.2 m) and a deck 69 ft wide.

Who owns Interstate 15 SB over Mesa Rock RD?

It is owned by the State Highway Agency.