US Bridges

I-15 (SR-15) Nbl over SR-171 3300 South Street

Fair

Salt Lake County, Utah · 3300 South Interchange · Structure no. 1F 619N

Built
1999
26 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
237 ft
1 main span
Daily traffic
218,515
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over SR-171 3300 South Street is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over SR-171 3300 South Street in Salt Lake County, Utah. It was built in 1999, so it is 26 years old, younger than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 218,515 vehicles a day, roughly 24% of them trucks, projected to reach 273,144 by 2034. The structure is 237 ft (72.2 m) long and 85 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Nbl
CrossesSR-171 3300 South Street
Location3300 South Interchange
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.69943, -111.90172
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length237 ft (72.2 m)
Longest span226 ft (69 m)
Deck width85 ft (25.9 m)
Roadway width82 ft (25.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic218,515 (2014)
Projected traffic273,144 by 2034
Trucks24%
Lanes on structure5
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 I-15 (SR-15) Nbl over SR-171 3300 South Street built?

It was built in 1999, making it 26 years old in 2025.

What condition is I-15 (SR-15) Nbl over SR-171 3300 South Street 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 October 2024.

How much traffic does I-15 (SR-15) Nbl over SR-171 3300 South Street carry?

About 218,515 vehicles per day (2014 count), of which roughly 24% are trucks.

How long is I-15 (SR-15) Nbl over SR-171 3300 South Street?

The structure is 237 ft (72.2 m) long with a longest span of 226 ft (69 m) and a deck 85 ft wide.

Who owns I-15 (SR-15) Nbl over SR-171 3300 South Street?

It is owned by the State Highway Agency.