US Bridges

I-15 (SR-15) Nbl over 300 North Street

Fair

Salt Lake County, Utah · 600 West 300 North ST Slc · Structure no. 1F 662N

Built
1999
26 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
129 ft
3 main spans
Daily traffic
136,020
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over 300 North Street is a prestressed concrete continuous stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over 300 North 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 136,020 vehicles a day, roughly 9% of them trucks, projected to reach 170,025 by 2034. The structure is 129 ft (39.3 m) long and 85 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Nbl
Crosses300 North Street
Location600 West 300 North ST Slc
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.77554, -111.91037
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length129 ft (39.3 m)
Longest span79 ft (24 m)
Deck width85 ft (26 m)
Roadway width83 ft (25.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic136,020 (2014)
Projected traffic170,025 by 2034
Trucks9%
Lanes on structure5
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 I-15 (SR-15) Nbl over 300 North Street built?

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

What condition is I-15 (SR-15) Nbl over 300 North 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 July 2024.

How much traffic does I-15 (SR-15) Nbl over 300 North Street carry?

About 136,020 vehicles per day (2014 count), of which roughly 9% are trucks.

How long is I-15 (SR-15) Nbl over 300 North Street?

The structure is 129 ft (39.3 m) long with a longest span of 79 ft (24 m) and a deck 85 ft wide.

Who owns I-15 (SR-15) Nbl over 300 North Street?

It is owned by the State Highway Agency.