US Bridges

I-15 (SR-15) Sbl over SR-73 Lehi Main St.

Fair

Utah County, Utah · Lehi Main St.Interchange · Structure no. 3C 783

Built
1993
32 years old, rebuilt 2011
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
205 ft
1 main span
Daily traffic
145,695
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over SR-73 Lehi Main St. is a steel stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over SR-73 Lehi Main St. in Utah County, Utah. It was built in 1993 and reconstructed in 2011, so it is 32 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 145,695 vehicles a day, roughly 25% of them trucks, projected to reach 182,119 by 2034. The structure is 205 ft (62.4 m) long and 101 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesSR-73 Lehi Main St.
LocationLehi Main St.Interchange
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates40.38861, -111.83417
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
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 rating50 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length205 ft (62.4 m)
Longest span202 ft (61.6 m)
Deck width101 ft (30.7 m)
Roadway width98 ft (29.8 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic145,695 (2014)
Projected traffic182,119 by 2034
Trucks25%
Lanes on structure6
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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) Sbl over SR-73 Lehi Main St. built?

It was built in 1993, making it 32 years old in 2025. It was reconstructed in 2011.

What condition is I-15 (SR-15) Sbl over SR-73 Lehi Main St. 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 February 2023.

How much traffic does I-15 (SR-15) Sbl over SR-73 Lehi Main St. carry?

About 145,695 vehicles per day (2014 count), of which roughly 25% are trucks.

How long is I-15 (SR-15) Sbl over SR-73 Lehi Main St.?

The structure is 205 ft (62.4 m) long with a longest span of 202 ft (61.6 m) and a deck 101 ft wide.

Who owns I-15 (SR-15) Sbl over SR-73 Lehi Main St.?

It is owned by the State Highway Agency.