I-15 (SR-15) NBL
I-15 (SR-15) NBL in Lehi Main ST.Interchange, Utah County, Utah received a condition grade of B (74/100). Built in 1993, the bridge carries 179K vehicles daily on I-15 (SR-15) NBL over Lehi Main ST SR-73.
I-15 (SR-15) NBL carries a B on the BridgeSafety Condition Score with 74/100. Most component ratings are solid; one or two may show wear consistent with the structure’s age, but the bridge is not flagged as structurally deficient.
The bridge was built in 1993, making it 33 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. I-15 (SR-15) NBL carries an average daily traffic count of 179,486 vehicles, with 6 lane(s) crossing Lehi Main ST SR-73. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
Component Ratings
The riding surface, evaluated for cracking, spalling, and wear
Beams, girders, and trusses that support the deck
Piers, abutments, and foundations below the deck
Bridge Details
About This Bridge
I-15 (SR-15) NBL is a 33-year-old bridge located Lehi Main ST.Interchange in Utah County, Utah. The bridge carries I-15 (SR-15) NBL over Lehi Main ST SR-73 with 6 traffic lanes, handling approximately 179K vehicles per day. Built in 1993 and reconstructed in 2019, the structure spans 62.4 meters.
The bridge received a Condition Grade of B (74/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), superstructure 7/9 (good), and substructure 6/9 (fair).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-15 (SR-15) NBL has a Condition Score of 74/100 (Grade B). Its deck is rated 7/9, superstructure 7/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-15 (SR-15) NBL was built in 1993 and reconstructed in 2019, making it 33 years old. The average bridge age in the United States is 48 years.
I-15 (SR-15) NBL carries approximately 179K vehicles per day (average daily traffic). The bridge has 6 traffic lanes. It is 62.4 meters long and located on I-15 (SR-15) NBL in Lehi Main ST.Interchange, Utah County, Utah.
No, I-15 (SR-15) NBL is not classified as structurally deficient. All three primary components (deck, superstructure, and substructure) are rated above 4 on the 0-9 NBI scale.
I-15 (SR-15) NBL is located Lehi Main ST.Interchange in Utah County, Utah. The bridge carries I-15 (SR-15) NBL over Lehi Main ST SR-73. Its coordinates are 40.387958, -111.833331. It is maintained by State Highway Agency.
I-15 (SR-15) NBL carries I-15 (SR-15) NBL over Lehi Main ST SR-73. The bridge is 62.4 meters long and was built in 1993, with reconstruction in 2019.
Condition Score is calculated from deck (33%), superstructure (33%), and substructure (34%) NBI ratings with an age penalty for bridges over 50 years.
Source: FHWA National Bridge Inventory, 2026.