I-15 (SR-15) NBL
I-15 (SR-15) NBL in 700 West 400 South ST., Salt Lake County, Utah received a condition grade of B (74/100). Built in 1999, the bridge carries 173K vehicles daily on I-15 (SR-15) NBL over SR-267 400 So. ST..
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 1999, making it 27 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 172,645 vehicles, with 4 lane(s) crossing SR-267 400 So. ST.. 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 27-year-old bridge located 700 West 400 South ST. in Salt Lake County, Utah. The bridge carries I-15 (SR-15) NBL over SR-267 400 So. ST. with 4 traffic lanes, handling approximately 173K vehicles per day. Built in 1999, the structure spans 150.9 meters.
The bridge received a Condition Grade of B (74/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 7/9 (good), and substructure 7/9 (good).
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 6/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-15 (SR-15) NBL was built in 1999, making it 27 years old. The average bridge age in the United States is 48 years.
I-15 (SR-15) NBL carries approximately 173K vehicles per day (average daily traffic). The bridge has 4 traffic lanes. It is 150.9 meters long and located on I-15 (SR-15) NBL in 700 West 400 South ST., Salt Lake 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 700 West 400 South ST. in Salt Lake County, Utah. The bridge carries I-15 (SR-15) NBL over SR-267 400 So. ST.. Its coordinates are 40.759775, -111.913939. It is maintained by State Highway Agency.
I-15 (SR-15) NBL carries I-15 (SR-15) NBL over SR-267 400 So. ST.. The bridge is 150.9 meters long and was built in 1999.
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.