I-15 (SR-15) NBL
I-15 (SR-15) NBL in 500 W. .Intchg. Bountiful, Davis County, Utah received a condition grade of C (48/100). Built in 1960, the bridge carries 133K vehicles daily on I-15 (SR-15) NBL over Ramp I-15sb To US-89sb.
I-15 (SR-15) NBL carries a C on the BridgeSafety Condition Score with 48/100. Component ratings sit in the middle of the FHWA NBI distribution; rehabilitation programming is likely on the owning agency’s medium-term horizon.
The bridge was built in 1960 and is now 66 years old, at or past the typical 50-year design life for bridges of its vintage. Maintenance and inspection cycles are correspondingly more involved than for newer structures. I-15 (SR-15) NBL carries an average daily traffic count of 132,631 vehicles, with 4 lane(s) crossing Ramp I-15sb To US-89sb. 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 66-year-old bridge located 500 W. .Intchg. Bountiful in Davis County, Utah. The bridge carries I-15 (SR-15) NBL over Ramp I-15sb To US-89sb with 4 traffic lanes, handling approximately 133K vehicles per day. Built in 1960 and reconstructed in 2000, the structure spans 70.7 meters.
The bridge received a Condition Grade of C (48/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (fair), superstructure 5/9 (fair), and substructure 5/9 (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 48/100 (Grade C). Its deck is rated 5/9, superstructure 5/9, and substructure 5/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-15 (SR-15) NBL was built in 1960 and reconstructed in 2000, making it 66 years old. The average bridge age in the United States is 48 years.
I-15 (SR-15) NBL carries approximately 133K vehicles per day (average daily traffic). The bridge has 4 traffic lanes. It is 70.7 meters long and located on I-15 (SR-15) NBL in 500 W. .Intchg. Bountiful, Davis 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 500 W. .Intchg. Bountiful in Davis County, Utah. The bridge carries I-15 (SR-15) NBL over Ramp I-15sb To US-89sb. Its coordinates are 40.900133, -111.892475. It is maintained by State Highway Agency.
I-15 (SR-15) NBL carries I-15 (SR-15) NBL over Ramp I-15sb To US-89sb. The bridge is 70.7 meters long and was built in 1960, with reconstruction in 2000.
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.