I-15 (SR-15) NBL
I-15 (SR-15) NBL in Hafb Intch (650 North), Davis County, Utah received a condition grade of C (58/100). Built in 1966, the bridge carries 144K vehicles daily on I-15 (SR-15) NBL over SR-103 W. Gate Hill Afb.
I-15 (SR-15) NBL carries a C on the BridgeSafety Condition Score with 58/100. 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 1966 and is now 60 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 143,969 vehicles, with 3 lane(s) crossing SR-103 W. Gate Hill Afb. 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 60-year-old bridge located Hafb Intch (650 North) in Davis County, Utah. The bridge carries I-15 (SR-15) NBL over SR-103 W. Gate Hill Afb with 3 traffic lanes, handling approximately 144K vehicles per day. Built in 1966, the structure spans 52.9 meters.
The bridge received a Condition Grade of C (58/100) based on Federal Highway Administration inspection data. Its deck is rated 5/9 (fair), superstructure 6/9 (fair), 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 58/100 (Grade C). Its deck is rated 5/9, superstructure 6/9, and substructure 6/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-15 (SR-15) NBL was built in 1966, making it 60 years old. The average bridge age in the United States is 48 years.
I-15 (SR-15) NBL carries approximately 144K vehicles per day (average daily traffic). The bridge has 3 traffic lanes. It is 52.9 meters long and located on I-15 (SR-15) NBL in Hafb Intch (650 North), 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 Hafb Intch (650 North) in Davis County, Utah. The bridge carries I-15 (SR-15) NBL over SR-103 W. Gate Hill Afb. Its coordinates are 41.123611, -112.023333. It is maintained by State Highway Agency.
I-15 (SR-15) NBL carries I-15 (SR-15) NBL over SR-103 W. Gate Hill Afb. The bridge is 52.9 meters long and was built in 1966.
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.