I-75
I-75 in I75 Rmp To US 42, Boone County, Kentucky received a condition grade of B (78/100). Built in 1990, the bridge carries 140K vehicles daily on I-75 over Ky 18 Ramp.
I-75 carries a B on the BridgeSafety Condition Score with 78/100. 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 1990, making it 36 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-75 carries an average daily traffic count of 140,378 vehicles, with 2 lane(s) crossing Ky 18 Ramp. 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-75 is a 36-year-old bridge located I75 Rmp To US 42 in Boone County, Kentucky. The bridge carries I-75 over Ky 18 Ramp with 2 traffic lanes, handling approximately 140K vehicles per day. Built in 1990, the structure spans 36 meters.
The bridge received a Condition Grade of B (78/100) based on Federal Highway Administration inspection data. Its deck is rated 6/9 (fair), superstructure 8/9 (good), and substructure 7/9 (good).
This bridge is owned and maintained by State Highway Agency.
Location Map
Frequently Asked Questions
I-75 has a Condition Score of 78/100 (Grade B). Its deck is rated 6/9, superstructure 8/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-75 was built in 1990, making it 36 years old. The average bridge age in the United States is 48 years.
I-75 carries approximately 140K vehicles per day (average daily traffic). The bridge has 2 traffic lanes. It is 36 meters long and located on I-75 in I75 Rmp To US 42, Boone County, Kentucky.
No, I-75 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-75 is located I75 Rmp To US 42 in Boone County, Kentucky. The bridge carries I-75 over Ky 18 Ramp. Its coordinates are 38.986111, -84.642778. It is maintained by State Highway Agency.
I-75 carries I-75 over Ky 18 Ramp. The bridge is 36 meters long and was built in 1990.
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.