IR 75
IR 75 in .6 MI N Of SR 4, Hamilton County, Ohio received a condition grade of B (60/100). Built in 1947, the bridge carries 157K vehicles daily on IR 75 over Mill Creek.
IR 75 carries a B on the BridgeSafety Condition Score with 60/100. 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 1947 and is now 79 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. IR 75 carries an average daily traffic count of 156,804 vehicles, with 8 lane(s) crossing Mill Creek. 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
IR 75 is a 79-year-old bridge located .6 MI N Of SR 4 in Hamilton County, Ohio. The bridge carries IR 75 over Mill Creek with 8 traffic lanes, handling approximately 157K vehicles per day. Built in 1947 and reconstructed in 1989, the structure spans 60.4 meters.
The bridge received a Condition Grade of B (60/100) 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
IR 75 has a Condition Score of 60/100 (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.
IR 75 was built in 1947 and reconstructed in 1989, making it 79 years old. The average bridge age in the United States is 48 years.
IR 75 carries approximately 157K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 60.4 meters long and located on IR 75 in .6 MI N Of SR 4, Hamilton County, Ohio.
No, IR 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.
IR 75 is located .6 MI N Of SR 4 in Hamilton County, Ohio. The bridge carries IR 75 over Mill Creek. Its coordinates are 39.201500, -84.468239. It is maintained by State Highway Agency.
IR 75 carries IR 75 over Mill Creek. The bridge is 60.4 meters long and was built in 1947, with reconstruction in 1989.
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.