I-75
I-75 in In Detroit Over N-W Rampt, Wayne County, Michigan received a condition grade of B (74/100). Built in 1969, the bridge carries 152K vehicles daily on I-75 over Ramp D To Davison(M-8).
I-75 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 1969 and is now 57 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-75 carries an average daily traffic count of 152,325 vehicles, with 7 lane(s) crossing Ramp D To Davison(M-8). 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 57-year-old bridge located In Detroit Over N-W Rampt in Wayne County, Michigan. The bridge carries I-75 over Ramp D To Davison(M-8) with 7 traffic lanes, handling approximately 152K vehicles per day. Built in 1969 and reconstructed in 2003, the structure spans 15.2 meters.
The bridge received a Condition Grade of B (74/100) based on Federal Highway Administration inspection data. Its deck is rated 7/9 (good), 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-75 has a Condition Score of 74/100 (Grade B). Its deck is rated 7/9, superstructure 7/9, and substructure 7/9 on the NBI scale. The bridge is not classified as structurally deficient.
I-75 was built in 1969 and reconstructed in 2003, making it 57 years old. The average bridge age in the United States is 48 years.
I-75 carries approximately 152K vehicles per day (average daily traffic). The bridge has 7 traffic lanes. It is 15.2 meters long and located on I-75 in In Detroit Over N-W Rampt, Wayne County, Michigan.
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 In Detroit Over N-W Rampt in Wayne County, Michigan. The bridge carries I-75 over Ramp D To Davison(M-8). Its coordinates are 42.410083, -83.080419. It is maintained by State Highway Agency.
I-75 carries I-75 over Ramp D To Davison(M-8). The bridge is 15.2 meters long and was built in 1969, with reconstruction in 2003.
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.