I-75
I-75 in 6.7 MI SE Of Marietta, Cobb County, Georgia received a condition grade of B (71/100). Built in 1963, the bridge carries 149K vehicles daily on I-75 over I-285 Ramp Cbl Cd.
I-75 carries a B on the BridgeSafety Condition Score with 71/100. 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 1963 and is now 63 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 149,000 vehicles, with 8 lane(s) crossing I-285 Ramp Cbl Cd. 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 63-year-old bridge located 6.7 MI SE Of Marietta in Cobb County, Georgia. The bridge carries I-75 over I-285 Ramp Cbl Cd with 8 traffic lanes, handling approximately 149K vehicles per day. Built in 1963 and reconstructed in 2018, the structure spans 51.8 meters.
The bridge received a Condition Grade of B (71/100) 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 71/100 (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 1963 and reconstructed in 2018, making it 63 years old. The average bridge age in the United States is 48 years.
I-75 carries approximately 149K vehicles per day (average daily traffic). The bridge has 8 traffic lanes. It is 51.8 meters long and located on I-75 in 6.7 MI SE Of Marietta, Cobb County, Georgia.
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 6.7 MI SE Of Marietta in Cobb County, Georgia. The bridge carries I-75 over I-285 Ramp Cbl Cd. Its coordinates are 33.889706, -84.460350. It is maintained by State Highway Agency.
I-75 carries I-75 over I-285 Ramp Cbl Cd. The bridge is 51.8 meters long and was built in 1963, with reconstruction in 2018.
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.