The initial proposal for Interstate 485 was an alignment east from the Downtown Connector (I-75/85) to the Perimeter Highway (I-285) at the Stone Mountain Freeway. The corridor was numbered Georgia State Route 410, one of the SR 400 series applied to every Interstate highway assigned within the Peach State. Stone Mountain Freeway (U.S. 78) branches east from U.S. 29 (Lawrenceville Highway) to Interstate 285 and Rockbridge Road near Stone Mountain Park. The portion west to Downtown was never constructed.
The proposed route of Georgia State Route 410 in 1967 ran east from I-75/85 past Inman Park and Druid Hills in Atlanta and northward around Decatur.
With the Stone Mountain Freeway canceled west of Lawrenceville Highway, I-485 was reconsidered as a connector between I-75/85 at Downtown Atlanta and the proposed SR 400 freeway extending north from Interstate 675 in DeKalb County. SR 400 south to I-285 was eventually dropped along with the western SR 410 corridor for I-485.
The American Association of State Highway and Transportation Officials (AASHTO) approved the northeasterly loop of Interstate 485 between the Downtown Connector and I-85 near Lenox Road on June 30, 1970. Following community opposition to the freeway, the route was subsequently eliminated by AASHTO on June 17, 1975. The Georgia Department of Transportation (GDOT) request to the Federal Highway Administration (FHWA) to withdraw I-485 from the Interstate System coincided with a request for the substitution of alternate Interstate Routes in the state in accordance with the provisions of 23 U.S.C. 103(e)(2):
- I-175 – 37.8 miles from the proposed Albany Bypass (SR 333) northeast to I-75 south of Cordele
- I-420 – 6.0 miles from I-75/85 in Atlanta to I-20
- I-675 – 9.5 miles from I-75 near Stockbridge to I-285 southeast of Atlanta
The short freeway spur east from the high speed interchange with I-75/85 to Howell Street was the only section of I-485 ever constructed. It was later renumbered as SR 410, and then ultimately as part of SR 10.
Construction of John Lewis Freedom Parkway (SR 10 / SR 42 Spur) in the early to mid 1990s utilized a portion of the former I-485 right of away. The ramps from Boulevard west to I-485 and from I-485 east to Howell Street were removed. The overpass at Boulevard was replaced with a signalized intersection as well. The at-grade, controlled access parkway links with the Jimmy Carter Presidential Library and Museum, U.S. 23 (Moreland Avenue) and U.S. 278 (Ponce De Leon Avenue).