Coweta County SR 70 begins at an
intersection with
US 29/
SR 14 in the northwestern part of
Newnan in the central part of
Coweta County. At this intersection, the roadway continues as Sprayberry Road. SR 70 travels to the west and immediately curves to the northwest. It leaves Newnan and intersects
SR 34 Byp. (Millard Farmer Industrial Boulevard). It curves to the north-northwest and then to a due-north direction. The highway crosses over Wahoo Creek and curves back to the north-northwest. It crosses over Little Wahoo Creek and then curves to the north-northeast. It curves back to the north-northwest and crosses over Cedar Creek. The highway then curves back to the north-northeast before entering the
unincorporated community of
Roscoe. There, it curves to the east-southeast and then back to the north-northeast. Then, it enters the southwestern part of
Fulton County.
Southwestern Fulton County SR 70 crosses over White Oak Creek before intersecting
South Fulton Parkway. Here, SR 70 turns right and travels to the southeast. It crosses over White Oak Creek again before it makes a gradual curve to the east-northeast. Then, it crosses over Moss Creek. After curving to the east-southeast, it crosses over Cedar Branch. Then, it begins a gradual curve back to the east-northeast. It intersects Cochran Mill Road, which leads to Cochran Mill Nature Center and Cochran Mill Park. The highway crosses over Little Bear Creek and Bear Creek before curving to the northeast. Just after curving back to the east-northeast, it intersects
US 29 Alt./
SR 14 Alt./
SR 154 (Cascade-Palmetto Highway). Here, US 29 Alt./SR 14 Alt. take the route of South Fulton Parkway, and SR 70 turns left onto SR 154. The two highways travel to the north-northeast. They curve to the north-northwest and begin paralleling Pea Creek. After crossing over that creek, they travel just to the west of Horsehead Lake. They then have a
roundabout with the eastern terminus of the western segment of Cedar Grove Road and the western terminus of Ridge Road. SR 70 and SR 154 curve back to the north-northeast and begin paralleling Tuggle Creek. After crossing over Town Creek, they curve to the northeast and enter
Campbellton. There, they intersect
SR 92 (Campbellton-Fairburn Road). SR 70 and SR 154 turn left and follow SR 92 to the northwest. An intersection with Church Street leads to Campbellton Park. They curve to the north-northwest and leave Campbellton before crossing over the
Chattahoochee River on the Robert and Ardena Beasley Memorial Bridge. This crossing marks the
Douglas County line.
Douglas County Almost immediately,
SR 166 joins the concurrency. The four highways curve to the northeast. They pass Boundary Waters Park. They curve to the north-northwest and pass
New Manchester High School. They curve back to the north-northeast and cross over Gilberts Branch. At an intersection with Fairburn Road and the southern terminus of Old Lower River Road, SR 92 turns left onto Fairburn Road west, and SR 70, SR 92, and SR 154 turns right onto Fairburn Road east. The three highways travel to the southeast. They curve to the east-southeast and then cross over the Chattahoochee River again, this time on the Dick Lane Bridge, and re-enter Fulton County, this time in the west-central part of it.
West-central Fulton County At an intersection with Fulton Industrial Boulevard, SR 70 turns left and travels to the northeast, while SR 154 and SR 166 continue to the east-southeast on Campbellton Road. The highway then curves to the north-northeast. It curves back to the northeast and intersects
SR 6. It crosses over
Utoy Creek before an
interchange with
Interstate 20 (I-20; Tom Murphy Freeway). Then, it has an intersection with
SR 139. The highway crosses over Sandy Creek and curves to the east-northeast. It then enters
Atlanta before meeting its northern terminus, an intersection with
US 78/
US 278/
SR 8 (Donald Lee Hollowell Parkway NW). Here, the roadway continues as Fulton Industrial Boulevard NW. ==History==