GA 325 first appeared on the state highway system by 1961. In all, it appears that a previously unpaved loop road around Lake Nottely was joined with another road joining U.S. 76 to form the route. The part of that loop road that is not today part of GA 325 is county-maintained Pat Colwell Road. In all, this loop road was originally built in 1942 by TVA west of Lake Nottely as a replacement for previously existing roads that were submerged by the reservoir. When completed, the road was designated with the rather significant title of "County Road 1".

After the route was commissioned, from 1961-1988, the highway remained pretty static other than shoulder widening, but major changes began to take place that led to an unusual turn of events. The first of these events was the raising of Nottely Dam, which required a long-term closure of the highway. The completed project included a new spillway and new roadway atop the dam, replacing an older spillway bridge that was completed in 1942 along with the roadway itself. This resulted in a lengthy detour along a formerly unpaved county road that remained as such throughout a period during 1988 and into 1989. The second major event involved the relocation of part of the highway to accomodate the intersection with the new U.S. 76, which now is better known as GA 515.

In all, the work on the second project also featured a relocation of the roadway away from a dangerous curve and bridge. The problem with the second project was that when the road that traversed it was completed, GA 325 would become a county road. When this new four-lane opened in late 1988, the entire length of the highway was turned over to Union County and shortly after named Nottely Dam Road.

Normally, when a route is turned to the county the state absolutely refuses to take it back over no matter how long it has been decommissioned or how plausable the cause. In this case, however, a group of local business owners along the route marched down to then Governor Joe Frank Harris's office and demanded that the road be restored to state control, citing a loss in business due to the turnback of the rural highway. The governor granted the wishes of the consituents and GDOT was ordered to take back the entire route north of the new highway. This was done on April 13, 1989.

The map on the left shows GA 325 and U.S. 76 on its old alignment in 1987. The 1988 map shows GA 325 decommissioned even before it actually was decommissioned. Also note part of Old U.S. 76 is shown. GA 325 was later restored in early 1989 north of the new four-lane shown on the second map.

Despite the restoration of the route, the highway was not restored in its entirety because its former terminus to the south at U.S. 76 had also become a county road the year before. As a result, the new GA 325 was actually 1.5 miles shorter than the former route with the rest remaining a county road. Since 1989, the route has seen no further changes.