City of Sandy Springs recently issued the following announcement.
Sweep the Hooch is an annual watershed-wide trash cleanup that brings together hundreds of volunteers each year at dozens of parks, tributaries, and access points along the Chattahoochee River. Last year, volunteers removed 1,200-pounds of trash from the river and trails at Overlook Park.
There are many sites available: : https://chattahoochee.org/sweep-the-hooch/sth2022/
Original source can be found here.