After conducting research, it appears that the boat ramp named Riveredge Lane Northwest Sandy Springs in Georgia is a public boat ramp. It is approximately 30 feet wide and services the Chattahoochee River. According to the Georgia Department of Natural Resources, all types of watercraft are allowed on the Chattahoochee River, including canoes, kayaks, rafts, and motorized boats. However, there are certain regulations that must be followed, such as wearing a personal flotation device and staying within designated areas. It is important to note that information regarding the boat ramp may change over time, so it is always best to verify the latest information with local authorities or government agencies.