After conducting research, I was unable to find any information on a boat ramp named Highway 128 5374-5376, Roberta in Georgia. It is possible that the information provided is inaccurate or outdated.

However, in general, boat ramps can vary in size and width depending on their location and purpose. They can be made of concrete, asphalt, or gravel and are typically designed to accommodate a range of watercraft, from small fishing boats to larger vessels. The body of water that a boat ramp services can also vary, from lakes and rivers to bays and oceans.

In terms of regulations, different bodies of water and jurisdictions may have specific rules and restrictions regarding the types of boats and activities permitted. It is important to consult local resources and regulations before launching any watercraft.