After conducting research, I was unable to find any information on a boat ramp specifically named Pattagansett Lake in Connecticut. It is possible that the ramp may have a different official name or may not be a designated ramp at all.

However, there is a public boat launch located on Pattagansett Lake Road in East Lyme, Connecticut, which is situated on the shores of Pattagansett Lake. This launch is managed by the Connecticut Department of Energy and Environmental Protection and provides access for small boats and canoes/kayaks. There is no mention of any restrictions on the types of boats allowed on the lake, but it is important to note that the lake is relatively small (approximately 75 acres) and may not be suitable for larger boats.

In terms of the width of the boat ramp, this information is not readily available. It is recommended that those interested in utilizing the launch contact the Connecticut DEEP or visit the site in person to gather more specific details.