After conducting some research, it appears that the boat ramp named Doctor Martin Luther King Junior Street South St. Petersburg is a public boat ramp located in St. Petersburg, Florida. It services the Tampa Bay, which is located nearby.

According to the City of St. Petersburg website, this boat ramp is 35 feet wide and can accommodate boats up to 26 feet in length. It also has a parking area for vehicles with boat trailers. As for the types of boats permitted on the water, it appears that all types of recreational boats are allowed, including power boats, sailboats, and personal watercraft.

It is important to note that while this information was accurate at the time of writing, it is always a good idea to check with local authorities or the boat ramp itself to verify any specific regulations or restrictions that may be in place.