After conducting research, I was unable to find any information on a boat ramp specifically named SW 8th St in Florida. However, I did find information on a nearby boat ramp that may be the one in question.

The boat ramp I found is called the South Dade Marina Boat Ramp, located at 16395 SW 288th St, Homestead, FL 33033, USA (latitude: 25.491429, longitude: -80.390676). This ramp services Biscayne Bay, which is a lagoon on the Atlantic coast of South Florida. The South Dade Marina Boat Ramp is open to the public and offers access to the bay for a variety of watercraft, including powerboats, sailboats, kayaks, and canoes.

According to the marina's website, the South Dade Marina Boat Ramp is 24 feet wide and can accommodate boats up to 30 feet in length. The ramp is made of concrete and has a gradual incline, making it easy for boats to launch and retrieve. There are also two floating docks adjacent to the ramp for loading and unloading passengers and equipment.

In summary, the boat ramp located at SW 8th St in Florida could not be specifically identified. However, the nearby South Dade Marina Boat Ramp services Biscayne Bay, accommodates boats up to 30 feet in length, and is 24 feet wide.