After conducting some research, I was unable to find any specific information about a boat ramp named U.S. 19 39620 in Tarpon Springs, Florida. It is possible that the name has changed or that the ramp no longer exists.

However, Tarpon Springs is known for its access to the Gulf of Mexico and several bodies of water, including the Anclote River, which flows into the gulf. There are several boat ramps in the area that provide access to these waterways.

In general, boat ramps in Florida are typically wide enough to accommodate a variety of watercraft, from small kayaks to large motorboats. However, the specific width of a boat ramp can vary depending on its location and design.

The types of boats that are permitted on the water in Florida can also vary depending on the specific body of water and any regulations that may be in place. However, common types of watercraft include motorboats, sailboats, kayaks, and canoes. It is important to note that some areas may have restrictions on certain types of boats or activities, such as fishing or water skiing.

Overall, while specific information about the U.S. 19 39620 boat ramp in Tarpon Springs is not available, there are likely several other boat ramps in the area that provide access to the surrounding waterways for a variety of boats and watercraft.