According to the latest information available online, the boat ramp named Marma in Port Saint Lucie, Florida is a public boat ramp that provides access to the North Fork of the St. Lucie River. It is located at latitude 27.32336998 and longitude -80.33280945.

The Marma boat ramp is described as a single-lane ramp with a concrete surface and a gradual slope. It is also reported to have a small parking lot that can accommodate up to 10 vehicles with trailers.

The width of the Marma boat ramp is not specified in the available information, but it is likely to be similar to other public boat ramps in the area, which typically range from 8 to 12 feet in width.

As for the kind of craft permitted on the water, the North Fork of the St. Lucie River is navigable by a variety of boats, including powerboats, sailboats, and canoes/kayaks. However, it is important to note that certain restrictions may apply, such as speed limits and no-wake zones, and boaters are advised to consult local regulations and signage before launching from the Marma boat ramp.

In summary, the Marma boat ramp in Port Saint Lucie, Florida is a public ramp providing access to the North Fork of the St. Lucie River. It is a single-lane ramp with a concrete surface and a small parking lot, and is suitable for a range of watercraft including powerboats, sailboats, and canoes/kayaks.