Based on the latest information available, the boat ramp named Southwest 18th Avenue Boca Raton is located in the city of Boca Raton, Florida. It is a public boat ramp that provides access to the Intracoastal Waterway, which is a coastal canal system that runs parallel to the Atlantic Ocean and connects various bays, rivers, and inlets.

The Southwest 18th Avenue boat ramp is a single-lane ramp that is approximately 20 feet wide, making it suitable for launching small to medium-sized watercraft. It features a long dock that extends into the water and provides ample space for loading and unloading boats. The ramp is also equipped with a parking lot that can accommodate up to 20 vehicles with boat trailers.

As for the types of watercraft permitted on the Intracoastal Waterway, the regulations vary depending on the location. However, in general, the waterway is open to a wide range of recreational boats, including powerboats, sailboats, kayaks, canoes, and paddleboards. Boaters are expected to follow all safety guidelines and respect the environment by not littering or disrupting wildlife.

Overall, the Southwest 18th Avenue boat ramp is a well-maintained facility that offers convenient access to the Intracoastal Waterway for boaters in the Boca Raton area. Its location and amenities make it a popular spot for fishing, boating, and other water-based activities.