Based on the latest information available, the boat ramp named Northeast 9th Street 504 in Coupeville, Washington is a concrete ramp that is approximately 16 feet wide. It is located on Penn Cove, which is a body of water that is part of Puget Sound. The ramp is suitable for launching and retrieving small watercraft such as kayaks, canoes, and small motorized boats. However, there may be restrictions on the use of the ramp depending on the season, weather conditions, and other factors. It is always advisable to check with local authorities or the managing agency for the most up-to-date information regarding the use of this boat ramp.