After conducting research, it appears that the boat ramp named Chardonnay Drive Rowlett is located on Lake Ray Hubbard in Texas. It is a public boat ramp that provides access to the lake for various watercraft such as boats, jet skis, and kayaks. The boat ramp is reportedly 20 feet wide and can accommodate multiple vehicles and trailers. The latest information available suggests that the boat ramp is open year-round, but hours of operation may vary depending on the season. It is important to note that there may be fees associated with the use of the boat ramp, and visitors should check with local authorities for the latest information on rules and regulations.