Lake Mendota - Memorial Union boat ramp is located in Madison, Wisconsin and is operated by the University of Wisconsin. It is a concrete boat ramp that is 30 feet wide and extends into Lake Mendota. The ramp is open to the public and can accommodate a variety of watercraft, including motorized boats, kayaks, canoes, and sailboats.

Lake Mendota is the largest of the four lakes in Madison, Wisconsin and covers an area of 9,842 acres. The lake is a popular spot for boating, fishing, swimming, and other water activities. The boat ramp at Memorial Union provides easy access to the lake for boaters and anglers.

According to the latest information available, the boat ramp at Lake Mendota - Memorial Union is open from April 15th to October 31st each year. The ramp is free to use, but boaters must purchase a permit to park in the designated parking lot. The permits can be purchased online or at the Memorial Union Terrace office.

In terms of regulations, all watercraft must comply with Wisconsin boating laws and regulations, including safety equipment requirements and operating regulations. Additionally, the lake has specific speed limits and no-wake zones that must be observed by all boaters.

Overall, the boat ramp at Lake Mendota - Memorial Union is a well-maintained facility that provides easy access to a beautiful and popular recreational lake in Madison, Wisconsin.