The Clearwater is the only full-sized replica of the 18th and 19th century merchant vessels known as Hudson River sloops. Owned and operated by the Hudson River Sloop Clearwater, Inc., a non-profit membership organization dedicated to defending and restoring the Hudson River and related waterways, the Clearwater has served as both a platform for hands-on environmental education and as a symbol for grassroots action, since 1969. She sails seven days a week, carrying as many as 50 passengers for three- to five-hour educational programs. Adults and children take part in a range of activities involving water life, water chemistry, sail raising, steering, piloting and more. A USCG licensed captain is in charge, and an education specialist directs the program. The crew is composed of professional deck crew, apprentices (ages 16 and older), an education assistant, and volunteers.