Park staff and volunteers will lend a hand to create a cleaner environment on Earth Day weekend! Help pick up litter in and around Big Bone Creek from 10 a.m. to 2 p.m. Meet at the Bison Circle Shelter a few minutes prior to complete volunteer forms. Volunteers should wear rubber boots or waders if they plan on entering the creek. Trash bags, rubber gloves, and trash grabbers will be provided by the park. Water and snacks will be provided to volunteers. This event is free and open to the public.