RIVERKEEPER SWEEP Posted on April 9, 2022April 9, 2022 by Admin Registration for the 11th Annual Riverkeeper Sweep is now open! BE SURE TO SIGN UP HERE at our Castleton-on-Hudson: Riverfront Park, Rensselaer County site. MAKE A DIFFERENCEMAY 7th, 2022RIVERFRONT PARK, Castleton-on-Hudson (Main St. & Scott Ave.)Come clean your River! We welcome you to take part in the 11th Annual Riverkeeper Sweep, our annual day of service for the Hudson River and its tributaries. Join our annual river shoreline and parkland cleanup effort.