May 2, 2026, 9:00 am to 12:00 pm

Join Hudson Valley Stream Conservancy, Green Ossining and Riverkeeper for a cleanup at Sing Sing Kill from 9:00 am to 12:00 pm for the 15th Annual Riverkeeper Sweep. This is a rain or shine event.

Volunteers will meet at the entrance to Sing Sing Kill Greenway at 95 Broadway, Ossining, NY. Parking is available at the recreation center next to the Greenway gate away from the building.

We recommend all Sweep volunteers to bring a hat, sunscreen, a full reusable water bottle, insect repellent, work gloves and hand sanitizer. Please bring rubber boots if possible. We will also have many boots, hip waders and chest waders available.

This site is not suitable for elementary-aged children.

Questions? Contact Riverkeeper at This e-mail address is being protected from spambots. You need JavaScript enabled to view it or Gareth Hougham at This e-mail address is being protected from spambots. You need JavaScript enabled to view it or 914-954-9447.

*IMPORTANT! To ensure the safety of volunteers, Sweep Site Leaders, professional staff, and our communities, we ask that volunteers adhere to the following guidelines:

• Volunteers are required to pre-register for Sweep.
• Volunteers should not participate if they have ANY signs of illness.

Over the last 14 years, Sweep leaders have completed 1,463 projects, bringing together thousands of volunteers from NYC to the Adirondacks to clean up 404 tons of debris, and plant and maintain 11,425 native trees, shrubs, and flowers. This incredible effort is made possible by the generosity of Riverkeeper's members, sponsors, and donors. If you would like to support the continued growth of the Riverkeeper Sweep, please consider joining Riverkeeper or making a donation. Contributions of any amount are meaningful.