Here is an event on saturday 9/24 needing volunteers to clean up debris from the banks of our 3 rivers. http://paddlewithoutpollution.com/

From their website:

Our goal is to organize approximately 60 kayaks and/or canoes to clean 26 miles of Ohio, Allegheny, and Monongahela River shoreline on September 24, 2011. This will be our first clean-up event. We need your help to make it a success! We’ll provide the trash bags, gloves, and a snack; you provide your boat and a willingness to get a little dirty, have some fun, and make a difference.