http://openspacestl.org/trash-bash/

Registration Required. The registration link is listed above

The Open Space Council for the St. Louis Region has partnered with Great Rivers Greenway, MSD Project Clear, the River des Peres Watershed Coalition, and Earthways Center to help clean up the rivers and creeks within the River des Peres Watershed. You can also choose to mark a storm drain inlet. Storm drain marking kits will be provided at your selected location from October 16th to October 23. This free event will be located at various sites throughout River des Peres. Contact bonnie@openspacestl.org for more information.