A work day is scheduled from 9 a.m. to 3 p.m. Saturday, Sept. 17, in the River Ridge Natural Area (RRNA).
Volunteers will meet at the RRNA parking lot across from Fox Valley Technical College on Godfrey Drive.
Organizers recommend that volunteers wear work clothes, sturdy shoes or boots and bring insect repellent, gloves and water to drink. Lunch will be provided.