The Watershed Alliance of Southwest Washington will host a litter clean-up from 9 a.m. to 11:30 a.m. April 6 at the Ridgefield Waterfront Boat Ramp, 5 Mill St., Ridgefield. Volunteers should wear closed-toed shoes, dress for the weather and bring snacks and water. Tools, litter pickers, and gloves will be provided. Learn more at thewatershedalliance.org.