South Slough Estuary release – Charleston, Ore. — This March, adults and kids can participate in a variety of outdoor activities with South Slough Reserve. Available programming includes: Birds on the Estuary—March 10, 10 to 11:30 a.m. – Explore the shores of Charleston in search of winged wildlife. Interpreter, binoculars, and spotting scopes provided. Meet at the Charleston Visitor Center located at 91141 Cape Arago Hwy. The event is free; however, registration is required, and the event is limited to 15 participants.