Disappearing LakeFeb. 25, 2017 3:30 a.m.South Prairie is a mysterious 85-acre lake in the Gifford Pinchot National Forest of SW Washington. It appears each spring, and disappears each summer. What’s the secret of this unique geologic phenomenon?THANKS TO OUR SPONSOR:Become a SponsorTHANKS TO OUR SPONSOR:Become a Sponsor📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up