Avoid going on Schwatka Lake while water levels drop: Yukon Energy Yukoners are being asked to avoid going on the ice on Schwatka Lake starting Wednesday as ice breaks and fast flowing water are possible. Social Sharing CBC News · Marsh Lake is about 50 kilometres upstream from Schwatka Lake along the Yukon River. comments Yukoners are being asked to avoid going on the ice on Schwatka Lake starting Wednesday as ice breaks and fast flowing water are possible. Over the next week, water levels are expected to fall at Schwatka Lake as Yukon Energy continues to increase the flow of water through Miles Canyon and the Whitehorse dam as part of the effort to lower water levels on Marsh Lake, according to a news release.