Sulphide Lake is located in North Cascades National Park, in the U. S. state of Washington. Sulphide Lake lies in a cirque on the southeast slopes of Mount Shuksan. Several major cascades drop as much as into Sulphide Lake including Sulphide Basin Falls which is from melt off the Sulphide Glacier. After Sulphide Creek drains from Sulphide lake, it then plunges at least over a series of cascades called Sulphide Creek Falls, which is one of the tallest waterfalls in the U.S.