Sulphide Lake

{{Infobox body of water

|name = Sulphide Lake

|image = Sulphide Lake, Shuksan.jpg

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|location = North Cascades National Park, Whatcom County, Washington,
United States

|coords = {{coord|48|48|17|N|121|35|02|W|type:waterbody_region:US|display=inline,title}}{{cite gnis|id=1526689|name=Sulphide Lake|accessdate=June 29, 2013}}

|type = Glacial lake

|inflow =

|outflow = Sulphide Creek

|catchment =

|basin_countries = United States

|length = {{convert|.65|mi|abbr=on}}

|width = {{convert|.20|mi|abbr=on}}

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|elevation = {{convert|3806|ft|abbr=on}}

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| pushpin_map = Washington#USA

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| pushpin_map_alt = Location of Sulphide Lake in Washington, USA.

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Sulphide Lake is located in North Cascades National Park, in the U. S. state of Washington.{{Cite map|publisher=Topoquest (USGS Quads)|title=Mount Shuksan, WA|url=http://www.topoquest.com/map.php?lat=48.80476&lon=-121.58390&datum=nad83&zoom=4|accessdate=June 29, 2013}} Sulphide Lake lies in a cirque on the southeast slopes of Mount Shuksan. Several major cascades drop as much as {{convert|1000|ft|abbr=on}} 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 {{convert|2000|ft|abbr=on}} over a series of cascades called Sulphide Creek Falls, which is one of the tallest waterfalls in the U.S.{{cite web|title=Sulphide Creek Falls|publisher=Northwest Waterfall Survey|url=http://www.waterfallsnorthwest.com/nws/waterfall.php?num=407|accessdate=June 29, 2013}}

The lake is in a basin with near vertical walls and the rock is phyllite and greenschist. Above the lake on the cliffs below Crystal Glacier a 0.3 mile wide band stained red in color (from iron oxide) is exposed that runs for about 2.5 miles. This band is rich in the iron sulfides pyrite and pyrrhotite.[https://www.nps.gov/parkhistory/online_books/geology/publications/bul/1359/sec2f.htm Geology and Mineral Resources of the Northern Part of the North Cascades National Park, Washington.] Geological Survey Bulletin 1359. Presumably this is the source of the lake's name.