Ipsoot Lake is located in North Cascades National Park, in the U.S. state of Washington. Ipsoot Lake is adjacent to Snoqualmie National Forest and approximately northwest of Green Lake and southwest of Hagan Mountain.
The name for the lake comes from the Chinook Jargon word ipsoot meaning "to hide" or "hidden". The lake was originally named Hidden Lake, but was changed to avoid confusion with the other Hidden Lake in the National Forest.
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