Long Lost Lake is located in Clearwater County, Minnesota, United States. The lake has one concrete-slab public access on its east side.
The closed-basin lake's water level rose over between 1993 and 2002, submerging residences, roads, and about of land. From its 2002 high of , its level dropped to by 2025. Ordinary High Water Level (OHW) elevation is .
The Minnesota Department of Natural Resources stocked the lake with approximately 275,000 walleye fry most years between 2016 and 2024.
The 54-acre Long Lost Lake Wildlife Management Area is located on the east side of the lake and the smaller 20-acre Long Lost Lake South WMA is on its south shore.
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