Fern Lake is an alpine lake in Larimer County, Colorado, United States. It is a major source for the Big Thompson River.

Fern Lake
Location of Fern Lake in Colorado, USA.
Location of Fern Lake in Colorado, USA.
Fern Lake
Location of Fern Lake in Colorado, USA.
Location of Fern Lake in Colorado, USA.
Fern Lake
LocationRocky Mountain National Park, Larimer County, Colorado, US
Coordinates40°20′12″N 105°40′35″W / 40.33667°N 105.67639°W / 40.33667; -105.67639
Primary outflowsBig Thompson River
Basin countriesUnited States
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