Myrtle Lake is a freshwater lake located on the northern slope of Rampart Mountain East of Cow Creek Meadows, in Chelan County, Washington.

[1] Myrtle lake is located along the western shore of Entiat River and on the eastern slope of a steep hill that leads to Cow Creek Meadows above 5000 feet.

To the west, Myrtle lake is bordered by the Chelan Mountains.

Access to Myrtle Lake is through Cow Creek Trail #1404 which starts at the Entiat River Trailhead across the Cottonwood Guard Station along Forest Service Road 5100.

This affected the Entiat River Valley and the area that surrounds Myrtle lake.