Lake Entiat (also known as Rocky Reach Reservoir) is a reservoir between Chelan County and Douglas County in North Central Washington, USA, that is formed above Rocky Reach Dam (built 1962), a hydroelectric dam on the Columbia River.

The reservoir is 17 mi (27 km) north of Wenatchee and stretches upstream to the Wells Dam.

Originally part of the mainland on the south bank of the Columbia, this rocky outcrop became an island when the lake formed.

[2] U.S. Highway 2 formerly ran through the area that became the island, and remnants of the road may still be seen in aerial photos.

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