Island Lakes are a set of closely related freshwater lakes located on a prominent valley at the western base of Pratt Mountain, between Mount Defiance and Bandera Mountain,[3] in King County, Washington.

Because of its proximity to Snoqualmie Pass and other prominent peaks in the Alpine Lakes Wilderness,[6] the lakes are a popular area for hiking, swimming, and fishing rainbow trout.

[7][8][1] Access to Island Lakes is through Mount Defiance Trail 1009, which is an offshoot of Pratt Lake Trail 1007.

Rainbow Lake is 6 acres (2.4 ha) and located at the western base of Pratt Mountain, east of Mount Defiance.

[7] It is located on the south side of the Mason Lake Trail, shortly after it splits south towards Island Lake.