About Diamond Lake

Diamond Lake is one of many natural lakes in northeastern Washington. Centuries ago, sand and gravel dislodged from a glacier to form a natural dam, which in turn created the freshwater lake that exists today. Diamond Lake is mostly spring fed and is part of the Little Spokane River watershed (outflow only) via runoff from the uninhabited west end of the lake. 

Diamond Lake’s exceptionally clear waters and warm weather attract visitors for a variety of summer activities. The lake often freezes during the winter, creating conditions that are ripe for snowmobiling, ice skating, cross-country skiing, and ice fishing. 

While Diamond Lake is small in size, at a mere 2.5 miles long and .5 miles wide, it is home to a surprising amount of fish. Augmented by the Washington Dept. of Fish and Wildlife, Diamond Lake is one of the most heavily stocked bodies of water in the state of Washington – an average of 20,000 rainbow trout and 10,000 triploid and brown trout are transplanted yearly. A free public boat launch is operated by the Washington Dept. of Fish and Wildlife.