Klawatti Lake is located in North Cascades National Park, in the U. S. state of Washington. Klawatti Lake is in a remote section of the park and well off any designated trails. Klawatti Lake was formed by the retreat of Klawatti Glacier and North Klawatti Glacier in the mid-1900s. During warmer months, melt from both the North Klawatti Glacier and Klawatti Glacier flows into Klawatti Lake. Klawatti Peak is west of the lake.