Lake Crescent is a deep lake located entirely within Olympic National Park in Clallam County, Washington, United States, approximately 17 miles (27 km) west of Port Angeles, Washington on U.S. Route 101 and nearby to the small community of Piedmont. At an official maximum depth of 624 feet (190 m), also the maximum depth of the depth sounder used to find that depth (see depth section), it is officially the second deepest lake in Washington.