Lyre River Falls, making a barrier in that direction. Over time, two different subspecies of fish evolved in the lake: the endemic Beardslee trout, a relative of rainbow trout, spawns in the Lyre River above the falls, while the Crescenti Cutthroat Trout spawns in Barnes Creek. Depth In the early 1960s, the U.S. Navy surveyed the lake using a Furuno depth sounder. They were not able to verify the maximum depth of their equipment. During a 1970 depth survey conducted by the students of the fisheries program at Peninsula College in Port Angeles, Washington, students used instruments that could not record measurements beyond a depth of , which thus became the "official" depth of the lake as recorded by the National Park Service. However, when power cable was being laid in the lake in the 1980s, instruments showed depths over , the maximum range of the equipment used. The Lake Crescent Bathymetric Survey: In 2013 and 2014, geographic data scientists Eian Ray and Jeff Enge performed a lake-wide bathymetric survey, taking over 5,000 depth soundings. GIS statistical analysis showed the lake contains approximately of freshwater. The deepest spot was shown to be deep. Much of the shoreline of the lake drops off steeply, in many cases a sheer underwater cliff face. During the Lake Crescent Bathymetric Survey, it was speculated that the erroneous depth record of from the 1980s was a result of the sonar signal reflecting off the steep underwater slopes near the shore. History It is not certain whether the lake was named for its crescent shape or for its proximity to Crescent Bay, which was named by Henry Kellett in 1846. In 1849 two British–Canadian fur trappers, John Sutherland and John Everett forged inland from Crescent Bay. The two lakes they found became known as Lake Sutherland and Everett Lake. Later, Everett Lake was renamed Lake Crescent. It has also been known as Big Lake and Elk Lake. In 1890, while the Port Crescent Improvement Company was promoting its townsite near the lake, M.J. Carrigan started the Port Crescent Leader to help boost the town. He wrote of the beautiful lake, which he called Lake Crescent, and the name soon became well-established. The lake was included in the Olympic Forest Reserve in 1897, designated as a recreation area in 1921, and finally included in Olympic National Park in 1938. Notable incidents In 1929, Russell and Blanch Warren