The second half of the Clearwater River is mainly influenced by volcanic activity, so lava plateaus and lava cliffs hem the river. Clearwater Lake was dammed by lava from an eruption called Dragon's Tongue about 7,600 years ago. Today, the river drops directly out of Clearwater Lake over high Osprey Falls which creates hazardous boating conditions at the lake's outlet. For the next , the Clearwater races through one rapid after another and over three more waterfalls, Myanth Falls, Marcus Falls and Bailey's Chute. Some of the more dramatic white-water sections are Gattling Gorge, Helmcken Canyon, Sabre Tooth, The Kettle, and Granite Canyon. The only extended section of calm water is called The Horseshoe, a long meander where the river almost inscribes a complete circle. Three mountains rise east of the Clearwater River: Battle Mountain, Trophy Mountain and Raft Mountain.