Coldwater Lake Recreation Area is located 45 miles east of Castle Rock in the heart of the blast zone near the Science and Learning Center at Coldwater and Johnston Ridge Observatory . Experience the effect the May 18, 1980 eruption had on the Coldwater Valley, including creating a brand new lake. Kayaking is popular here. Combustion engines are prohibited on the lake, but anglers reach trophy trout by electric motors, rowing, or kicking. See Restrictions section. The 0.6 miles accessible Birth of a Lake Interpretive Trail allows visitors to enjoy close up views of Coldwater Lake. Accessible Adventures Video