ute ulay dam - download free 3d model blm national operations center geospatial imaging oc534 d59d25a mining complex located along alpine loop scenic byway just south lake city colorado claims were discovered 1871 one biggest producers gold silver san juan mountains bureau land management gunnison field office has partnered hinsdale county promote heritage tourism stabilized preserved several structures within listed register historic places 2017 constructed 1926 provide hydropower mill processed ores poured concrete measures 160 feet across reinforced woven rebar water forced into plant flume originating produced power using three turbine wheels used until 1951 collapsed