Description:Silver Lake is approximately 4 miles in circumference and 100 feet deep. There have been eerie tales about the lake being bottomless. The elevation is 6,444 feet when full and a pump house at the end of a 200 foot causeway sends water to the Anaconda smelters by creek, flume and pipeline, some being pumped into Butte through a large buried pipeline from Anaconda. (http://www.rootsweb.com/~mtdeerlo/georgetown.htm)