Johnstown Estate With Private Lake Listed for $12.85 MillionThis Johnstown home has all of these features and more. Located in Johnstown, The Lake at Big Thompson checks all of the boxes for the ultimate dream home. Did we happen to mention there is a 28-acre private lake on the property with state record bluegill and green ear sunfish? Trophy walleye, largemouth and smallmouth bass, crappie, and catfish all reside in the private lake. Take a look at some of the many photos of The Lake at Big Thompson, located in Johnstown, Colorado.