Rock Lake is steeped in mystery, but offers a variety of fish species; most notably being German Brown Trout. The water does not freeze, even in extreme temperatures. The Indian tribes think this to be caused by the underwater sea creatures believed to have consumed individuals and even whole tribes. In addition to sea creatures, it is told that a train carrying Model T cars derailed and resides at the bottom of the lake. Though searches have taken place, the train has never been discovered. Needless to say, this lake is an adventure. It is surrounded almost entirely by private land, so shore fishing is primarily limited to the boat launch area. Calling the launch a launch is being generous. Extreme care must be taken when launching boats of any size as the launch is not maintained and can be difficult to get a boat in or out. Also, use extreme caution when navigating your boat on the water. Water depth can fluctuate quickly and significantly. Many anglers' boat props have found a rock shelf in this water. There is a reason it is called "Rock" Lake. Access difficulties aside, this is a wonderful body of water for Brown Trout especially in the early morning and evenings. The browns average about 12-15", but expect to land some over 20". In addition to its population of browns, the lake boasts many other species of fish including Rainbow Trout.