Rock County Chapter

ROCK COUNTY
Hills, kettles and other landforms left by the most recent glacial advance comprise the northern third of Rock County. The best viewing location in the county is Storrs Lake State Wildlife Area. The Johnstown Moraine, which can be seen along the Ice Age Trail between Janesville and Milton, forms the southern boundary of this area. The moraine is named for a town in the eastern part of the county and extends north to Waushara County. The remainder of Rock County was glaciated more than 25,000 years ago.

Existing Ice Age Trail crosses the Rock River, which was a massive glacial meltwater river during the last glacial advance and retreat, in the city of Janesville.