This section allows a user to preview and download Lake County Historical Contour Maps. The maps are arranged by the year, township, range and section. First, select an area and then choose an available township and range. Next, choose an available section. The high-resolution versions of the map images are large files and may take some time to download. A preview of each map image is provided to determine if it is the needed image before starting to download. Not all aerials have contours throughout.