1999 Map of Lake Marshall

Insight into the region's jurisdictional history is provided by the overlapping presence of the Flathead Indian Reservation and the Fourth Guide Meridian West. The topography is defined by significant landmarks like West Fork Point and Henry Mount, while primitive routes such as the Swan Lake Seeley Lake trail suggest the era's reliance on established wilderness corridors before modern development. Smaller features like Colt Lake and Beaver Lake are shown in their precise late-twentieth-century context.