2017 Map of Tin Cup Lake

About this map

The boundary between Montana and Idaho cuts through this high-elevation wilderness, following the high ridges of the Bitterroot Mountains. In 2017, the landscape remained largely defined by the protected lands of the Bitterroot National Forest and the Nez Perce National Forest. Water features dominate the geography, notably Tin Cup Lake and the cascading waters of Patsy Ann Falls. The area is carved by a complex network of drainages including White Cap Cr, Canyon Cr, and Triple Cr. These headwaters flow away from the continental divide through steep valleys. High points such as Vance Mtn provide significant landmarks for navigation within the forest, while the smaller White Cap Lakes highlight the glacial history of the terrain. This map captures the remote character of the state line at a time when traditional topographical features were being recorded with modern precision.