2017 Map of Lewis Creek

About this map

The Gallatin National Forest dominates this section of the Gallatin Range, where the steep mountain geography is defined by a dense network of drainages. The Gallatin Co Park Co line runs through the northern reaches, marking a high-elevation boundary near Swan Cr and Dry Cr. The landscape is characterized by its complex hydrology, with numerous named streams such as Lewis Creek, Big Creek, and the many branches of Little Donahue Creek cutting through the terrain. Human access is limited to rugged corridors like Hyalite Creek Rd and Big Creek Rd. A notable point of interest in this high country is Sunny Brook Spring, situated just east of the distinct geological shelf known as Cooper Bench. This survey provides a clear view of the wilderness management area before more recent environmental shifts, documenting the precise locations of remote watersheds including Fisher Creek A and Donahue Creek.