2020 Map of Brewster Reservoir

About this map

The North Fork Owyhee River cuts a deep course across this high desert landscape, defining the transition from the Oregon plateaus into the Idaho borderlands. This 2020 survey documents a complex network of ranching infrastructure and water management, centered on the Brewster Reservoir and several smaller catchments like Little Groundhog Reservoir and Mule Lake Reservoir. The terrain is marked by significant geological features including Little Box Canyon and the Pole Creek Breaks near the state line. Settlement is sparse, characterized primarily by ranching access such as Fenwick Ranch Rd and wide-open tracts like Soldier Meadows. The map provides a contemporary view of the region's hydrology, from the Dutcher Spring headwaters to the Cougar Canyon Reservoir in the southwest corner.