2023 Map of McMullen Basin

About this map

McMullen Basin and the southern slopes of the Snake River Plain define this high-desert landscape in southern Idaho. The area is characterized by a complex network of seasonal watercourses and springs, essential for land management within the Sawtooth National Forest. Significant water management features include several upland impoundments such as Dry Fork Reservoir, Curtis Reservoir, and the Upper Burnt Creek Reservoir. These reservoirs, along with drainage systems like Dry Cottonwood Creek and McMullen Creek, reflect the region's reliance on managed water resources for ranching and forest conservation. The topography is marked by distinctive landforms like Huja Hundu and North Cottonwood Ridge, which separate the various basins. For those studying the hydrology of Twin Falls County, the map identifies numerous specific water sources including Moonshine Spring, Goat Springs, and Rice Creek Spring, providing a precise look at the natural and man-made water distribution across this section of the Idaho backcountry.