2020 Map of Tongue River Dam

About this map

The Tongue River Reservoir and its associated Tongue River Dam anchor the southeastern corner of this landscape in Rosebud and Big Horn Counties. This 2020 topographical study captures a high-plateau environment defined by a dense network of water sources and seasonal drainage systems, including the Tongue River and various forks of Fourmile Cr. The map details numerous specific springs, such as 07S40E07DADD01 Spring and 07S40E11BADC01 Spring, which reveal the hydrological patterns necessary for livestock and land use in this arid region. Transportation across the ridgelines and draws is facilitated by Montana Secondary Highway 566 and a network of rural routes like Tongue Dam Rd and Deer Creek Rd. Significant landmarks such as Barber Draw and Leaf Rock Cr help define the varied elevation and drainage basins flowing toward the reservoir.