2017 Map of Threemile Hill

About this map

Merrill Springs Rim and Threemile Hill dominate this high-desert landscape in Oregon's remote southeast. The area is characterized by its vital water management infrastructure, featuring several irrigation and livestock sources including Saddle Butte Reservoir, Alkali Reservoir, and Hidden Reservoir. Transportation routes like the Old Ion Hwy and Lava Beds Rd cut across the arid terrain, providing access to landmarks such as Holdup Rock and Dixons Rock. The presence of the N Side Canal and S Side Canal drawing from Jordan Cr reveals the region's reliance on managed water systems to sustain ranching and agriculture in this volcanic and high-elevation environment. Geologic and land-use features like the Lequerica Trap further illustrate the human imprint on the high desert of Malheur County.