2020 Map of Garrison Lake

About this map

Catlow Valley dominates this high desert landscape in Harney County, where water management is central to the survival of the local cattle industry. The presence of Stockwater Ditch and several named ephemeral water bodies, including Garrison Lake, West Field Lake, and Sixmile Lake, underscores the seasonal nature of the region's hydrology. These basins and reservoirs, such as Threemile Reservoir, provide critical collection points for runoff from the surrounding drainages of Skull Cr and Threemile Cr. The landscape is largely defined by its township and range grid, with Catlow Valley Rd serving as the primary corridor through this sparsely populated basin. This 2020 update reflects a territory where traditional ranching infrastructure, such as ditching and stock water sources, remains the primary human footprint on the land.