1990 Map of Poison Creek Slough

About this map

The Harney Valley floor is defined by a complex network of waterways and drainage features, as captured in this late-twentieth-century study of the high desert landscape. The Silvies River meanders through the southern reaches, feeding into a series of distinctive channels including Poison Creek Slough, Foley Slough, and Emigrant Slough. This intricate hydraulic system is managed by infrastructure like the Upper Hanley Dam Spillway, illustrating the efforts to control water flow across this level basin.