1986 Map of O'Sullivan Dam

About this map

Potholes Reservoir dominates the northern landscape of this mid-1980s survey, representing a significant hydraulic alteration to the central Washington basin. The terrain transitions from the high elevations of the Frenchman Hills down the Royal Slope, where irrigation and drainage patterns are meticulously recorded. Below the dam, the Columbia National Wildlife Refuge preserves a complex network of aquatic environments including Upper Goose Lake and Lower Goose Lake. This area, managed through various designations like the Seep Lakes Habitat Management Area, showcases the managed water systems where Crab Creek and its tributaries like Levee Creek flow through the basin. Numerous smaller water bodies such as Blythe Lake and Chukkar Lake are scattered throughout the refuge, highlighting the intersection of industrial water management and wildlife conservation.