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2014 Map of O'Sullivan Dam

Name: 2014 Topographic Map of O'Sullivan Dam
Creator: U.S. Geological Survey
Published: 2014
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2014

About this map

The O'Sullivan Dam serves as the focal point for this 2014 survey of the central Washington landscape where the Frenchman Hills meet the Royal Slope. This region is defined by the massive Potholes Reservoir and a complex network of smaller water bodies such as Heron Lake, Falcon Lake, and Goldeneye Lake. The presence of the Goose Lake Wasteway and the Marsh Unit One wildlife area illustrates the managed hydrography of the Columbia Basin Project, where drainage and irrigation infrastructure has fundamentally shaped the local environment.

Road systems like Wa-262 and Road H Se provide access to the varied terrain, which transitions from the high ridges of the hills down to the lake-dotted depressions of the south. Genealogists and local historians can trace the intersection of the Grant Co and Adams Co border across this rugged territory. The map details numerous named features like Upper Goose Lake, Lower Goose Lake, and Hutchinson Lake, which highlight the importance of water management and recreation in this part of the state.