Marsh Unit One Dam USGS O'Sullivan Dam Quad, Washington, Topographic Map

Marsh Unit One Dam is a Dam in the state of Washington (county of Grant), located at latitude - longitude coordinates (also known as lat-long or GPS coordinates) of N 46.9582 and W -119.26113. Marsh Unit One Dam is shown in the center of the topographic (topo) map, which is sourced from the United States Geographical Survey map USGS O'Sullivan Dam quad. The nearest major town is Warden, WA.