This dataset includes hydrographic bodies of water (lakes/ponds, swamps/marshes, ice masses, playas, and estuaries) within the Lower Colorado region. This corresponds to region 15 (HUC level 2) in the national Watershed Boundary Dataset (WBD). This is an extract of the National Hydrography Dataset (NHD) - medium resolution (1:100,000 scale). For further information on the NHD dataset, see http://nhd.usgs.gov/
U.S. Geological Survey; Conservation Biology Institute
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