This dataset includes hydrographic flowlines (streams/rivers, pipelines, connectors, canals/ditches, coastlines, underground conduits, and other artificial paths) within the Southern Mojave/Salton Sea sub-region. This corresponds to sub-region 1810 (HUC level 4) 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/
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