The National Hydrography Dataset is a partnership between the USGS and over 50 government agencies to produce a GIS dataset of the Nation's surface water. This dataset is designed to allow the analysis of water related events within the surface water network, such as the upstream/downstream relationship of permitted discharges, water quality monitoring stations, and drinking water intakes. The NHD provides the surface water geospatial framework upon which the events can be addressed, and related through the flow network. The NHD is also designed for use in mapping, allowing the user to construct customized surface water maps. The dataset is available nationwide at 1:100,000-scale, and is nearing completion at 1:24,000-scale. The NHD is designed for continuous maintenance through a stewardship program made up of data users and the USGS. This all-day workshop will give the user a comprehensive overview of the NHD enabling them to use the NHD in a variety of GIS applications. The workshop will cover: (1) How the NHD is used by various users across the Country, (2) Characteristics of the NHD, (3) Mapping with the NHD, (4) Flow navigation, (5) Linear Referencing, and (6) Network analysis.