Abstract: This dataset is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of Maine. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 1.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 3/01/02"(http://www.ftw.nrcs.usda.gov/huc_data.html). Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level sub-watersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow modification. Arcs are attributed with the highest hydrologic unit code for each watershed, linesource and a metadata reference file.
Purpose: The Watershed and Subwatershed hydrologic unit boundaries provide a uniquely identified and uniform method of subdividing large drainage areas. The smaller sized 6th level sub-watersheds (up to 40,000 acres) are useful for numerous application programs supported by a variety of local, State, and Federal Agencies. This data set is intended to be used as a tool for water-resource management and planning activities, particularly for site-specific and localized studies requiring a level of detail provided by large-scale map information. The dataset will be appended to a larger seamless nationally consistant geospatial database as other states complete their portion of the watershed boundary dataset.

Progress: Complete
Update Frequency: Unknown

Theme Keywords: None, HUC, Hydrologic Units, Hydrologic Unit Code, Region, Sub-region, Basin, Sub-basin, Watershed, Watershed Boundaries, boundaries, Subwatershed, WBD, Watershed Boundary Dataset
Place Keywords: Maine, Kennebec River, St. John River, Allagash River, Fish River, Aroostook River, Prestile Stream, Meduxnekeag River, Penobscot River, Mattawamkeag River, Piscataquis River, Androscoggin River, Dead River, St. Croix River, Coastal Hancock/Washington Drainages, Coastal Drainages East of Small Point, Presumpscot River, Casco Bay, Saco River, York County Coastal/Portsmouth Harbor, Passamaquoddy Bay, Bay of Fundy

Access Constraints: None
Usage Constraints: The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. It is strongly recommended that this data is directly acquired from the distributor and not indirectly through other sources which may have changed the data in some way. These data should not be used at scales greater than 1:24,000 for the purpose of identifying hydrographic watershed boundary feature locations in 7. 5 should be acknowledged as the data source in products derived from these data. The 7 Watershed Boundary Dataset is public information and may be interpreted by all organizations, agencies, units of government, or others based on needs; however, they are responsible for the appropriate application of the data. Federal, State, or local regulatory bodies are not to reassign to the Natural Resources Conservation Service any authority for the decisions they make. The Natural Resources Conservation Service will not perform any evaluations of these maps or purposes related solely to State or local regulatory programs. Photographic or digital enlargement of these maps to scales greater than that at which they were originally delineated can result in misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the small scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest version of the data from the source distributor.