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This first level of classification divides the United States into 21 major geographic areas, or regions. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers. [1] [2] The 21 first-level 2-digit region hydrologic unit boundaries.
Near the Bois de Sioux River [29] Montana: North Dakota: South Dakota: Marked with a red granite stone. [30] Montana: South Dakota: Wyoming: Marked with a stone within a fence. [31] Nebraska: South Dakota
Currently, the best source for nationwide LiDAR availability from public sources is the United States Interagency Elevation Inventory (USIEI). [1] The USIEI is a collaborative effort of NOAA and the U.S. Geological Survey, with contributions from the Federal Emergency Management Agency, the Natural Resources Conservation Service, the US Army Corps of Engineers, and the National Park Service.
President Barack Obama created or expanded 34 national monuments by proclamation, the most of any president, with over half a billion acres of public land and water protected. [7] [8] [5] National monuments are located in 33 states, Washington, D.C., the Virgin Islands, American Samoa, the Minor Outlying Islands, and the Northern Mariana Islands.
Georeferenced map images are available from the USGS as digital raster graphics (DRGs) in addition to digital data sets based on USGS maps, notably digital line graphs (DLGs) and digital elevation models (DEMs). In 2015, the USGS unveiled the topoView website, a new way to view their entire digitized collection of over 178,000 maps from 1884 to ...
The logo of the United States Geological Survey (USGS) The Geographic Names Information System (GNIS) is a database of name and location information about more than two million physical and cultural features throughout the United States and its territories; as well as the associated states of the Marshall Islands, Federated States of Micronesia, and Palau; and Antarctica.
The National Geodetic Survey (NGS) is a United States federal agency based in Washington, D.C. that defines and manages a national coordinate system, providing the foundation for transportation and communication, mapping and charting, and a large number of science and engineering applications.
The Red River drainage basin, with the Souris River highlighted Flooding in Minot on June 23. The 2011 Souris/Mouse River flood in Canada and the United States occurred in June and was greater than a hundred-year flooding event for the river. [1] [2] The US Army Corps of Engineers estimated the flood to have a recurrence interval of two to five ...