Alaska water resource region explained

The Alaska water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. 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 Alaska region, which is listed with a 2-digit hydrologic unit code (HUC) of 19, has an approximate size of 720535sqmi, and consists of 6 subregions, which are listed with the 4-digit HUCs 1901 through 1906.^[3]

This region includes the drainage within the state of Alaska. Includes all of Alaska.^[3]

List of water resource subregions

Subregion HUC^[4]	Subregion Name	Subregion Description	Subregion Location	Subregion Size	Subregion Map
1901		The North Slope drainage within the United States that discharges into the Arctic Ocean, including the bays, islands, and associated waters, from the Alaska-Yukon international boundary to Cape Lisburne.	Alaska	81000sqmi
1902		The coastal drainage from Cape Lisburne to the Yukon River Basin boundary, including the bays, sounds, islands, and associated waters; and St. Lawrence Island.	Alaska	75000sqmi
1903		The Yukon River Basin within the United States, including its delta.	Alaska	204000sqmi
1904		The coastal drainage from the Yukon River Basin boundary to Kupreanof Point on the Alaska Peninsula, including the bays, islands, and associated waters; and the islands of St. Matthew, Nunivak and Pribilof, and all of the Aleutian Islands.	Alaska	124000sqmi
1905		The coastal drainage within the United States from Kupreanof Point on the Alaska Peninsula to the Alaska-Yukon international boundary and southward to Point Riou, including the bays, islands, sounds, and associated waters.	Alaska	99000sqmi
1906		The coastal drainage within the United States from Point Riou to the Alaska-British Columbia international boundary, including the bays, islands, sounds, and associated waters.	Alaska	49000sqmi

See also

• List of rivers in the United States
• Water resource region

Notes and References

1. Web site: Science in Your Watershed - Locate Your Watershed. USGS. 2016-10-12.
2. Web site: Hydrologic Unit Maps. USGS. 2016-10-12.
3. Web site: Boundary Descriptions and Names of Regions, Subregions, Accounting Units and Cataloging Units . . water.usgs.gov . 2016-10-12.
4. Web site: McManamay RA, Bevelhimer MS, Kao SC, Yaxing W, Martinez-Gonzalez M, Samu N. National Hydropower Asset Assessment Environmental Attribution. USGS-Oak Ridge National Laboratory. 2016-10-12. 2013.