The Missouri 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 Missouri region, which is listed with a 2-digit hydrologic unit code (HUC) of 10, has an approximate size of 520,960 square miles (1,349,300 square kilometers), and consists of 30 sub-regions, which are listed with the 4-digit HUCs 1001 through 1030.

This region includes the drainage within the United States of: (a) the Missouri River Basin, (b) the Saskatchewan River Basin, and (c) several small closed basins. Includes all of Nebraska and parts of Colorado, Iowa, Kansas, Minnesota, Missouri, Montana, North Dakota, South Dakota, and Wyoming.[3]

The Missouri region, with its 30 4-digit subregion hydrologic unit boundaries.

List of water resource subregions

Subregion HUC[4] Subregion Name[4] Subregion Description[3] Subregion Location[4] Subregion Size[4] Subregion Map
1001 Saskatchewan subregionThe Saskatchewan River Basin within the United States.Montana0,697 sq mi (1,810 km2)
HUC1001
HUC1001
1002 Missouri Headwaters subregionThe Headwaters of the Missouri River Basin above the confluence of and including the Gallatin, Jefferson, and Madison River Basins.Montana and Wyoming.14,100 sq mi (37,000 km2)
HUC1002
HUC1002
1003 Missouri–Marias subregionThe Missouri River Basin below then confluence of the Gallatin, Jefferson, and Madison River Basins to and including the Marias River Basin.Montana20,100 sq mi (52,000 km2)
HUC1003
HUC1003
1004 Missouri–Musselshell subregionThe Missouri River Basin below the confluence of the Marias River Basin to Fort Peck Dam.Montana23,700 sq mi (61,000 km2)
HUC1004
HUC1004
1005 Milk subregionThe Milk River Basin within the United States, including the Wild Horse Lake closed basin.Montana15,300 sq mi (40,000 km2)
HUC1005
HUC1005
1006 Missouri–Poplar subregionThe Missouri River Basin within the United States from Fort Peck Dam to the confluence with the Yellowstone River Basin.Montana10,800 sq mi (28,000 km2)
HUC1006
HUC1006
1007 Upper Yellowstone subregionThe Yellowstone River Basin above the confluence with the Bighorn River Basin.Montana and Wyoming.14,400 sq mi (37,000 km2)
HUC1007
HUC1007
1008 Big Horn subregionThe Big Horn River Basin.Montana and Wyoming.22,800 sq mi (59,000 km2)
HUC1008
HUC1008
1009 Powder–Tongue subregionThe Powder and Tongue River Basins.Montana and Wyoming.18,800 sq mi (49,000 km2)
HUC1009
HUC1009
1010 Lower Yellowstone subregionThe Yellowstone River Basin below the confluence with the Big Horn River Basin, excluding the Tongue and Powder River Basins.Montana and North Dakota.14,000 sq mi (36,000 km2)
HUC1010
HUC1010
1011 Missouri–Little Missouri subregionThe Missouri River Basin below the confluence with the Yellowstone River Basin to Garrison Dam.Montana, North Dakota, South Dakota, and Wyoming.17,300 sq mi (45,000 km2)
HUC1011
HUC1011
1012 Cheyenne subregionThe Cheyenne River Basin above the normal operating pool of Lake Oahe.Montana, Nebraska, South Dakota, and Wyoming.24,300 sq mi (63,000 km2)
HUC1012
HUC1012
1013 Missouri–Oahe subregionThe Missouri River Basin from Garrison Dam to Oahe Dam, excluding the Cheyenne River Basin above the normal operating pool of Lake Oahe.North Dakota and South Dakota.37,400 sq mi (97,000 km2)
HUC1013
HUC1013
1014 Missouri–White subregionThe Missouri River Basin from Oahe Dam to Fort Randall Dam.Nebraska and South Dakota.20,200 sq mi (52,000 km2)
HUC1014
HUC1014
1015 Niobrara subregionThe Niobrara River Basin and the Ponca Creek Basin.Nebraska, South Dakota, and Wyoming.13,900 sq mi (36,000 km2)
HUC1015
HUC1015
1016 James subregionThe James River Basin.North Dakota and South Dakota.21,500 sq mi (56,000 km2)
HUC1016
HUC1016
1017 Missouri–Big Sioux subregionThe Missouri River Basin from Fort Randall Dam to and including the Big Sioux River Basin, but excluding the Ponca Creek, Niobrara River, and James River Basins.Iowa, Minnesota, Nebraska, and South Dakota.13,900 sq mi (36,000 km2)
HUC1017
HUC1017
1018 North Platte subregionThe North Platte River Basin.Colorado, Nebraska, and Wyoming.30,900 sq mi (80,000 km2)
HUC1018
HUC1018
1019 South Platte subregionThe South Platte River Basin.Colorado, Nebraska, and Wyoming.23,900 sq mi (62,000 km2)
HUC1019
HUC1019
1020 Platte subregionThe Platte River Basin below the confluence of the North and South Platte River Basins, excluding the Elkhorn and Loup River Basins.Nebraska8,160 sq mi (21,100 km2)
HUC1020
HUC1020
1021 Loup subregionThe Loup River Basin.Nebraska15,000 sq mi (39,000 km2)
HUC1021
HUC1021
1022 Elkhorn subregionThe Elkhorn River Basin.Nebraska6,950 sq mi (18,000 km2)
HUC1022
HUC1022
1023 Missouri–Little Sioux subregionThe Missouri River Basin below the confluence with the Big Sioux River Basin to the confluence with the Platte River Basin.Iowa, Minnesota, and Nebraska.9,140 sq mi (23,700 km2)
HUC1023
HUC1023
1024 Missouri–Nishnabotna subregionThe Missouri River Basin below the confluence with the Platte River Basin to the confluence with the Kansas River Basin.Iowa, Kansas, Missouri, and Nebraska.13,300 sq mi (34,000 km2)
HUC1024
HUC1024
1025 Republican subregionThe Republican River Basin.Colorado, Kansas, and Nebraska.24,700 sq mi (64,000 km2)
HUC1025
HUC1025
1026 Smoky Hill subregionThe Smoky Hill River Basin.Colorado and Kansas.19,800 sq mi (51,000 km2)
HUC1026
HUC1026
1027 Kansas subregionThe Kansas River Basin, excluding the Republican and Smoky Hill River Basins.Kansas, Nebraska, and Missouri.15,000 sq mi (39,000 km2)
HUC1027
HUC1027
1028 Chariton–Grand subregionThe Chariton, Grand, and Little Chariton River Basins.Iowa and Missouri.10,900 sq mi (28,000 km2)
HUC1028
HUC1028
1029 Gasconade–Osage subregionThe Gasconade and Osage River Basins.Kansas and Missouri.18,400 sq mi (48,000 km2)
HUC1029
HUC1029
1030 Lower Missouri subregionThe Missouri River Basin below the confluence with the Kansas River Basin to the confluence with the Mississippi River, excluding the Chariton, Gasconade, Grand, and Osage River Basins.Kansas and Missouri.10,200 sq mi (26,000 km2)
HUC1030
HUC1030

See also

References

  1. "Science in Your Watershed - Locate Your Watershed". USGS. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
  2. "Hydrologic Unit Maps". USGS. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
  3. 1 2 "Boundary Descriptions and Names of Regions, Subregions, Accounting Units and Cataloging Units". USGS. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
  4. 1 2 3 4 McManamay RA, Bevelhimer MS, Kao SC, Yaxing W, Martinez-Gonzalez M, Samu N (2013). "National Hydropower Asset Assessment Environmental Attribution". USGS-Oak Ridge National Laboratory. Retrieved 2016-10-12. Public Domain This article incorporates text from this source, which is in the public domain.
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