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U.S. River Basins

Contiguous U.S. Major River Basins as designated by the U.S. Water Resources Council

Pacific Northwest Basin (201)
Idaho (10)
  • 1. Panhandle
  • 2. North Central Prairies
  • 3. North Central Canyons
  • 4. Central Mountains
  • 5. Southwestern Valleys
  • 6. Southwestern Highlands
  • 7. Central Plains
  • 8. Northeastern Valleys
  • 9. Upper Snake River Plains
  • 10. Eastern Highlands
Montana (24)
  • 1. Western
  • 2. Southwestern
  • 3. North Central
  • 4. Central
  • 5. South Central
  • 6. Northeastern
  • 7. Southeastern
Oregon (35)
  • 1. Coastal Area
  • 2. Willamette Valley
  • 3. Southwestern Valleys
  • 4. Northern Cascades
  • 5. High Plateau
  • 6. North Central
  • 7. South Central
  • 8. Northeast
  • 9. Southeast
Washington (45)
  • 1. West Olympic Coast
  • 2. North East Olympic San Juan
  • 3. Puget Sound Lowlands
  • 3. Puget Sound Lowlands
  • 4. East Olympic Cascade Foothills
  • 5. Cascade Mountains West
  • 6. East Slope Cascades
  • 7. Okanogan Big Bend
  • 8. Central Basin
  • 9. Northeastern
  • 10. Palouse Blue Mountains
Wyoming (48)
  • 2. Snake Drainage
  • 3. Green and Bear Drainage
  • 1. Yellowstone Drainage
  • 4. Big Horn
  • 5. Powder, Little Mo and Tongue Drainages
  • 6. Belle Fourche Drainage
  • 7. Cheyenne Niobrara Drainage
  • 8. Lower Platte
  • 9. Wind River
  • 10. Upper Platte
California River Basin (202)
California (4)
  • 1. North Coast Drainage
  • 2. Sacramento Drainage
  • 3. Northeast Interior Basins
  • 4. Central Coast Drainage
  • 5. San Joaquin Drainage
  • 6. South Coast Drainage
  • 7. Southeast Desert Basins
Great Basin (203)
Nevada (26)
  • 1. Northwestern
  • 2. Northeastern
  • 3. South Central
  • 4. Extreme Southern
Utah (42)
  • 1. Western
  • 3. North Central
  • 4. South Central
  • 5. Northern Mountains
  • 2. Dixie
  • 6. Uinta Basin
  • 7. Southeast
Lower Colorado River Basin (204)
Arizona (2)
  • 1. Northwest
  • 2. Northeast
  • 3. North Central
  • 4. East Central
  • 5. Southwest
  • 6. South Central
  • 7. Southeast
Upper Colorado River Basin (205)
Colorado (5)
  • 2. Colorado Drainage
  • 5. Rio Grande Drainage
  • 1. Arkansas Drainage
  • 3. Kansas Drainage
  • 4. Platte Drainage
New Mexico (29)
  • 1. Northwestern Plateau
  • 2. Northern Mountains
  • 4. Southwestern Mountains
  • 5. Central Valley
  • 6. Central Highlands
  • 7. Southeastern Plains
  • 8. Southern Desert
  • 3. Northeastern Plains
Rio Grande River Basin (206)
Texas (41)
  • 5. Trans Pecos
  • 2. Low Rolling Plains
  • 3. North Central
  • 4. East Texas
  • 6. Edwards Plateau
  • 7. South Central
  • 8. Upper Coast
  • 9. South
  • 10. Lower Valley
  • 1. High Plains
Texas Gulf Coast Basin (207)
Arkansas-White-Red Basin (208)
Arkansas (3)
  • 1. Northwest
  • 2. North Central
  • 4. West Central
  • 7. Southwest
  • 3. Northeast
  • 5. Central
  • 6. East Central
  • 8. South Central
  • 9. Southeast
Kansas (14)
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
  • 1. Northwest
  • 2. North Central
  • 3. Northeast
  • 4. West Central
  • 5. Central
  • 6. East Central
Louisiana (16)
  • 1. Northwest
  • 4. West Central
  • 2. North Central
  • 3. Northeast
  • 5. Central
  • 6. East Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
Missouri (23)
  • 4. West Ozarks
  • 5. East Ozarks
  • 6. Bootheel
  • 1. Northwest Prairie
  • 3. West Central Plains
  • 2. Northeast Prairie
Oklahoma (34)
  • 1. Panhandle
  • 2. North Central
  • 3. Northeast
  • 4. West Central
  • 5. Central
  • 6. East Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
Lower Mississippi River Basin (209)
Mississippi (22)
  • 1. Upper Delta
  • 2. North Central
  • 4. Lower Delta
  • 5. Central
  • 7. Southwest
  • 3. Northeast
  • 6. East Central
  • 8. South Central
  • 9. Southeast
  • 10. Coastal
Tennessee (40)
  • 4. Western
  • 1. Eastern
  • 2. Cumberland Plateau
  • 3. Middle
Missouri River Basin (210)
Iowa (13)
  • 1. Northwest
  • 4. West Central
  • 7. Southwest
  • 2. North Central
  • 3. Northeast
  • 5. Central
  • 6. East Central
  • 8. South Central
  • 9. Southeast
Nebraska (25)
  • 1. Panhandle
  • 2. North Central
  • 3. Northeast
  • 5. Central
  • 6. East Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
North Dakota (32)
  • 1. Northwest
  • 4. West Central
  • 5. Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
  • 2. North Central
  • 3. Northeast
  • 6. East Central
South Dakota (39)
  • 1. Northwest
  • 2. North Central
  • 3. Northeast
  • 4. Black Hills
  • 5. Southwest
  • 6. Central
  • 7. East Central
  • 8. South Central
  • 9. Southeast
Souris-Red-Rainy Basin (211)
Minnesota (21)
  • 1. Northwest
  • 2. North Central
  • 3. Northeast
  • 4. West Central
  • 5. Central
  • 6. East Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
Upper Mississippi River Basin (212)
Illinois (11)
  • 1. Northwest
  • 2. Northeast
  • 3. West
  • 4. Central
  • 5. East
  • 6. West Southwest
  • 8. Southwest
  • 7. East Southeast
  • 9. Southeast
Indiana (12)
  • 1. Northwest
  • 2. North Central
  • 3. Northeast
  • 4. West Central
  • 5. Central
  • 6. East Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
Wisconsin (47)
  • 1. Northwest
  • 2. North Central
  • 4. West Central
  • 5. Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
  • 3. Northeast
  • 6. East Central
  • 6. East Central
Great Lakes Basin (213)
Michigan (20)
  • 1. West Upper
  • 2. East Upper
  • 2. East Upper
  • 3. Northwest Lower
  • 4. Northeast Lower
  • 5. West Central Lower
  • 6. Central Lower
  • 7. East Central Lower
  • 8. Southwest Lower
  • 9. South Central Lower
  • 10. Southeast Lower
New York (30)
  • 1. Western Plateau
  • 3. Northern Plateau
  • 7. Champlain Valley
  • 8. St. Lawrence Valley
  • 9. Great Lakes
  • 10. Central Lakes
  • 2. Eastern Plateau
  • 4. Coastal
  • 4. Coastal
  • 5. Hudson Valley
  • 6. Mohawk Valley
Ohio (33)
  • 1. Northwest
  • 2. North Central
  • 3. Northeast
  • 4. West Central
  • 5. Central
  • 6. Central Hills
  • 7. Northeast Hills
  • 8. Southwest
  • 9. South Central
  • 10. Southeast
Vermont (43)
  • 1. Northeastern
  • 2. Western
  • 3. Southeastern
Tennessee River Basin (214)
Alabama (1)
  • 1. Northern Valley
  • 2. Appalachian Mountain
  • 3. Upper Plains
  • 4. Eastern Valley
  • 5. Piedmont Plateau
  • 6. Prairie
  • 7. Coastal Plain
  • 8. Gulf
North Carolina (31)
  • 1. Southern Mountains
  • 2. Northern Mountains
  • 3. Northern Piedmont
  • 4. Central Piedmont
  • 5. Southern Piedmont
  • 6. Southern Coastal Plain
  • 7. Central Coastal Plain
  • 8. Northern Coastal Plain
Virginia (44)
  • 6. Southwestern Mountain
  • 3. Western Piedmont
  • 1. Tidewater
  • 2. Eastern Piedmont
  • 4. Northern
  • 5. Central Mountain
Ohio River Basin (215)
Kentucky (15)
  • 1. Western
  • 2. Central
  • 3. Blue Grass
  • 4. Eastern
Maryland (18)
  • 8. Allegheny Plateau
  • 1. Southeastern Shore
  • 2. Central Eastern Shore
  • 3. Lower Southern
  • 4. Upper Southern
  • 5. Northeastern Shore
  • 6. North Central
  • 7. Appalachian Mountains
  • 7. Appalachian Mountains
Pennsylvania (36)
  • 9. Southwest Plateau
  • 10. Northwest Plateau
  • 1. Pocono Mountains
  • 2. East Central Mountains
  • 3. Southeastern Piedmont
  • 4. Lower Susquehanna
  • 5. Middle Susquehanna
  • 6. Upper Susquehanna
  • 7. Central Mountains
  • 8. South Central Mountains
West Virginia (46)
  • 1. Northwestern
  • 2. North Central
  • 3. Southwestern
  • 4. Central
  • 5. Southern
  • 6. Northeastern
South Atlantic-Gulf Basin (216)
Florida (8)
  • 1. Northwest
  • 2. North
  • 3. North Central
  • 4. South Central
  • 5. Everglades and Southwest Coast
  • 6. Lower East Coast
  • 7. Keys
Georgia (9)
  • 1. Northwest
  • 2. North Central
  • 3. Northeast
  • 4. West Central
  • 5. Central
  • 6. East Central
  • 7. Southwest
  • 8. South Central
  • 9. Southeast
South Carolina (38)
  • 1. Mountain
  • 2. Northwest
  • 3. North Central
  • 4. Northeast
  • 5. West Central
  • 6. Central
  • 7. Southern
Mid-Atlantic Basin (217)
Delaware (7)
  • 1. Northern
  • 2. Southern
New Jersey (28)
  • 1. Northern
  • 2. Southern
  • 3. Coastal
New England Basin (218)
Connecticut (6)
  • 1. Northwest
  • 2. Central
  • 3. Coastal
Maine (17)
  • 1. North
  • 2. South Interior
  • 3. Coastal
Massachusetts (19)
  • 1. West
  • 2. Central
  • 3. Coastal
  • 3. Coastal
New Hampshire (27)
  • 1. North
  • 2. South
Rhode Island (37)
  • 1. Rhode Island (Entire State)
  • 1. Rhode Island (Entire State)