Region
United States
1,477
Colorado
595
California
350
Florida
234
Texas
179
Wisconsin
156
Kansas
143
Oregon
140
Minnesota
136
New York (State)
132
Washington (State)
125
Ohio
119
Pennsylvania
114
North Carolina
110
Idaho
107
Colorado River Watershed (Colo.-Mexico)
94
Arizona
93
New Jersey
93
Massachusetts
83
Montana
83
Missouri
81
Nevada
79
Utah
76
Wyoming
74
Georgia
71
Illinois
70
New Mexico
69
Louisiana
68
Michigan
67
Virginia
63
Indiana
62
Mexico, Gulf of
61
Nebraska
60
Alaska
59
Arkansas
59
Mississippi River Watershed
59
Missouri River Watershed
55
South Dakota
54
Kentucky
53
Iowa
51
Maryland
48
South Carolina
48
Oklahoma
47
North Dakota
45
Connecticut
42
Great Lakes (North America)
42
Tennessee
41
Hawaii
40
West (U.S.)
39
Chesapeake Bay Watershed
38
more ...