Region
United States
468
Colorado
306
California
230
Florida
176
Texas
144
Wisconsin
121
Kansas
115
Minnesota
109
Oregon
109
New York (State)
105
Washington (State)
99
Pennsylvania
85
North Carolina
84
Ohio
82
New Jersey
77
Idaho
75
Colorado River Watershed (Colo.-Mexico)
72
Nevada
71
Missouri
69
Arizona
67
Utah
63
Wyoming
62
Illinois
55
Mexico, Gulf of
55
Missouri River Watershed
55
Mississippi River Watershed
54
Georgia
52
Louisiana
52
Virginia
52
Massachusetts
51
New Mexico
51
Arkansas
49
Montana
49
Nebraska
47
Indiana
45
Michigan
44
Alaska
43
South Dakota
42
Oklahoma
38
Kentucky
37
Connecticut
36
South Carolina
35
Iowa
34
Maryland
34
North Dakota
34
Tennessee
31
West Virginia
30
Alabama
29
Southern States
25
Hawaii
23
more ...