| States | River |
| Kentucky & West Virginia | |
| Washington & Oregon | |
| Illinois & Indiana | |
| South Dakota & Iowa | |
| Maryland & Virginia | |
| Texas & Louisiana | |
| South Carolina & Georgia | |
| Nebraska & Iowa | |
| Indiana & Kentucky | |
| | States | River |
| Missouri & Illinois | |
| Pennsylvania & New Jersey | |
| Texas & Coahuila (Mexico) | |
| California & Arizona | |
| Alabama & Georgia | |
| Oregon & Idaho | |
| North Dakota & Minnesota | |
| Vermont & New Hampshire | |
| Texas & Oklahoma | |
|