| States | River |
| Iowa and Illinois | |
| Oklahoma and Texas | |
| Oregon and Washington | |
| New York and New Jersey | |
| Arizona and California | |
| Indiana and Illinois | |
| Pennsylvania and New Jersey | |
| | States | River |
| Kentucky and Indiana | |
| Virginia and Maryland | |
| Nebraska and Iowa | |
| Idaho and Oregon | |
| New Hampshire and Vermont | |
| Texas and Louisiana | |
|