The John Day River is the longest river that is entirely within Oregon. See also List of rivers of Oregon and List of longest streams of Oregon. Pennsylvania Ohio River – Susquehanna River – Allegheny River – Delaware River – West Branch Susquehanna River – Genesee River – Schuylkill River – Youghiogheny River – Monongahela River – Raystown Branch Juniata River – The West Branch Susquehanna River is the longest river that is entirely within Pennsylvania. See also List of rivers of Pennsylvania. Rhode Island Blackstone River – Pawcatuck River – Wood River – Moosup River – Ten Mile River – Mill River – Woonasquatucket River – Sakonnet River – Ponaganset River – Pawtuxet River – The Woonasquatucket River is the longest river that is entirely within Rhode Island. See also List of rivers of Rhode Island. South Carolina Savannah River – Pee Dee River – Catawba River – Edisto River – Saluda River – Black River – Broad River – Santee River – Lynches River – Lumber River – The Edisto River is the longest river that is entirely within South Carolina. See also List of rivers of South Carolina. South Dakota Missouri River – James River – White River – Little Missouri River – Big Sioux River – Cheyenne River – Moreau River – Belle Fourche River – Little White River – Bad River – The Moreau River is the longest river that is entirely within South Dakota. See also List of rivers of South Dakota. Tennessee Mississippi River – Cumberland River – Tennessee River – Clinch River – Duck River – Hatchie River – French Broad River – Elk River – Hiwassee River – Caney Fork – The Duck River is the longest river that is entirely within Tennessee. See also List of rivers of Tennessee. Texas Rio Grande – Red River – Pecos River – Canadian River – Colorado River – Brazos River – Trinity River – Sabine River – Neches River – Nueces River – The Colorado River is the longest river that is entirely within Texas. See also List of rivers of Texas. Utah Colorado River – Green River – San Juan River – Sevier River – Bear River – Dolores River – Blacks Fork – Virgin River – White River – Price River – The Sevier River is the longest river that is entirely within Utah. See also List of rivers of Utah.