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The length may depend on whether the center or the edge of the river is measured. It may not be clear how to measure the length through a lake or reservoir. Seasonal and annual changes may alter both rivers and lakes. Other factors that can change the length of a river include cycles of erosion and flooding, dams, levees, and channelization.
The longest rivers of the United States include 38 that have main stems of at least 500 miles (800 km) long. The main stem is "the primary downstream segment of a river, as contrasted to its tributaries". [1]
See also List of rivers of Idaho and List of longest streams of Idaho. Illinois ... Raritan River (including the length of the South Branch) – 121 miles (195 km)
The length measurements of many rivers are only approximations and differ from each other because there are many factors that determine the calculated river length, such as the position of the geographical source and the mouth, the scale of measurement, and the length measuring techniques (for details see also List of rivers by length). [2] [3]
List of drainage basins by area (including rivers, lakes, and endorheic basins); List of largest unfragmented rivers; List of longest undammed rivers; List of river name etymologies
List of longest rivers of the United States (by main stem) List of longest rivers of the United States by state; List of rivers of the United States by discharge; List of National Wild and Scenic Rivers; List of river borders of U.S. states; List of rivers of U.S. insular areas; List of rivers of the Americas by coastline
List of river systems by length; A. ... List of longest rivers of the United States (by main stem) This page was last edited on 20 March 2021, at 13:10 (UTC). Text ...
The list is at the outset limited to those rivers that are at least 250 km long from the most distant source, have a drainage basin (catchment area, watershed) of at least 10,000 km 2 (3,900 sq mi), or have a mean discharge (volume, flow) of at least 150 m 3 /s (5,300 cu ft/s). Also included are a number of rivers (currently 47) that do not ...