All river data comes from the NHDPlus dataset, a geo-spatial, hydrologic framework dataset envisioned by the US Environmental Protection Agency. In order to understand the geography of the United States and how it has influenced the history of the country, it's important to know how to read and interpret a map. The first map of the United States that you'll need to become familiar with is the one below, which shows the country's important geographic features, such as lakes, rivers, and mountain ranges. Because two states, Alaska and Hawaii, are located so far away from the continental United States (the other 48 states), they will be shown in separate boxes on the bottom left in most of the maps in this interactive. The longest un-dammed river in the contiguous USA is the Yellowstone River; it is 692 miles long.

Rivers provide drinking water, irrigation water, transportation, electrical power, drainage, food, and recreation.
While some of the USA rivers and lakes serve as vital waterways for inland navigation others are useful sources of irrigation and power generation. Besides the USA rivers, the USA river map also shows the various lakes, streams and other water bodies in the USA. Symbols such as lines, colors, or pictures are often used in maps to represent geographical features, such as lakes, rivers, or mountains.
The longest river in the USA is the Missouri River; it is a tributary of the Mississippi River and is 2,540 miles long.

For certain cities like New Orleans, river basins usher in growth and prosperity for the city and its people.
The whole drainage topography of the USA may be divided into two main subsystems, namely the Eastern systems and the Pacific systems. Most of us don't go to that many different rivers in our lives, so when we see a number like that we might not realize just how many rivers and streams there are in the United States.

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