The Big Sioux River watershed is one of 14 watersheds in the State of South Dakota. It is located in the eastern part of our state, but portions of the watershed extends into southwestern Minnesota and northwestern Iowa (see map). Click here to learn more about the Big Sioux River watershed.
What is a watershed?

A watershed is simply defined as an area of land that drains water into a river, stream, lake, or ocean.
Did you know that the Big Sioux River watershed makes up a portion of the largest watershed in North America? Can you guess which river's watershed that is? (answer)
No matter where you are - at home, at work, on vacation - you will be in a watershed. Watersheds come in all sorts of shapes and sizes.
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Big Sioux River
Major Tributaries
Lakes
Miscellaneous