 To the north , the much lower Laurentian Divide separates the Missouri River watershed from those of the Oldman River , a tributary of the South Saskatchewan River , as well as the Souris , Sheyenne , and smaller tributaries of the Red River of the North . All of these streams are part of Canada 's Nelson River drainage basin , which empties into Hudson Bay . There are also several large endorheic basins between the Missouri and Nelson watersheds in southern Alberta and Saskatchewan . The Minnesota and Des Moines Rivers , tributaries of the upper Mississippi , drain most of the area bordering the eastern side of the Missouri River basin . Finally , on the south , the Ozark Mountains and other low divides through central Missouri , Kansas and Colorado separate the Missouri watershed from those of the White River and Arkansas River , also tributaries of the Mississippi River . 
 To the north , the much lower Laurentian Divide <a href='uninflect' title='1'><mark>separates</mark></a> the Missouri River watershed from those of the Oldman River , a tributary of the South Saskatchewan River , as well as the Souris , Sheyenne , and smaller tributaries of the Red River of the North . All of these streams <a href='drop_aux' title='2'><mark>are</mark></a>part of Canada <a href='null_genetive' title='3'><mark>'s</mark></a>Nelson River drainage basin , which empties into Hudson Bay . <a href='dey_it' title='4'><mark>There</mark></a> are also several large endorheic basins between the Missouri and Nelson watersheds in southern Alberta and Saskatchewan . The Minnesota and Des Moines Rivers , tributaries of the upper Mississippi , drain most of the area bordering the eastern side of the Missouri River basin . Finally , on the south , the Ozark Mountains and other low divides through central Missouri , Kansas and Colorado separate the Missouri watershed from those of the White River and Arkansas River , also tributaries of the Mississippi River . 
To da north , the much lower Laurentian Divide separate the Missouri River watershed from those of the Oldman River , a tributary of tdaSouth Saskatchewan River , as well as the Souris , Sheyenne , and smaller tributaries of the Red River of the North . alll of these streams part of Canada  Nelson River drainage basin , which empties into Hudson Bay . It is also several bigass endorheic basins between thdaissouri and Nelson watersheds in southern Alberta and Saskatchewan . The Minnesota and Des Moines Rivers , tributaries of the upper Mississippi , drain most of the area bordering thedastern side of the Missouri River basin . Finally , on the south , the Ozark Mountains and other low divides through central Missouri , Kansas and Colorado separate the Missouri watershed from those of the date River and Arkansas River , also tributaries of the Mdaissippi River .