 The Missouri 's largest tributaries by runoff are the Yellowstone in Montana and Wyoming , the Platte in Wyoming , Colorado , and Nebraska , and the Kansas – Republican / Smoky Hill and Osage in Kansas and Missouri . Each of these tributaries drains an area greater than 50 @,@ 000 square miles ( 130 @,@ 000 km2 ) , and has an average discharge greater than 5 @,@ 000 cu ft / s ( 140 m3 / s ) . The Yellowstone River has the highest discharge , even though the Platte is longer and drains a larger area . In fact , the Yellowstone 's flow is about 13 @,@ 800 cu ft / s ( 390 m3 / s ) – accounting for sixteen percent of total runoff in the Missouri basin and nearly double that of the Platte . On the other end of the scale is the tiny Roe River in Montana , which at 201 feet ( 61 m ) long is one the world 's shortest rivers . 
 The Missouri <a href='null_genetive' title='1'><mark>'s</mark></a>largest tributaries by runoff <a href='drop_aux' title='2'><mark>are</mark></a>the Yellowstone in Montana and Wyoming , the Platte in Wyoming , Colorado , and Nebraska , and the Kansas – Republican / Smoky Hill and Osage in Kansas and Missouri . Each of these tributaries <a href='uninflect' title='3'><mark>drains</mark></a> an area greater than 50 @,@ 000 square miles ( 130 @,@ 000 km2 ) , and <a href='got' title='4'><mark>has</mark></a> an average discharge greater than 5 @,@ 000 cu ft / s ( 140 m3 / s ) . The Yellowstone River <a href='got' title='5'><mark>has</mark></a> the highest discharge , even though the Platte <a href='drop_aux' title='6'><mark>is</mark></a>longer and <a href='uninflect' title='7'><mark>drains</mark></a> a larger area . In fact , the Yellowstone <a href='null_genetive' title='8'><mark>'s</mark></a>flow <a href='drop_aux' title='9'><mark>is</mark></a>about 13 @,@ 800 cu ft / s ( 390 m3 / s ) – accounting for sixteen percent of total runoff in the Missouri basin and nearly double that of the Platte . On the other end of the scale is the tiny Roe River in Montana , which at 201 feet ( 61 m ) long is one the world <a href='null_genetive' title='10'><mark>'s</mark></a>shortest rivers . 
Da Missouri  largest tributaries by runoff the Yellowstone in Montana and Wyoming , tdaPlatte in Wyoming , Colorado , and Nebraska , and the Kansas – Republican / Smoky Hill and Osage in Kansas and Missouri . Each of these tributaries drain an area greater than 50 @,@ 000 square miles ( 130 @,@ 000 km2 ) , and got an average discharge greater den 5 @,@ 000 cu ft / s ( 140 m3 / s ) . The Yellowstone River got the highest discharge , even doe the Platte longer and drain a larger area . In fact , thdaellowstone  flow about 13 @,@ 800 cu ft / s ( 390 m3 / s ) – accounting fa sixteen percent of total runoff in thedassouri basin and nearly double that of the datte . On the other end of the scale is the tda Roe River in Montana , which at 201 feet ( 61 m ) long is one the world  shortest rivers .