Osage River Map of the Osage River watershed showing the Niangua River
Country United States State Missouri Kansas Region Osage Plains , Ozarks City Warsaw , Lake Ozark , Tuscumbia Source confluence - location Vernon County, Missouri - coordinates 38°01′39″N 94°14′39″W / 38.02750°N 94.24417°W / 38.02750; -94.24417 - elevation 722 ft (220 m)
Mouth Missouri River - location Bonnots Mill, Missouri - coordinates 38°35′49″N 91°56′43″W / 38.59694°N 91.94528°W / 38.59694; -91.94528 [ 1] - elevation 518 ft (158 m) Length 276 mi (444 km) Basin size 15,300 sq mi (40,000 km2 ) Discharge - location near St. Thomas, MO - average 10,879 cu ft/s (308.1 m3 /s) - minimum 640 cu ft/s (18 m3 /s) - maximum 216,000 cu ft/s (6,100 m3 /s)
Tributaries - left Marais des Cygnes River , South Grand River - right Little Osage River , Clear Creek , Sac River ,Pomme de Terre River , Niangua River Watersheds Osage-Missouri -Mississippi
The Osage River is a 276-mile-long (444 km)[ 2] tributary of the Missouri River in central Missouri in the United States . It is the 8th longest river in Missouri. It is named after the Osage Nation , a Native American tribe.[ 3]
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