Osage River

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Osage River
Map of the Osage River watershed showing the Niangua River
Location
Country	United States
State	Missouri Kansas
Region	Osage Plains, Ozarks
City	Warsaw, Lake Ozark, Tuscumbia, St. Thomas
Physical characteristics
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)
Basin features
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. The eighth-largest river in the state, it drains a mostly rural area of 15,300 square miles (40,000 km²). The watershed includes an area of east-central Kansas and a large portion of west-central and central Missouri, where it drains northwest areas of the Ozark Plateau.

The river flows generally easterly, then northeasterly for the final 80 miles (130 km) where it joins the Missouri River. It is impounded in two major locations. Most of the river has been converted into a chain of two reservoirs, the Harry S. Truman Reservoir and the Lake of the Ozarks.