Little Miami River

Little Miami National Scenic River
Little Miami River at Milford, Ohio
Country	United States
Basin
Main source	1,151 ft (351 m) 39°49′39″N 83°34′36″W / 39.82750°N 83.57667°W / 39.82750; -83.57667 (Little Miami River source) S of Plattsburgh Clark County, Ohio
River mouth	446 ft (136 m) 39°04′41″N 84°25′59″W / 39.07806°N 84.43306°W / 39.07806; -84.43306 (Little Miami River mouth)Coordinates: 39°04′41″N 84°25′59″W / 39.07806°N 84.43306°W / 39.07806; -84.43306 (Little Miami River mouth) with the Ohio River at California, Cincinnati Hamilton County, Ohio
Basin size	1,757 sq mi (4,550 km2)
Physical characteristics
Length	111 mi (179 km)
Discharge	Average rate: 1,280 cu ft/s (36 m3/s)

The Little Miami River (Shawnee: Cakimiyamithiipi) is a Class I tributary of the Ohio River that flows 111 miles (179 km) through five counties in southwestern Ohio in the United States. The Little Miami joins the Ohio River east of Cincinnati. It forms parts of the borders between Hamilton and Clermont counties and between Hamilton and Warren counties. The Little Miami River is one of 156 American rivers designated by the U.S. Congress or the Secretary of the Interior as a National Wild and Scenic River and lends its name to the adjacent Little Miami Scenic Trail.

The Little Miami River is a tributary of the Ohio River. It is part of a watershed that drains a 1,757 square miles (4,550 km²) area in 11 southwestern Ohio counties: Clark, Montgomery, Madison, Greene, Warren, Butler, Clinton, Clermont, Brown, and Highland. The river discharges on average 1,737 cubic feet per second (49.2 m³/s) into the Ohio River. An average of 1,280 cubic feet per second (36 m³/s) flow through the river proper; after heavy rains, the river flow may rise to 84,100 cubic feet per second (2,380 m³/s).