Great Miami River
|Great Miami River|
The Great Miami River near Vandalia
from Indian Lake,
Russells Point, Logan County, Ohio
|Mouth||Coordinates:  Ohio River
in Hamilton County, Ohio,
just East of the Indiana state line.
|Basin countries||United States of America|
|Length||160 miles (260 km)|
|Source elevation||998 ft (304 m)|
|Mouth elevation||449 feet (137 m)|
|Avg. discharge||5,368 ft³/s (152 m³/s)|
|Basin area||5,373 mi² (13,915 km²)|
The Great Miami River (also called the Miami River) (Shawnee: Msimiyamithiipi ) is a tributary of the Ohio River, approximately 160 miles (260 km) long, in southwestern Ohio in the United States. The Great Miami flows through Dayton, Piqua, Troy, Hamilton, and Sidney.
The region surrounding the Great Miami River is known as the Miami Valley. This term is used in the upper portions of the valley as a moniker for the economic-cultural region centered primarily on the Greater Dayton area. The lower portions of the Miami Valley fall under Cincinnati's economic and cultural influences and no not identify with the term in the same way.
The main course of the Great Miami River rises from the outflow of Indian Lake in Logan County, about 1 mile (1.6 km) southeast of the village of Russells Point, approximately 15 miles (24 km) southeast of Lima. Indian Lake is an artificial reservoir which receives the flow from the North and South forks of the Great Miami River. It flows south and southwest, past Sidney, and is joined by Loramie Creek in northern Miami County. It flows south past Piqua and Troy, and through Taylorsville Dam near Tipp City and Vandalia. It continues through Dayton, where it is joined by the Stillwater and the Mad rivers and Wolf Creek.
From Dayton it flows southwest past Miamisburg, Franklin, Middletown and Hamilton in the southwest corner of Ohio. In southwestern Hamilton County it is joined by the Whitewater River approximately 5 miles (8.0 km) upstream from its mouth on the Ohio River, just east of the Ohio-Indiana state line, approximately 16 miles (26 km) west of Cincinnati. The river meanders across the state line near Lawrenceburg, Indiana in the last two miles (3 km) before reaching its mouth approximately ¼ mile east of the border in Ohio.
Natural and human history 
The Miami and Erie Canal, which connected the Ohio River with Lake Erie, was built through the Great Miami watershed. The first portion of the canal, from Cincinnati to Middletown was operational in 1828, and extended to Dayton in 1830.  Water from the Great Miami fed into the canal. . A later extension to the canal, the Sidney Feeder, drew water from the upper reaches of the Great Miami from near Port Jefferson and Sidney. The canal served as the principal route of transportation for western Ohio until being supplanted by railroads in the 1850s. As was common in early industrial days, the river served as a source of water and a method to dispose of wastes for a variety of major industrial firms including Armco Steel, Champion International Paper, Black Clawson, Fernald and many others. Heightened attention to water pollution in the late 1950s and 1960s led to significant improvements.
Alternate Names 
The Great Miami River has also been known as:
- Assereniet River
- Big Miami River
- Gran Miammee Fiume
- Grande Miami Riviere
- Great Miama River
- Great Miamia River
- Great Miammee River
- Great Mineami River
- Miami River
- Riviere à la Roche
- Rocky Fiume
- Rocky River
- Big Mineamy River
- Great Miamis River
- Great Miyamis River
- Miamis River
- Riviere La Rushes
- Rockey River
|This section requires expansion. (June 2008)|
- U.S. Geological Survey Geographic Names Information System: Great Miami River
- "Shawnees Webpage". Shawnee's Reservation. 1997. Retrieved 2013-04-26.
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 19, 2011
- Arthur Benke & Colbert Cushing, Rivers of North America, Elsevier Academic Press, 2005 ISBN 0-12-088253-1