Great Miami River
| Great Miami River | ||
 Catchment area of the Great Miami River (beige) to the west. To the east of the Little Miami River (catchment area shown in yellow) |
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| Data | ||
| Water code | US : 1077579 | |
| location | Ohio (USA) | |
| River system | Mississippi River | |
| Drain over | Ohio River → Mississippi River → Gulf of Mexico | |
| origin |
Indian Lake 40 ° 28 ′ 4 " N , 83 ° 52 ′ 33" W. |
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| Source height | 304 m | |
| muzzle |
Ohio River Coordinates: 39 ° 6 ′ 31 " N , 84 ° 48 ′ 52" W 39 ° 6 ′ 31 " N , 84 ° 48 ′ 52" W. |
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| Mouth height | 137 m | |
| Height difference | 167 m | |
| Bottom slope | 0.65 ‰ | |
| length | 257 km | |
| Catchment area | 13,915 km² | |
| Drain |
MQ |
152 m³ / s |
| Right tributaries | Whitewater River | |
| Big cities | Dayton | |
| Medium-sized cities | Sidney , Piqua , Troy , Middletown , Hamilton | |
 Great Miami River at Vandalia |
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The Great Miami River (also called Miami River ) is a right tributary of the Ohio River , approximately 257 km long, in southwest Ohio ( USA ).
It was named after the Miami tribe who lived here until the land was taken by white settlers. The region around the Great Miami River is known as the Miami Valley .
The river begins at Indian Lake in Logan County , approximately 15 miles southwest of Lima . It flows south and southwest to Sidney in Loramie Creek in northern Miami County . It then flows south to Piqua and Troy , through Dayton , where it joins the Stillwater River , Mad River and Wolf Creek . From Dayton it flows southwest to Middletown and Hamilton in southwest Ohio. In Hamilton County it flows with the Whitewater River about 8 km from its confluence with the Ohio, about 15 miles west of Cincinnati .
The Miami and Erie Canal was built in the 1830s and connects it to Lake Erie and served as the main transportation route in western Ohio until the 1850s.
After a major flood in March 1913 ( Great Dayton Flood ), the Miami Conservancy District was established in 1914 to regulate and control the course of the river.
