Grand River (Michigan)
| Grand River | |
|---|---|
A map of the Grand River
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| Basin features | |
| Main source |
Somerset Township, Hillsdale County, Michigan 42°05′12″N 84°25′21″W / 42.0867°N 84.42245°W |
| River mouth |
Grand Haven, Michigan 43°03′30″N 86°15′03″W / 43.05835°N 86.25088°WCoordinates: 43°03′30″N 86°15′03″W / 43.05835°N 86.25088°W |
| Basin size | Grand River Watershed |
| Physical characteristics | |
| Length | 252 miles (406 km) |
| Discharge |
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The Grand River is the longest river in the U.S. state of Michigan. It runs 252 miles (406 km) through the cities of Jackson, Eaton Rapids, Lansing, Grand Ledge, Portland, Ionia, Lowell, Grand Rapids, and Grand Haven. Native Americans who lived along the river before the arrival of the French and British called the river O-wash-ta-nong, meaning Far-away-water, because of its length.
As the glacial ice receded from what is the central Lower Peninsula of Michigan around 11,000 years ago, the Maple River and lower Grand River served as a drainage channel for the meltwater. The channel ran east to west, emptying into proglacial Lake Chicago, the ancestor of Lake Michigan. Today the Grand River rises in Somerset Township in Hillsdale County and Liberty Township in Jackson County, and flows through Jackson, Ingham, Eaton, Clinton, Ionia, Kent, and Ottawa counties before emptying into Lake Michigan. Its watershed drains an area of 5,572 square miles (14,430 km2), including 18 counties and 158 townships. Tributaries of the river include (beginning near river source and travelling downstream): Portage River, Red Cedar River, Looking Glass River, Maple River, Bellamy Creek, Flat River, Thornapple River, Rogue River, Coldbrook Creek, Plaster Creek, Bass River, and Crockery Creek. The Grand River carries an average 3,800 ft³/s (108 m³/s). It has several dams along its length but is a trout and salmon stream for much of its length. It is estimated that 22% of the pesticide usage in the Lake Michigan watershed occurs in the Grand River drainage, which accounts for only 13% of the lake's total watershed. Much of the basin is flat, and it contains many swamps and lakes.
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