The
Grand River is a tributary of the
Missouri RiverThe Missouri River is a tributary of the Mississippi River, and is the longest river in the United States of America. The Missouri likely originates at Brower's Spring at the upper reaches of the Jefferson, before joining the confluence of the Madison, Jefferson, and Gallatin rivers in Montana....
in
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America; on the Canadian border halfway between the Pacific and Atlantic oceans. North Dakota is the 19th largest state by area in the U.S.; it is the 3
rd least populous, with just over 641,481 residents as...
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States of America. It is named after the Lakota and Dakota Sioux American Indian tribes. South Dakota was carved out of the southern half of the Dakota Territory and admitted to the Union on November 2, 1889...
in the
United StatesThe United States of America is a federal constitutional republic comprising fifty states and a federal district...
. The length of the combined branch is 110 mi (177 km). With its longest fork, its length is approximately 200 mi (320 km).
It is formed by the confluence of the
North ForkThe North Fork of the Grand River is a tributary of the Grand River, approximately 80 mi long, in North Dakota and South Dakota in the United States....
(which rises in North Dakota) and the longer
South ForkThe South Fork of the Grand River is a tributary of the Grand River, approximately 90 mi long, in South Dakota in the United States.It rises in the Badlands of northwestern South Dakota, south of the Cave Hills in western Harding County, and flows east past Buffalo, then past several units of the...
(which rises in South Dakota) in northwestern South Dakota near Shadehill in
Perkins CountyPerkins County is a county located in the U.S. state of South Dakota. As of 2000, the population was 3,363. Its county seat is Bison. It is, in area, the second largest county in South Dakota, its size being exceeded only by Meade County.-Geography:...
, near several parcels of the
Grand River National GrasslandGrand River National Grassland is a National Grassland in northwestern South Dakota, USA. It is named for the Grand River. The North and South forks of the rivers meet in the grassland. It has a land area of 154,783 acres . In descending order of acreage it lies in parts of Perkins, Corson, and...
.
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The
Grand River is a tributary of the
Missouri RiverThe Missouri River is a tributary of the Mississippi River, and is the longest river in the United States of America. The Missouri likely originates at Brower's Spring at the upper reaches of the Jefferson, before joining the confluence of the Madison, Jefferson, and Gallatin rivers in Montana....
in
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America; on the Canadian border halfway between the Pacific and Atlantic oceans. North Dakota is the 19th largest state by area in the U.S.; it is the 3
rd least populous, with just over 641,481 residents as...
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States of America. It is named after the Lakota and Dakota Sioux American Indian tribes. South Dakota was carved out of the southern half of the Dakota Territory and admitted to the Union on November 2, 1889...
in the
United StatesThe United States of America is a federal constitutional republic comprising fifty states and a federal district...
. The length of the combined branch is 110 mi (177 km). With its longest fork, its length is approximately 200 mi (320 km).
It is formed by the confluence of the
North ForkThe North Fork of the Grand River is a tributary of the Grand River, approximately 80 mi long, in North Dakota and South Dakota in the United States....
(which rises in North Dakota) and the longer
South ForkThe South Fork of the Grand River is a tributary of the Grand River, approximately 90 mi long, in South Dakota in the United States.It rises in the Badlands of northwestern South Dakota, south of the Cave Hills in western Harding County, and flows east past Buffalo, then past several units of the...
(which rises in South Dakota) in northwestern South Dakota near Shadehill in
Perkins CountyPerkins County is a county located in the U.S. state of South Dakota. As of 2000, the population was 3,363. Its county seat is Bison. It is, in area, the second largest county in South Dakota, its size being exceeded only by Meade County.-Geography:...
, near several parcels of the
Grand River National GrasslandGrand River National Grassland is a National Grassland in northwestern South Dakota, USA. It is named for the Grand River. The North and South forks of the rivers meet in the grassland. It has a land area of 154,783 acres . In descending order of acreage it lies in parts of Perkins, Corson, and...
. It flows east, through the
Standing Rock Indian ReservationThe Standing Rock Indian Reservation is a Lakota and Dakota Indian reservation in North Dakota and South Dakota in the United States. It is the sixth-largest reservation in land area in the United States and comprises all of Sioux County, North Dakota, and all of Corson County, South Dakota, plus...
and joins the Missouri in Lake Oahe, approximately 10 mi (16 km) northwest of
MobridgeMobridge is a city in Walworth County, South Dakota, United States. The population was 3,574 at the 2000 census.-Geography:Mobridge is located at ....
. The lower 15 mi (25 km) of the river form an arm of the Lake Oahe reservoir.
The forks of the Grand was the site of the famous 1823 attack by a
grizzly bearThe brown bear is a large bear distributed across much of northern Eurasia and North America. It weighs 100 to 680 kilograms and its largest subspecies, the Kodiak Bear, rivals the polar bear as the largest member of the bear family, and as the largest land based predator.While the brown...
on frontiersman
Hugh GlassHugh Glass was an American fur trapper and frontiersman noted for his exploits in the American West during the first third of 19th century. He was nearly killed by a grizzly bear, and was killed by Native Americans ten years later....
.