South Fork Grand River (South Dakota)

The South Fork of the Grand River is a tributary of the Grand River, approximately 90 mi (145 km) long, in South Dakota in the United States.

South Fork Grand River Tributary to Grand River
Location of South Fork Grand River mouth Show map of South Dakota South Fork Grand River (South Dakota) (the United States) Show map of the United States
Location
Country	United States
State	South Dakota
Counties	Perkins Harding
Physical characteristics
Source	Buffalo Creek divide
• location	about 12 miles southwest of Buffalo, South Dakota
• coordinates	45°27′14.98″N 103°43′1.72″W[1]
• elevation	3,500 ft (1,100 m)[1]
Mouth	Grand River
• location	Shadehill Reservoir
• coordinates	45°43′29.98″N 102°17′1.57″W[1]
• elevation	2,274 ft (693 m)[1]
Length	143.15 mi (230.38 km)[2]
Basin size	2,283.21 square miles (5,913.5 km2)[3]
Discharge
• location	Grand River
• average	115.36 cu ft/s (3.267 m3/s) at mouth with Grand River[3]
Basin features
Progression	Grand River → Missouri River → Mississippi River → Gulf of Mexico
River system	Grand River
Tributaries
• left	Big Creek, Little Grand River, Jerry Creek, Pine Spring Creek, Graves Creek, Brush Creek, Rush Creek, Slick Creek, Sheep Creek, Boxelder Creek, Jones Creek, Bull Creek, Coal Creek, Horse Creek, Brush Creek, Skull Creek, Olean Creek, Middle Creek, Big Nasty Creek, Duck Creek, Little Nasty Creek, Lodgepole Creek
• right	Clarks Fork Creek, Eggland Creek, Prairie Dog Creek, Fisher Creek, Bar H Creek, White Hill Creek, Murphy Creek, Snake Creek, Defenbull Creek, Timber Draw Creek, Box Spring Creek, Butcher Creek
Bridges	Gilbert-Hett Road, US 85, E6 Road (x2), SD 79, White Hill Road, Divide Road, SD 75, White Butte Road

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 Grand River National Grassland in northern Perkins County. It joins the North Fork in the Shadehill Reservoir near to form the Grand, which is a tributary of the Missouri.