The Lower Brule Indian Reservation was originally located southwest of present day
 Oacomacovering the rolling hills and flatlands above what Lyman Countians know
 today as the Dude Ranch area. An Indian agency issue house was established on the
 reservation by the Federal Government.

 A treaty was signed by the chiefs and governmental officials in March of 1879 when
 the land was opened for homesteading and the reservation was moved north of
 Oacoma to along the banks of the Missouri River.

 The reservation, originally 472,550 acres, was moved back in the 1960s when the
 Missouri River was dammed and the area was flooded. The reservation’s industry is
 their 4,200 acre farm in the Big Bend area where they have grown and marketed
 popcorn, kidney, pinto and navy beans since the late 80s, as well as their casino
 which has been in operation since the mid 1990s. Buffalo and elk roam the hills to the
 delight of their tourists and hunters from across the nation. In late 1999, Lower Brule
 hooked up to rural water.