The second Indian Agency on the Blackfeet Reservation was built in 1879 at Old Agency, at the bend in the Flathead River. Agent John Young moved the buildings from Upper Badger Creek with help from the Blackfeet Indians. Both men and women dug cellars, hauled stone and mixed mortar. The women covered the exterior with lime from Heart Butte. The Indians called it "Old Ration Place" after the government began issuing rations.

The "Starvation Winter" of 1883-1884 took the lives of about 500 Blackfeet Indians who had been camping in the vicinity of Old Agency, the result of an inadequate supply of government rations during an exceptionally hard winter.

In 1894, after the Great Northern Railway had extended its tracks across the Reservation, the Agency moved to Willow Creek at the present site in Browning.

http://photos.historical-markers.org/Montana/Glacier-County/MT-007-Old-…

The Flathead River originates in the Canadian Rockies to the north of Glacier National Park and flows southwest into Flathead Lake, then after a journey of 158 miles, empties into the Clark Fork. The river is part of the Columbia River drainage basin, as the Clark Fork is a tributary of the Pend Oreille River, a Columbia River tributary. With a drainage basin extending over 8,795 square miles and an average discharge of 11,380 cubic feet per second, the Flathead is the largest tributary of the Clark Fork and constitutes over half of its flow.
https://en.wikipedia.org/wiki/Flathead_River

Wild Horse Plains:
Wild Horse Plains is nestled in a circular valley at an elevation of 2,450 ft., drained by the Clark Fork River.