Bear Creek, a small 2nd order tributary to the lower Blackfoot River, flows 6 miles north to its mouth where it enters the Blackfoot River at river mile 12.2 with a base-flow of 3-5 cfs. Its headwaters drain the east and southeastern slopes of Olsen Mountain in the Garnet Mountain range with stream gradients ranging from 460ft/mile in the upper reaches to 135ft/mile in the lower mile of stream. In 2010, all former Plum Creek Timber Company land in the Bear Creek drainage was transferred to DNRC. Bear Creek is one of the colder tributaries to the lower Blackfoot River.