Bishop River Provincial Park is a provincial park in the Pacific Ranges of the Coast Mountains on the Mainland of British Columbia, Canada, located southwest of and adjoining Ts'yl-os Provincial Park."Bishop River Park". BC Geographical Names.  It lies along the upper course of the Bishop River, the main tributary of the Southgate River, from the Bishop's source at the western side of the Lillooet Icecap to midway along its course above its confluence with the Southgate. The park is 19,947 ha. in size.