PILGRIM CREEK. Pilgrim Creek rises (at 34°46' N, 101°12' W) in southern Armstrong County and runs southwest for four miles to its mouth (at 34°43' N, 101°16' W) on the Prairie Dog Town Fork of the Red River in northern Briscoe County. It traverses terrain of moderately steep slopes with locally high relief. The soil is made up of shallow to moderately deep silt loams, and the vegetation consists primarily of grasses and mesquite. The creek flows through the JA Ranch holdings.