“…Some of the watershed drains to the Teton River. Tributary streams of lesser importance are Marsh Creek, which empties into the Portneuf River near McCammon, and Willow Creek, a tributary of the Snake River. i Much of the information on the subarea is taken from Stearns, Crandall, and Steward (1938), Mansfield (1920,1927), and West (1956 Precipitation ranges from an average of 10 inches at lower altitudes near the Snake Eiver Plain and in some of the upper drainage areas of the Portneuf River to more than 20 inches on the higl Q-r mountains (pi. 2).…”