There are springs for a distance of about 8 km along the base of the steeper alluvial slope paralleling the Duck Creek Mountains on the east side of Steptoe Valley. The springs increase in temperature from north to south. Schoolhouse Spring at the north end of this zone, in the NW¼ SE¼ Sec. 3, Tl8N, R64E, had a temperature of 24.4°C and flow rate of 1,700 L/min on July 5, 1918 (Hardman and Miller, 1934).
The McGill Warm Springs at the south end of the zone range up to 29°C in temperature and flow 17,000 L/min (Clark and others, 1920). There are three main springs; a pool has been excavated at the largest. Several additional springs apparently are covered by tailings from the huge Kennecott Copper Corp. mill. The water has been used in the mill and in a municipal swimming pool (Eakin and others, 1967). Reed estimated the reservoir temperature to be 29ºC (Reed and others, 1982, p. 107).