 By the 1920s, however, the coal industry in Pleasant Valley was clearly in decline and most mines ceased operation causing the town to lose nearly all its residents.The town of Scofield lies in the bituminous coal field of Carbon County, Utah, about from the main line of the Rio Grande Western Railroad, and is nestled among the hills that surround the upper part of Pleasant Valley.The town is situated along Mud Creek, just south (upstream) of the Scofield Reservoir.