At approximately 2330 Mountain time, the airplane impacted electrical power lines about one mile north of the airport. The Private pilot and his passenger received fatal injuries; the aircraft was destroyed. Visual conditions prevailed. Witnesses reported the pilot landed at the airport earlier in the evening and, after visiting with people at the airport, departed for the airstrip at Green River, Utah. About 45 minutes later, the aircraft returned and, while on an extended final to Runway 18, hit the wires, which are strung between unlighted poles. The runway lights were not functioning and although Runway 36 is equipped with a VASI (Visual Approach Slope Indicator), Runway 18 is not.
