sentences:  As originally built, the line was 153.4 miles long, crossing the Continental Divide at Hagerman Pass (at altitude 12,055 feet), Fremont Pass (at altitude 11,346 feet) and Argentine Pass (at altitude 13,532 feet).For many years, this was the highest electric power transmission line in the world.The three-phase line operated at 90 kV and was supported 1400 steel towers 44 feet high on an average spacing of 730 feet.