I would say 99 feet. An elevation of 20 feet above the ground is the starting point. Then as the coaster rises 83 feet, you add 20 + 83 = 103 feet. Then it drops 42 feet. 103 - 42 = 61 feet. Then it rises 128 feet on the second hill. 61 + 128 = 189 feet. Finally, it drops 90 feet. 189 - 90 = 99 feet above the ground after the second hill.