In 1979, the park was sold to Six Flags and became known as Six Flags Magic Mountain. In 1981, Six Flags Magic Mountain introduced a ride that was on the west coast for the first time called Roaring Rapids. It was developed by Intamin in conjunction with the now defunct Six Flags Astroworld, which had opened a similar ride in 1979. Along with Rapids came the completion of the midway near Spillikin Corners to link with Revolution's area. Finally, a complete circuit could be made around the park. It was originally designed as a dual-sided station, but only one was fully developed, and all that exists of the possible second side is a few supports. It uses large pumps to circulate water, and each of the two pumps can circulate 88,500 gallons per minute. The reservoir can hold 1.5 million gallons of water, and one of the innovations used on it was the introduction of guide boards to help eliminate jam ups.