The Pumphouse River Run on the Colorado River is a popular destination for whitewater enthusiasts. This stretch of water features several challenging rapids, including Yarmony Rapid, Eye of the Needle, and Pinball. The river run is considered to be of moderate difficulty, requiring some previous whitewater experience. The best time to float this section of water is during the spring and early summer, when water levels are high. The recommended flow rate for this river run is between 1,500 and 2,500 cfs. Overall, the Pumphouse River Run is an exciting and challenging adventure for experienced rafters and kayakers.