The Lower Fish Creek River Run in Colorado is a Class III-IV river run that is approximately 4.5 miles long. The best time of year to float this section of water is during the spring and early summer when the water levels are high, typically around 1,000-2,000 cfs. The river features a variety of obstacles, including large boulders, tight turns, and several Class IV rapids. This section of the river requires advanced kayaking and rafting skills, and should only be attempted by experienced paddlers. Overall, the Lower Fish Creek River Run is a challenging and exciting adventure for whitewater enthusiasts.