The Tunnel 1 to Golden Whitewater Park river run in Colorado is a fun and challenging Class III-IV stretch of water. The obstacles on this section include the Entrance Rapid, the Castle Rock Rapid, and Supermax Rapid, which all require precise maneuvering. The best time to float this section is during the late spring and early summer, when water levels range from 700-1,200 CFS. Floaters should be experienced and have proper gear, as the rapids are technical and require good control.

Weather today, A chance of showers before 4pm, then a chance of showers and thunderstorms between 4pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 65. Breezy, with a west wind 10 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 70%.