About
Colorado River Pumphouse, Grand County — 1967 Windy Gap, 1985 Williams Fork, 11,000-Year-Old Sites. Through Grand County's Middle Park, the Upper Colorado runs 30 miles of Class II-III water that forms the backbone of Colorado's commercial rafting industry. The Pumphouse to Radium section delivers five miles of classic Class II-III drops — the day trip that most outfitters like Kremmling Rafting Co. focus on. Below Radium, the river mellows through ranching country to Rancho del Rio, then finishes with Class I-II water to State Bridge. At 1,450 CFS average, the Upper Colorado holds its character across a wide range — optimal flows run 800-2,500 CFS on USGS gauge 09058000. The BLM manages this stretch as the Upper Colorado River Special Recreation Management Area under a 2013 plan that coordinates the heavy commercial use. The Ute people called Middle Park home for generations before European contact, and the river corridor still shows that high-elevation ranch and sagebrush landscape that drew them to winter here.
River conditions are community-verified. CFS ranges, difficulty ratings, and access points may not reflect every flow level or seasonal change. Always check current conditions, scout unfamiliar rapids, and paddle within your skill level.