Colorado River

About

Colorado River, Utah — 1776 Dominguez Escalante, 1840s-1880s Mining, 2010s Colorado River Trail 140-mi Moab. The gauge tells the first story. Streamgage 09180500 anchors the Utah reach with a long-run average near 6,939 cfs, and boaters watch the optimal window of 3,450 to 10,400 cfs. Within that range the river shifts character section by section: the committing rapids of Westwater Canyon, the mellower drift from Cisco to Dewey Bridge, the popular Moab Daily, and the long flatwater push from Potash to the Green River confluence. The overall rating is Class II+, with individual drops climbing to Class IV.

The human record here runs deep. The Ute, Paiute, and Navajo (Diné) peoples held this country as ancestral homeland, and the river's very name records the red silt it drew from the Colorado Plateau. Recorded European history arrived in 1776, when the Dominguez-Escalante Expedition — led by Franciscan priests Atanasio Dominguez and Silvestre Velez de Escalante — explored the region and carried the Spanish flag into the interior of Utah, Colorado, and Arizona. Nearly a century later, in the summer of 1869, Major John Wesley Powell pushed off into the unknown, leading the first thorough exploration of the river and the Grand Canyon it had spent eons carving.

Contrary to the timber-rich Uinta Basin to the north, the canyon corridor through Grand and San Juan counties was never a real logging district — the land flanking the river is desert. What sawmilling supported the region drew instead on the forested La Sal Mountains rising east of Moab. Mormon settlers established the Elk Mountain Mission at present-day Moab in 1855, valuing the site partly for its water and timber, and after mineral strikes in the La Sals in 1892, cattle and timber proved more durable than mining. Overcutting and grazing prompted federal protection: President Theodore Roosevelt created the La Sal Forest Reserve on January 25, 1906, from 158,462 acres straddling Utah and Colorado, and it became the La Sal National Forest on March 4, 1907. Erosion and flooding around Moab peaked between 1918 and 1920. The forest was folded into the Manti National Forest in 1949 and renamed the Manti-La Sal National Forest in 1958, which still administers the timbered high country above the river today.

As settlement and irrigation downstream intensified, the demands on the river's flow grew contentious. On November 24, 1922, the Colorado River Compact was signed, drawing the line between the Upper and Lower Basin states and dividing the water so many had come to depend upon. The river's modern transformation arrived in 1935, when the completion of Hoover Dam impounded Lake Mead, still the largest reservoir in the United States. Upstream, Lake Powell — the largest reservoir in the upper Colorado River basin — sat at 32 percent of capacity in 2024, down from 96 percent in 2000.

Management, not wilderness, defines the river now. The Bureau of Land Management oversees the corridor, and in 2024 the Colorado River Basin Restoration Program — a joint Utah Division of Water Resources, Colorado River Board of Utah, and Bureau of Reclamation effort — removed nine fish-passage barriers and restored 32 miles of riparian buffer. That year the Utah reach recorded 248,000 paddling user-days, up 31 percent from 2018, and it still supports one of the densest populations of endangered Colorado pikeminnow (Ptychocheilus lucius) and razorback sucker (Xyrauchen texanus) in the upper basin. From Spanish friars to compacts and dams, the Colorado remains a working river.