Colorado River — Glenwood Canyon

About

Glenwood Canyon, Colorado — 1903 Shoshone Power Plant, 1992 I-70 Final Link, Hanging Lake. Before the hydroelectric plant, before the railroad, Glenwood Canyon was Ute territory. The hot springs at the gorge's downstream end — the natural feature that would later anchor a Victorian resort town — were a revered Ute gathering site. 'Glenwood' is a settler name applied to a place the Ute knew long before European contact. On the canyon walls, pictographs from Fremont culture people record an earlier human presence, still visible today to travelers who know where to look along the gorge's towering faces.

European settlement of the lower canyon coalesced around those same hot springs, which developed into a Victorian resort built on the sulfur waters. The Colorado Midland Railroad reached Glenwood Springs in 1887, opening the gorge to tourist traffic and reframing the canyon as a corridor rather than an obstacle. Doc Holliday died in the town that same year, and President Theodore Roosevelt hunted nearby in 1905. The canyon's industrial era began more quietly in 1903 with the Shoshone Power Plant, a run-of-river hydroelectric facility six miles east of Glenwood Springs on the Colorado River. The Shoshone plant still operates, ranks among the earliest intact hydroelectric stations on Colorado's Western Slope, and is listed on the National Register of Historic Places.

The transformation that most visibly remade the canyon took twelve years of construction and set the record for the most expensive per-mile federal highway project in American history. Completing Interstate 70's final link required 40 bridges and 3 tunnels routed along the river corridor. Crews finished the project in 1992, and Colorado DOT documentation records that it won more than 30 design and environmental awards — an unusual accounting for highway construction, reflecting the challenge of threading a freeway through a gorge without erasing its natural character. The Glenwood Canyon Bike Path, a paved riverside trail, opened the same year, running in the shadow of the interstate through the length of the gorge.

The river's flow through the canyon is tracked by USGS gauge 09085000, which records an average discharge of about 6,800 cubic feet per second; the station sits below Glenwood Springs at an elevation of 5,705.42 feet above NAVD 1988. Optimal paddling conditions for the Class III–IV canyon run fall between 3,000 and 8,000 cfs. The 12.5-mile corridor divides into three practical sections: Dotsero to Grizzly Creek carries Class II–III water through the upper approach; the four miles from Grizzly Creek to Shoshone hold the heaviest whitewater at Class III–IV, the best of the run; and below the mandatory Shoshone Dam portage, the river runs Class III into Glenwood Springs.

The canyon's most photographed natural feature lies just off the water. Hanging Lake, a travertine-deposit lake reached by a 1.2-mile trail from I-70 Exit 125, suffered a major debris flow in 2020 from the Grizzly Creek Fire burn scar and has been progressively restored through 2025. Together the lake, the historic Shoshone plant, the interstate, and the riverside bike path make Glenwood Canyon a rare place where a working river and a century of human engineering share the same narrow walls.