The Colorado River below Glen Canyon Dam flows through the lower reaches of Glen Canyon on its way to Lees Ferry , forming one of the most studied and discussed stretches of river in the American Southwest. Released from the base of the dam, the water is typically clear and tightly controlled. In recent years, however, lower water levels in Lake Powell have caused releases to come from shallower depths, warming the river compared to past decades and changing the conditions downstream. This reach is calm and approachable, making it a popular destination for kayaking, rafting, fishing, and flatwater exploration. Visitors often take time to linger along the banks, explore side canyons, and pull over at small beaches and alcoves—experiencing the river at an unhurried pace that encourages observation and learning. Quick facts about this stretch of river naturally help frame why it matters:
The Dirty Devil River joins the Colorado River at River Mile 169.5. John Wesley Powell camped at this confluence on July 28, 1869, describing the tributary as extremely muddy and foul-smelling. Jack Sumner later named it the Dirty Devil. The Dirty Devil is formed by the confluence of Muddy Creek and the Fremont River near present-day Hanksville, Utah. The Fremont River originates at Fish Lake and flows along the Waterpocket Fold through Capitol Reef National Park. Muddy Creek drains the San Rafael Swell. Historic Context — Powell’s Expeditions: Powell’s 1869 expedition recorded the Dirty Devil as both a geographic reference and a warning. In his later expeditions of 1871–72, Powell returned with improved boats and a scientific mandate. Tributaries such as the Dirty Devil became fixed reference points for mapping and geologic observation. Powell’s journals note the heavy silt load and poor water quality here, and his party avoided using the Dirty Devil as a water source when possible.
Camping and Dining
