Colorado River: The Architect of the Grand Canyon

The River at the Bottom

The Colorado River flows at the base of the Grand Canyon, having carved this iconic landscape over the past 5–6 million years (though the canyon's rock layers record nearly 2 billion years of geological history).

Key Dimensions

• Length through canyon: 277 river miles (446 km)
• Canyon width: Up to 18 miles (29 km)
• Maximum depth: >1 mile (6,000 ft / 1,800 m)
• Elevation drop: ~2,000 ft (610 m) from Lee's Ferry to Grand Wash Cliffs

Hydrology & Management

The river is heavily regulated by Glen Canyon Dam (Lake Powell) upstream and Hoover Dam (Lake Mead) downstream. Flow regimes now prioritize water delivery, hydropower, and ecosystem management (e.g., controlled floods to rebuild sandbars).

Visitor Experience

• Rafting trips: 3–18 days, motorized or oar-powered
• Phantom Ranch: Only lodging at river level (lottery reservation)
• Trails: Bright Angel, South Kaibab, North Kaibab descend to river
• Scenic views: From rims (South Rim Village, Desert View, North Rim)