The Colorado River starts high in Rocky Mountain National Park and flows 1,450 miles through Colorado, into Utah and Arizona before emptying in Northern Mexico at the Golf of California. The boundary between the Upper and Lower Colorado River is Lee Ferry, which is located 16 miles downstream of Glen Canyon.

The river is divided into the Upper and Lower Sections. The Lower Colorado River flows toward Glenwood Springs. Here you will come across Glenwood Canyon. Here, the river runs through breathtaking desert scenery. These rapids are intense, classified as III-IV whitewater. Shoshone run, Upper Superstition and Tombstone bring you under the sheer cliff walls of the Glenwood Canyon. During high spring waters, most outfitters have a 16-year-old age limit along this section of the river.

The International Rapid Rating Scale:

• Class I: Easy. Fast moving water with riffles, small waves.
• Class II: Novice. Straightforward rapids, wide, clear channels.
• Class III: Intermediate. Rapids, moderate, irregular waves.
• Class IV: Advanced. Intense, powerful rapids, precise boat
handling.
• Class V: Expert. Long, obstructed, violent rapids.