Certainly the West's most famous river is the Colorado. The Colorado comes alive high up along the Continental Divide and begins it's 1,440 mile journey through 3 states before ending at the Gulf of Califonia. Gore Canyon Class V Considered one of the TOP 3 Most Difficult commercial runs in the United States. (Season is August to September) Full Day Lunch Adult: $ 128.00 (18 minimum age) Previous Class V experience is a must. Guests are swim tested and taught special safety skills before entering the canyon.