Whitewater raft through browns canyon national monument on the arkansas river in colorado this section is perfect for beginner and experienced boaters alike ages 7 and up bring the whole family and experience over 12 class iii rapids on our 12 day trip surrounded by breathtaking views of browns canyon national monument browns canyon is the most popular rafting destination in the country and once you experience it you will know why it is so popular enjoy great whitewater beautiful scener