For high adventure lovers, this is an adventure that will tax even the most skilled and experienced. Travelling up the length of Lake Mead to the mouth of the Colorado River, you’ll be fighting current in many spots along the way, particularly as you get closer to the river mouth. Almost 57 miles one-way, this is a grueling but rewarding adventure. Finish your trek at the South Bay, AZ boat ramp, right near the river mouth on the east side of the river.