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The exposure grade describes the potential consequences of falling or slipping off the path.
Low Exposure: The path is on completely flat land and potential injury is limited to falling over.
Medium Exposure: The trail contains some obstacles such as outcroppings and rock which could cause injury.
High Exposure: Some trail sections have exposed ledges or steep ascents/descents where falling could cause serious injury.
Extreme Exposure: Some trail sections are extremely exposed where falling will almost certainly result in serious injury or death.
Starting from the mouth of Waterton Canyon (35 miles southwest of downtown Denver) and going through to Durango on the southern border of Colorado, this long and high elevation trail is an unforgettable adventure.
Its highest point is 13,271 feet (4,045 m) above sea level, and most of the trail is above 10,000 feet (3,000 metres) but despite this, the trail often drops into forests and valleys, giving you a break from inhospitable high mountain terrain.
The trail is for non-motorised transport only and passes through eight mountain ranges, six National Forests, and six wilderness areas; it is wonderfully peaceful.
Its lowest point is in Denver at 5,500 feet (1,700 metres) and it reaches 13,271 feet (4,045 metres) in the San Juan Mountains.
In between is everything from quiet forests and valleys to high mountain passes and old Indian settlements.
The trail dips in and out of civilisation so it is logistically easy to manage but it does frequently require long sections of wild camping; the second half of trail is especially wild as it passes through and around the peaks of the San Juan Mountains.
Whether you do it in a "oner" or break it up, you will climb and descend 89,000 feet (27100 metres) on this trail and see some of the finest parts of North America.