Colo. Rev. Stat. § 33-32-101
The general assembly declares that it is the policy of this state to promote and encourage residents and nonresidents alike to participate in the enjoyment and use of the rivers of this state and, to that end, in the exercise of the police powers of this state for the purpose of safeguarding the health, safety, welfare, and freedom from injury or danger of such residents and nonresidents, to license and regulate those persons who provide river-running services in the nature of equipment or personal services to such residents and nonresidents for the purpose of floating on rivers in this state unless the provider of such river-running services is providing such river-running services exclusively for family or friends. It is not the intent of the general assembly to interfere in any way with private land owner rights along rivers or to prevent the owners of whitewater equipment from using said equipment to accommodate friends when no consideration is involved; nor is it the intent of the general assembly to interfere in any way with the general public's ability to enjoy the recreational value of state rivers when the services of river outfitters are not utilized or to interfere with the right of the United States to manage public lands and waters under its control. The general assembly recognizes that river outfitters, as an established business on rivers flowing within and without this state, make a significant contribution to the economy of this state and that the number of residents and nonresidents who are participating in river-running is steadily increasing.
C.R.S. § 33-32-101