C.R.S. § 24-51-308: City managers and key management staff.

Any municipality affiliated with the association may authorize the city manager and key management staff who report directly to the city council or city manager to make a one-time, irrevocable election to be exempted from membership. If so authorized, the city manager and key management staff shall make a written election to become a member or to be exempted from membership within sixty days after becoming employed in the position. In the absence of a written election, such person shall be a member.