Colo. Rev. Stat. § 35-49-105
No livestock water tanks constructed under the provisions of this article shall be used for irrigation purposes, and nothing contained in this article shall be construed as conferring upon the owner of any such livestock water tank a priority of use superior to any vested water right or to an adjudicated appropriation of water pursuant to state laws. Unless built upon an intermittent or perennial main stream, dams creating such livestock water tanks shall be deemed to have a rebuttable presumption that there is no injury to adjudicated water rights when built pursuant to the specifications set forth in section 35-49-103. If used solely for watering of livestock in areas known to be deficient in windmill water, having a pumping capacity of less than five gallons per minute, dams of greater capacity than those designated in section 35-49-103 may be constructed on any ephemeral stream, but in such event, the state engineer may require the construction of drainage facilities to reduce the water impounded in the reservoir to the capacity prescribed in section 35-49-103, within a thirty-six hour period.
C.R.S. § 35-49-105