In 1876, Colorado became the first state to officially adopt the prior appropriation doctrine in its Constitution. The doctrine is often described as “first in time, first in right.” Seniority is valuable: the needs of a senior water right holder are always met prior to those of a junior water right holder. Within Colorado, water rights are administered in priority by the State Engineer’s Office. There are division offices, as well as water courts, in each of the seven major river basins. The local work of administering water rights falls to the water commissioners. Colorado Cattlemen's Agricultural Land Trust.
Appropriations are confirmed and the priority of a water right is determined by proceedings in the Colorado Water Court.
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