The allocation of water rights along the Colorado River has been a historical issue involving multiple regions for decades. This paper develops a model for this current situation. First, employ the model to propose the optimal solution among different competing interests of water availability involving general usage and electricity production. Clarify the criteria settling the conflicts of interests. Then, apply the model to the problem which water supply is inadequate for all demands, as well as recommend solutions and priorities. Finally, explain the outcome of the model when it is applied to the situations in which the demands in the stakeholder communities are no longer fixed (including population, agricultural, and industrial changes), the proportion of renewable technology exceeds the initial expectation, as well as the additional adopted measures of water and electricity conservation are present.