StateMod has been developed to represent the allocation and accounting of water rights in high fidelity for six basins in the State of Colorado. Major inputs to the model are historical monthly water demands for individual users, streamflow (historical or synthetically generated), water right seniority and allocation, crop efficiency and consumption patterns, operational rules, reservoir target storage levels. The StateMod workflow follows these main steps: i) input generation (if not using the baseline case); ii) model execution; iii) extraction of relevant information (e.g., demands and shortages) from relevant output files. The workflow can be executed in serial or have all required runs be parallelized on computing resources. Major outputs of the model are user level water demand, allocation and shortage, streamflow conditions post allocation and reservoir levels.