The upper Rio Grande Water Operation Model (URGWOM) is a suite of tools developed cooperatively by water management agencies in New Mexico to better understand, predict, plan, and account for surface water movement through the Rio Grande system in New Mexico. Included in this suite of tools are several daily timestep RiverWare models used to develop annual operating plans, track and account for water use by water type, and perform 10 year planning analysis. However, the computational burden of the daily timestep models makes it difficult to evaluate a large range of potential scenarios or management options, or perform long term planning analysis. In addition, the surface water system is impacted directly by the groundwater system, and both are affected by human demands. Simulation of the connections between these systems is not comprehensive in the daily timestep surface water operations models.