The largest unit of the CUP, the Bonneville Unit collects and distributes water in both the Uintah Basin of eastern Utah, and the Bonneville Basin of central Utah. The Bonneville Unit provides water for irrigation and municipal and industrial uses. In addition, Bonneville Unit systems provide water for maintenance of aquatic habitats in natural streams, open water recreation, and flood control. For purposes of planning and construction the Bonneville Unit itself was divided into component systems. Working together, the systems develop, store, and transport water resources for the benefit of the people of Utah.
Several systems of the Bonneville Unit are complete and functioning. The Utah Lake Water Delivery System, the "final link" needed to complete the CUP, is under active construction and is scheduled for completion in 2026.