The Sites Reservoir is a proposed offstream reservoir project west of Colusa in the Sacramento Valley of northern California to be built and operated by the Sites Project Authority. The project would divert water from the Sacramento River upstream of the Sacramento–San Joaquin River Delta through existing canals to a new reservoir 14 miles away…The Sites Reservoir is a proposed offstream reservoir project west of Colusa in the Sacramento Valley of northern California to be built and operated by the Sites Project Authority. The project would divert water from the Sacramento River upstream of the Sacramento–San Joaquin River Delta through existing canals to a new reservoir 14 miles away. Annual yield would depend on precipitation and environmental restrictions.