The state of California is advancing plans to develop the ambitious 1.5-million-acre-feet Sites Reservoir in the Sacramento Valley. Spearheaded by the Sites Project Authority, this $3-billion project recently issued a request for qualifications on January 9th for a construction manager at-risk. This major undertaking includes the creation of two primary dams and several secondary structures, along with significant infrastructure improvements such as bridges and road expansions. The reservoir aims to enhance water reliability and resilience in response to changing climate conditions and increasing drought frequency. Completion is expected by the end of 2032, marking a significant milestone in California's water management strategy.

The scope of the Sites Reservoir project encompasses the construction of two main dams, each standing approximately 270 feet high with bases spanning about 1,300 feet wide. These dams will be situated on Stone Corral Creek and Funks Creek. Additionally, seven saddle dams and three dikes of varying heights are planned. A key feature is the concrete overflow spillway on the northern edge of the reservoir, designed to manage excess water during heavy rainfall. The inlet/outlet works involve a sophisticated tunnel system connecting to downstream infrastructure, which will be constructed separately. Two new bridges and the widening of over seven miles of roads are also part of the project's extensive infrastructure upgrades.

Beyond the physical structures, the Sites Reservoir will play a crucial role in addressing water scarcity. By capturing stormwater during periods of high flow from the Sacramento River, the reservoir will serve as a vital resource during droughts. Importantly, the reservoir will be off-stream, ensuring that no rivers are obstructed. Fritz Durst, chair of the Sites Project Authority board of directors, emphasized the project's significance in enhancing water reliability for communities, agriculture, and the environment. The reservoir, located 65 miles northwest of Sacramento, will stretch approximately 13 miles long and 4 miles wide, reaching depths of 260 feet when filled. It will become California's eighth-largest reservoir, capable of supplying enough water to meet the needs of 7.5 million people for a year.

When completed, the Sites Reservoir will represent a monumental advancement in California's water infrastructure. Not only will it bolster water supply resilience, but it will also contribute to environmental sustainability. The project has garnered support from numerous local, state, and federal agencies, underscoring its importance in addressing future water challenges. With construction set to begin next year, the reservoir promises to transform water management practices in the region, offering a reliable solution to the growing demands and uncertainties posed by climate change.