Middlefield Reservoir, located in Fremont, California, is a vital offstream water supply resource managed by the local government. Completed in 1958, this Earth-type dam stands at a height of 147 feet and spans 1017 feet, providing a maximum storage capacity of 22 acre-feet. With a surface area of 2 acres, Middlefield Reservoir serves as a crucial water source for the region, especially in times of high demand.

This reservoir is regulated by the Department of Water Resources (DWR) and is subject to regular inspections to ensure its safety and functionality. Despite its high hazard potential, Middlefield Reservoir has been assessed as satisfactory in condition as of September 2017. Emergency action plans are in place, although details on their last revision and meeting guidelines are not available. As a key water supply infrastructure in Alameda County, Middlefield Reservoir plays a significant role in water management and climate resilience efforts in the region.

For water resource and climate enthusiasts, Middlefield Reservoir offers a fascinating glimpse into the intersection of infrastructure, water supply, and environmental sustainability. Positioned within the Sacramento District, this reservoir not only meets the water needs of the local community but also highlights the importance of effective dam management and regulatory oversight. As climate change impacts water resources, understanding and monitoring structures like Middlefield Reservoir become increasingly crucial for ensuring water security and resilience in the face of evolving environmental challenges.