Upper Wilcox is a privately owned earth dam located in Coarsegold City, California, with a primary purpose of irrigation. Built in 1930, the dam stands at a height of 48 feet and has a storage capacity of 200 acre-feet. It is situated on an unnamed tributary to Picayunne Creek, contributing to the irrigation needs of the area while also providing recreational opportunities.

The dam is regulated by the California Department of Water Resources (DWR) under the Safety of Dams program, ensuring that it meets stringent inspection and enforcement standards. With a significant hazard potential, Upper Wilcox has been assessed as being in satisfactory condition as of September 2017. The dam has a drainage area of 0.9 square miles and covers a surface area of 13.7 acres, making it a vital water resource in the region.

Despite its age, Upper Wilcox continues to serve its intended purposes effectively, showcasing the importance of proper maintenance and regulation of water infrastructure. With a dedicated inspection frequency and a comprehensive emergency action plan, the dam remains a key component in the water management system of Madera County. Climate and water resource enthusiasts can appreciate the historical significance and ongoing relevance of Upper Wilcox in sustaining the local ecosystem and economy.