Williamson No. 1 is a significant dam located in Shingle Springs, California, along the Tr Weber Creek. Completed in 1926, this earth dam stands at a height of 42 feet and has a hydraulic height of 34.4 feet. The primary purpose of Williamson No. 1 is for water supply, serving irrigation, recreation, and water supply needs in the area. With a storage capacity of 117 acre-feet and a surface area of 11 acres, this dam plays a crucial role in water resource management in El Dorado County.

Despite its historical significance, Williamson No. 1 is currently assessed as being in poor condition, with a significant hazard potential. The dam is privately owned and regulated by the California Department of Water Resources, Safety of Dams division. Regular inspections are conducted, with the last assessment completed in February 2021. Efforts are underway to address the condition of the dam and ensure that it continues to fulfill its important role in water management and supply in the region.

As a key infrastructure for water supply, Williamson No. 1 is a vital resource for the local community and surrounding areas. With its age and current condition in mind, ongoing maintenance and potential upgrades are essential to ensure the safety and reliability of this dam for the future. Climate and water resource enthusiasts will find interest in the history and current status of Williamson No. 1, as well as the efforts being made to address its condition and maintain its important role in the region's water supply system.