Christensen No. 1 is a private dam located in Fourth Crossing, California, along Steele Creek. Completed in 1951, this earth dam stands at 33 feet high and spans 750 feet in length, with a storage capacity of 69 acre-feet. The primary purpose of this dam is flood risk reduction, but it also serves irrigation and water supply needs in the region.

Managed by the California Department of Water Resources (DWR) and regulated by its Safety of Dams program, Christensen No. 1 has a low hazard potential and is reported to be in satisfactory condition as of its last assessment in September 2017. Despite its age, the dam undergoes regular inspections to ensure its safety and stability, with the most recent inspection conducted in December 2019.

With its strategic location and vital role in water resource management, Christensen No. 1 is a key infrastructure contributing to the overall resilience of the region against floods and water supply challenges. Its historical significance and ongoing maintenance highlight the importance of effective dam management in mitigating water-related risks in California.