Dennis No. 2 is a private earth dam located in Sonoma, California, specifically in the city of Windsor. Completed in 1997, this dam stands at a height of 60 feet and has a maximum storage capacity of 148 acre-feet. It serves primarily for water supply purposes, including irrigation and water supply to the surrounding area. The dam is regulated by the California Department of Water Resources and falls under the Safety of Dams jurisdiction.

Situated on Tr Dry Creek, Dennis No. 2 plays a crucial role in managing the water resources of the region. It has a low hazard potential and has been assessed as being in satisfactory condition as of September 2017. The dam has a drainage area of 0.25 square miles and a surface area of 9 acres. With its strategic location and design, Dennis No. 2 ensures the efficient utilization of water for various purposes while adhering to state regulatory guidelines.

With its reliable infrastructure and consistent inspection and enforcement measures, Dennis No. 2 exemplifies responsible water resource management in California. The dam's compliance with state permitting, inspection, and enforcement requirements underscores its commitment to safety and sustainability. As a vital component of the local water supply system, Dennis No. 2 continues to contribute to the resilience of the region's water resources and highlights the importance of proactive dam management in mitigating potential risks associated with climate variability and water scarcity.