Cook No. 2 is a privately owned earth dam located in Healdsburg, California, along the Tr Dry Creek. Built in 1961, this dam serves primarily as a water supply source for irrigation and other purposes. Standing at a height of 35 feet with a hydraulic height of 31 feet, it has a storage capacity of 82 acre-feet and a surface area of 6 acres.

Managed by the Natural Resources Conservation Service, Cook No. 2 is regulated by the California Department of Water Resources for safety and inspection. With a high hazard potential and a satisfactory condition assessment as of September 2017, this dam is subject to regular inspections to ensure its structural integrity and resilience to potential risks. Although no spillway type or maximum discharge information is available, its location in Sonoma County underscores its importance in water resource management for the region.

Enthusiasts of water resources and climate will find Cook No. 2 a fascinating example of a vital infrastructure supporting water supply and irrigation in California. Its historical significance, design characteristics, and regulatory oversight make it a noteworthy structure contributing to the management of water resources in the region, highlighting the intersection of engineering, conservation, and environmental sustainability in addressing the challenges posed by climate change.