Halsey Afterbay, located in Baxter, California, is a privately owned hydroelectric dam on Dry Creek. Built in 1913, this rockfill dam stands at a height of 38 feet and has a structural height of 40.2 feet. With a maximum storage capacity of 106 acre-feet and a normal storage level of 60 acre-feet, this reservoir covers a surface area of 9 acres and serves a drainage area of 3.5 square miles.

Managed by the Federal Energy Regulatory Commission, Halsey Afterbay has a high hazard potential and undergoes regular state inspections and enforcement. Despite its age, the dam remains in moderate risk condition. Equipped with an uncontrolled spillway and capable of discharging up to 2830 cubic feet per second, Halsey Afterbay is a vital component of the region's water resource infrastructure, providing both hydroelectric power and water storage for the surrounding area.

As a key player in California's water management system, Halsey Afterbay plays a crucial role in regulating water flow, mitigating flood risks, and generating renewable energy. With its historical significance as a century-old structure and its ongoing importance in the state's water resource management, Halsey Afterbay serves as a compelling example of how human-made dams continue to shape and support the environmental landscape in the face of changing climate conditions.