John Stock is a privately owned Earth dam located in Arvada, Wyoming, with a primary purpose of providing fire protection and serving as a small fish pond. Completed in 1970, this structure stands at 25 feet in height and spans 210 feet in length, with a storage capacity of 48 acre-feet. Situated on the Hepp Draw stream, John Stock is regulated by the Wyoming State Engineer's Office and undergoes regular inspections to ensure its fair condition and low hazard potential.

Despite its low hazard potential, John Stock poses a moderate risk due to its location and design characteristics. The dam features an uncontrolled spillway and a single outlet gate, with a hydraulic height of 20 feet and a surface area of 3 acres. While the dam has not been modified in recent years, its last inspection in July 2020 revealed a fair condition. With Liz Cheney representing Congressional District 00 in Wyoming, John Stock serves as a vital resource for fire protection and stock purposes in the region.

Water resource and climate enthusiasts are captivated by John Stock's role in providing essential services to the community, including fire protection and stock management. With its earth dam structure and stone core, this privately owned facility in Johnson County, Wyoming, highlights the importance of maintaining and inspecting dams regularly to ensure their safety and functionality. As a key asset in the region, John Stock's moderate risk level underscores the need for ongoing monitoring and risk management measures to protect surrounding areas and ensure optimal performance.