Purdy is a privately owned earth dam located in Arvada, Wyoming, along the South Fork Crazy Woman River. Built in 1966 for irrigation purposes, this dam stands at a height of 30 feet and has a storage capacity of 766 acre-feet. With a surface area of 53 acres, Purdy serves as a vital water resource for the surrounding area, providing water for agricultural activities.

Despite being categorized as having a low hazard potential, Purdy is regularly inspected and maintained to ensure its structural integrity. The dam has been assessed to be in fair condition as of August 2017, with an inspection frequency of every 5 years. In the event of an emergency, Purdy has one uncontrolled outlet gate and a spillway width of 200 feet to manage water flow.

Climate and water resource enthusiasts will appreciate Purdy's role in supporting irrigation activities in the region, as well as the measures in place to mitigate risks and ensure its continued operation. As part of Wyoming's water infrastructure, Purdy contributes to the sustainable management of water resources in the area, highlighting the importance of maintaining and monitoring dams for both agricultural and environmental purposes.