Lake Hattie, located in Albany County, Wyoming, is a privately owned irrigation reservoir with a significant storage capacity of 130,182 acre-feet. Constructed in 1912, the earth dam stands at a height of 43 feet and has a spillway width of 100 feet for uncontrolled releases. The reservoir covers a surface area of 3,032 acres and is fed by the offstream flow of the Laramie River.

With a drainage area of 31.6 square miles, Lake Hattie plays a crucial role in supporting agricultural activities in the region. The dam, designed by Paul A. Rechard, is regulated and inspected by the Wyoming State Engineer's Office, ensuring its structural integrity and compliance with state regulations. Despite being categorized as having a significant hazard potential, the dam's condition assessment in 2020 rated it as fair, indicating a moderate risk level.

Although Lake Hattie's primary purpose is irrigation, the reservoir also serves as a recreational spot for fishing and boating enthusiasts. As a key water resource in the area, the reservoir's management and maintenance are essential to sustain water supply for agricultural operations and preserve the ecosystem. Climate and water resource enthusiasts can appreciate the engineering behind Lake Hattie and its role in supporting both human activities and environmental conservation efforts.