Peterson No. 1 is a privately owned irrigation dam located in Weston, Wyoming, along the Black Thunder Creek. Built in 1976 by designer J.H. Coffman, this earth dam stands at 20 feet high and spans 615 feet in length, with a storage capacity of 246 acre-feet. Despite its low hazard potential, the dam is currently in poor condition, as assessed during the last inspection in July 2017.

The dam features an uncontrolled spillway with a width of 400 feet and is equipped with a single slide (sluice gate) outlet. While it is regulated by the State of Wyoming and subject to regular inspections, the dam's risk assessment indicates a moderate level of risk. It is crucial for water resource and climate enthusiasts to monitor the maintenance and management of Peterson No. 1 to ensure its continued safety and functionality for irrigation purposes, acknowledging its importance in the local water infrastructure.

Located in Edgemont, SD, within the Omaha District and Congressional District 00 of Wyoming, Peterson No. 1 plays a vital role in the water supply system of the area. With its historical significance dating back to the 1970s, this dam serves as a key asset for agricultural activities in the region, highlighting the intersection of water resource management, infrastructure maintenance, and climate resilience in the face of evolving environmental challenges.