Warriner No. 1 is a historic earth dam located in Sheridan, Wyoming, along the Hammel Draw river. Built in 1923 for irrigation purposes, this dam stands at a height of 19 feet and has a storage capacity of 78 acre-feet. Despite its low hazard potential, the dam is currently classified as having poor condition, with the last inspection in August 2017 revealing areas in need of improvement.

Managed by private owners, Warriner No. 1 is regulated by the Wyoming State Engineer's Office and undergoes regular inspections and enforcement measures. The dam features a single valve outlet gate and an uncontrolled spillway with a width of 20 feet. While its primary purpose is irrigation, the dam also serves for fire protection, stock watering, and small fish pond purposes. Situated in a scenic location about 8 miles from Sheridan, Warriner No. 1 presents a moderate risk level that necessitates ongoing risk management measures to ensure its continued safety and functionality for the surrounding community.