Sublett is a privately owned dam located in Cassia, Idaho, specifically in the city of Sublett. Completed in 1914, the dam serves the primary purpose of irrigation, with a storage capacity of 2400 acre-feet. The dam is situated on Sublett Creek Sinks and has a height of 47.7 feet, with a hydraulic height of 42.6 feet. The structure is primarily made of earth and stone, with a foundation of rock and soil.

Despite being classified as having a high hazard potential, Sublett is currently in fair condition, as assessed in May 2020. The dam has a spillway width of 70 feet and is equipped with slide gates for outlet control. With a drainage area of 46 square miles, the dam has a moderate risk assessment score of 3. Although there is no specific information on risk management measures or emergency action plans available, the dam is inspected biennially to ensure its structural integrity and overall safety for the surrounding area. For water resource and climate enthusiasts, Sublett presents an interesting case study of early 20th-century irrigation infrastructure in Idaho.