Duncan is a privately owned Earth dam located in Sheridan, Wyoming, along the Jennings Gulch river. Built in 1939 by designer Paul F. Anderson, this dam stands at a height of 33 feet and has a reservoir storage capacity of 59 acre-feet. Despite its low hazard potential, recent inspections have rated its condition as poor, highlighting the need for maintenance and potential repairs to ensure its long-term safety and functionality.

Situated in a picturesque setting with a surface area of 5 acres, Duncan serves as a vital water resource for the surrounding area. The dam's primary purpose, categorized as 'Other', underscores its importance in managing water flow and storage. Although currently in a state of disrepair, Duncan's historical significance and contribution to the local ecosystem make it a valuable asset that warrants attention and preservation efforts.

With Liz Cheney representing Congressional District 00, Wyoming, where Duncan is located, there is a clear opportunity for advocacy and support for the dam's restoration and upkeep. As water resource and climate enthusiasts, it is crucial to recognize the role of structures like Duncan in sustainable water management and to advocate for the necessary resources and interventions to safeguard these critical assets for future generations.