66 Pastures is a privately-owned irrigation dam located in Goshen County, Wyoming, along the Horse Creek Offstream. Built in 1910, this earth dam stands at a height of 16 feet and has a capacity of 1141 acre-feet for storing water for irrigation purposes. With a surface area of 82 acres and a drainage area of 0, the dam has a spillway width of 14 feet and is equipped with a valve outlet gate.

Despite its age, the dam at 66 Pastures is in fair condition, with a low hazard potential. Regular inspections have been conducted, with the last assessment performed in May 2017. The dam's risk assessment is classified as moderate, indicating the need for ongoing risk management measures. The surrounding area is represented by Liz Cheney, a Republican member of Congress from Wyoming.

Water resource and climate enthusiasts will appreciate the historical significance and functional importance of 66 Pastures in sustaining agricultural activities in the region. As a key infrastructure for irrigation, this dam plays a vital role in supporting local farming operations and ensuring water availability for crops. The dam's design and construction reflect early 20th-century engineering practices, highlighting the ingenuity and resourcefulness of past generations in harnessing water resources for agricultural development.