Feldspar is a private-owned dam located in Johnson, Wyoming, with the primary purpose of irrigation. Completed in 2009, this earth dam stands at 34 feet in height and has a storage capacity of 108 acre-feet. The dam serves multiple purposes including fire protection, stock watering, and small fish pond maintenance, while being regulated by the State Engineer's Office.

Situated on the Grapnel Draw river, Feldspar boasts a relatively low hazard potential and fair condition assessment as of October 2019. With a spillway width of 30 feet and a maximum discharge of 231 cubic feet per second, the dam ensures effective water management for the surrounding area. Despite its moderate risk assessment level, the dam is inspected every 5 years to ensure its structural integrity and safety measures are up to standard.

With Liz Cheney (R) representing the area in Congress, Feldspar remains a crucial water resource within the Omaha District. The dam's location along I-90 and its contribution to the local irrigation and water supply systems highlight its significance in sustaining agriculture and wildlife in the region. For water resource and climate enthusiasts, Feldspar serves as a prime example of efficient dam infrastructure supporting various essential functions while adhering to rigorous state regulatory standards.