East Cellers 9-499-4, located in Weston County, Wyoming, is a Federal-owned dam constructed in 1949 by the USDA Forest Service for fire protection, stock, and small fish pond purposes. The dam, standing at a height of 23 feet with a structural height of 28 feet, is primarily an earth dam with a buttress core type, built on soil foundations along the O'Keefe Draw river. With a storage capacity of 56 acre-feet and a surface area of 7 acres, the dam serves multiple functions including fish and wildlife pond and recreation.

Despite its low hazard potential and moderate risk assessment, East Cellers 9-499-4 has not undergone a recent condition assessment, with the last inspection conducted in June 2010. The dam, regulated by the State of Wyoming through the SEO, has a spillway width of 20 feet and a maximum discharge rate of 2808 cubic feet per second. While the dam has not been modified over the years, it is essential for water resource and climate enthusiasts to monitor its condition and emergency preparedness measures, given its critical role in providing essential services to the surrounding area.