Isom, also known as Austin, is a privately owned irrigation dam located in Granger, Wyoming. Built in 1976, this earth dam stands at a height of 20 feet with a hydraulic height of 15 feet and a length of 1790 feet. It serves multiple purposes including irrigation, fire protection, stock, and small fish pond management. The dam has a storage capacity of 3635 acre-feet and covers a surface area of 268 acres, drawing water from the Austin Wash and TR Black Rock Drw rivers.

Despite being classified as having a low hazard potential, Isom has a moderate risk assessment rating. It is regulated by the state of Wyoming and falls under the jurisdiction of the State Engineer's Office. The dam's spillway type is uncontrolled with a width of 10 feet, and it features a single slide (sluice gate) outlet gate. While the dam has undergone inspections in the past, its condition assessment is currently listed as "Not Rated," with the last inspection conducted in October 2009.

For water resource and climate enthusiasts, Isom presents an intriguing case study of a privately owned irrigation structure in Wyoming. Its design and construction details, along with its multiple purposes and risk assessment, offer valuable insights into the management and regulation of water resources in the region. Further research and monitoring of Isom's condition and performance could provide valuable data for understanding the intersection of water infrastructure, climate resilience, and regulatory processes in the area.