Stewart Gulch Main Fork is a vital flood risk reduction structure located in Boise, Idaho. Completed in 1998 by Morrison Knudsen Corp, this earth dam stands at a height of 76.3 feet and has a hydraulic height of 73.4 feet, offering protection to the surrounding area from potential flooding events. With a storage capacity of 61 acre-feet and a maximum discharge of 168 cubic feet per second, this dam plays a crucial role in managing water flow and reducing the risk of flooding in the region.

Owned and regulated by the Idaho Department of Water Resources, Stewart Gulch Main Fork is inspected regularly to ensure its structural integrity and functionality. The dam is classified as having a significant hazard potential, but its condition is assessed as satisfactory. With a very high risk assessment ranking of 1, it is clear that the importance of this structure in mitigating flood risks in the area cannot be overstated. The dam's controlled spillway, with a width of 56 feet, further enhances its ability to manage water levels during periods of high flow.

As a key component in the flood risk reduction infrastructure of Boise, Stewart Gulch Main Fork serves as a critical line of defense against potential water-related disasters. With its robust design and satisfactory condition, this dam continues to play a vital role in protecting the local community and surrounding areas from the impacts of flooding. Its presence underscores the importance of proactive water resource management and climate resilience efforts in safeguarding communities against the growing challenges posed by a changing climate.