Grant Morris is a private earth dam located in Thatcher, Arizona, along the Gila River - TR. Built in 1975, this structure stands at 44 feet in height and spans 488 feet in length. With a storage capacity of 196 acre-feet, Grant Morris serves the primary purpose of flood risk reduction in the region.

Managed and regulated by the Arizona Department of Water Resources, Grant Morris is subject to state permitting, inspection, and enforcement. The dam has a high hazard potential and a satisfactory condition assessment as of December 2017. Despite its age, the structure continues to play a crucial role in protecting the surrounding area from potential flooding events.

Situated in Graham County, Grant Morris is a vital component of the local water resource infrastructure. With its strategic location and key role in flood risk management, this earth dam serves as a testament to the importance of sustainable water resource management in the face of changing climates and increasing environmental challenges.