Deer Flat Middle, also known as Lake Lowell Orchard Road Dam, is a federal-owned structure located in Canyon, Idaho. This earth dam, primarily designed for purposes other than flood control or irrigation, stands at a height of 14 feet and spans a length of 750 feet. Completed in 1911, it is situated near the Boise River and Snake River, with a drainage area of 75 square miles and a storage capacity of 63,000 acre-feet.

The dam's hazard potential is classified as high, with a fair condition assessment as of September 2019. While there is currently no spillway in place, the structure has been inspected regularly, with the last assessment conducted in September 2019. Despite its age, Deer Flat Middle remains a critical component of water resource management in the region, providing essential storage for agricultural and environmental needs.

As a key feature in the Walla Walla District, Deer Flat Middle plays a crucial role in water management and flood protection efforts in Idaho. With its location in a high-risk area and a significant storage capacity, continuous monitoring and maintenance are essential to ensure the safety and effectiveness of this vital infrastructure. For water resource and climate enthusiasts, Deer Flat Middle serves as a noteworthy example of the ongoing challenges and importance of dam infrastructure in the face of changing environmental conditions.