Morrow Brothers Reservoir, also known as Morrow Brothers (Jefferson), is a privately owned irrigation reservoir located in Madras, Oregon. Built in 1970, this earth dam structure stands at a height of 23 feet and has a maximum storage capacity of 170 acre-feet. The reservoir primarily serves the purpose of irrigation and is regulated by the Oregon Water Resources Department, with state permitting, inspection, and enforcement in place.

Situated on Willow Creek in Jefferson County, the Morrow Brothers Reservoir covers a surface area of 17 acres and has a drainage area of 25.4 square miles. With a low hazard potential and a condition assessment that is currently not rated, the reservoir undergoes inspections every six years to ensure its safety and functionality. While the spillway type and width are not specified, the dam has a hydraulic height of 20 feet and a structural height of 24.5 feet.

Managed by the Natural Resources Conservation Service, Morrow Brothers (Jefferson) plays a crucial role in supporting agricultural activities in the region by providing irrigation water to the surrounding farmlands. With its modest size and efficient design, this reservoir contributes to the sustainable utilization of water resources in the area while enhancing the resilience of local agriculture to changing climate conditions.