Walters, Glenn #1 - Large is a privately owned irrigation dam located in Farmington, Oregon, along the Tualatin River. Built in 1969, this earth dam stands at a height of 25 feet and has a storage capacity of 250 acre-feet. With a normal storage capacity of 132 acre-feet and a drainage area of 1.02 square miles, this dam plays a crucial role in providing water for agricultural purposes in the region.

Managed by the Oregon Water Resources Department, Walters, Glenn #1 - Large has a significant hazard potential and undergoes inspections every three years to ensure its structural integrity. The dam features a slide (sluice gate) outlet gate and has a spillway width of 0 feet. Despite not being rated for condition assessment, the dam continues to serve its purpose of irrigation, contributing to the local water resource management efforts.

Located within the jurisdiction of the state and subject to state regulation, Walters, Glenn #1 - Large serves as a vital infrastructure for water supply in the region. With a close proximity to the city of Farmington and under the supervision of the Portland District of the US Army Corps of Engineers, this dam is essential for sustaining the water needs of the surrounding agricultural lands.