Kay Lake is a privately-owned reservoir located in North Plains, Oregon, with a primary purpose of irrigation. Built in 1963, this earth dam stands at a height of 33 feet and has a storage capacity of 50 acre-feet, serving as a critical water source for the surrounding agricultural community. The dam's maximum discharge capacity is 145 cubic feet per second, making it a vital component of the local water resource infrastructure.

Managed by the Oregon Water Resources Department, Kay Lake is subject to state regulation, inspection, and enforcement to ensure its structural integrity and operational safety. The dam has a high hazard potential, but its condition assessment as of December 2020 was deemed satisfactory. Equipped with needle outlet gates, the reservoir covers a surface area of 3.7 acres and drains a 0.4 square mile watershed, contributing to the conservation and distribution of water resources in the region. With its strategic location along McKay Creek, Kay Lake plays a crucial role in sustaining agricultural activities and mitigating the impacts of climate variability on water availability.