Maple Grove, also known as Maple Grove Dam, is a private water resource structure located in Polk, Oregon. Completed in 1995, this earth dam serves primarily for irrigation purposes, with a storage capacity of 210 acre-feet and a surface area of 13 acres. Situated on an unnamed tributary of the Luckiamute River, Maple Grove Dam is regulated by the Oregon Water Resources Department and undergoes regular inspections to ensure its safety and compliance with state regulations.

With a low hazard potential and a moderate risk assessment rating, Maple Grove Dam is considered to be a reliable and well-maintained structure. Its spillway type is uncontrolled, with slide (sluice gate) outlet gates. The dam has not been modified since its completion and has not been rated for its current condition. While it does not have a designated Emergency Action Plan (EAP) in place, Maple Grove Dam remains an essential asset for irrigation and fish and wildlife pond purposes in the region.

Overall, Maple Grove Dam plays a crucial role in managing water resources in the area, providing essential irrigation support and contributing to the local ecosystem. Its location in a remote area with no downstream settlement ensures minimal risk to surrounding communities in the event of a failure. This private structure, designed by BOATWRIGHT, highlights the importance of sustainable water management practices and serves as a testament to the cooperation between private owners and state regulatory agencies in safeguarding our water resources for future generations.