Mompano, also known as Beaver Lake Dam, is a privately owned structure located in Echo Dell, Clackamas County, Oregon. Built in 1971, this earth dam stands at a height of 39 feet and has a hydraulic height of 35 feet, with a maximum storage capacity of 780 acre-feet. It serves as a crucial water resource on Abernethy Creek, with a drainage area of 12.7 square miles and a maximum discharge capacity of 1400 cubic feet per second.

With a high hazard potential, Mompano has been regulated and permitted by the Oregon Water Resources Department, ensuring regular inspections and enforcement to maintain its structural integrity. Classified as a needle-gated dam, it spans 720 feet in length and covers a surface area of 56 acres, providing essential flood control and irrigation benefits to the surrounding area. Despite its satisfactory condition assessment as of November 2020, the dam's emergency action plan and risk management measures warrant further attention for potential improvements and preparedness.

As a significant component of the water infrastructure in the region, Mompano plays a vital role in supporting water supply and management efforts in Clackamas County. Its location within the Portland District of the US Army Corps of Engineers underscores its importance in safeguarding against potential flooding events and ensuring the resilience of Abernethy Creek's ecosystem. Climate and water resource enthusiasts can appreciate the complexities and importance of structures like Mompano in maintaining a balance between water conservation, safety, and environmental protection in Oregon's diverse landscape.