Mayhew Lake, located in Becker, Minnesota, is a state-regulated body of water that serves multiple purposes, with a primary dam type of gravity. Built in 1949, this dam stands at a height of 8 feet, with a hydraulic height of 5 feet and a structural height of 9 feet. With a storage capacity of 3100 acre-feet and a drainage area of 28 square miles, Mayhew Lake covers a surface area of 128 acres and has a maximum discharge of 675 cubic feet per second.

Despite its low hazard potential, Mayhew Lake has a satisfactory condition assessment as of November 2017 and is inspected every 8 years to ensure its safety and functionality. The dam is associated with Mayhew Creek and is managed by the Minnesota Department of Natural Resources. With its historic significance dating back to the mid-20th century, Mayhew Lake remains an important water resource in Benton County, Minnesota, contributing to flood control and water storage in the region. For water resource and climate enthusiasts, Mayhew Lake offers a fascinating glimpse into the intersection of infrastructure, conservation, and environmental management in the North Star State.