Hidden Lake Dike, located in Marlboro, Vermont, along Whetstone Brook, is a historic masonry dam completed in 1850. It stands at 9 feet tall with a length of 135 feet, providing a storage capacity of 115 acre-feet. The dam primarily serves recreational purposes, offering a surface area of 19 acres for outdoor activities.

Despite its age, Hidden Lake Dike is regulated and inspected by the Vermont Department of Environmental Conservation, ensuring its structural integrity and safety. The dam has a low hazard potential but is rated as being in poor condition as of the last inspection in July 2015. However, with an inspection frequency of every 10 years, efforts to maintain and assess the dam's condition are ongoing to mitigate any risks associated with its operation.

With its picturesque location and historical significance, Hidden Lake Dike serves as a vital part of the local landscape and water resource infrastructure. As climate change continues to impact water resources, the management and maintenance of structures like Hidden Lake Dike are crucial in ensuring the protection of communities and the environment against potential hazards and risks associated with aging infrastructure.