Spencer Mill is a gravity dam located in Thompson Borough, Pennsylvania, along the Starrucca Creek. Built in 1919, this private-owned dam serves primarily for recreational purposes, offering a serene retreat for water resource and climate enthusiasts. With a height of 16 feet and a length of 180 feet, Spencer Mill has a storage capacity of 35 acre-feet, providing a surface area of 2 acres and draining a 3.9 square mile watershed.

Despite its historical significance and recreational value, Spencer Mill is facing challenges in terms of its condition assessment, which has been rated as poor. The dam's hazard potential is considered significant, highlighting the need for regular inspection and maintenance. The Pennsylvania Department of Environmental Protection oversees the regulation, permitting, inspection, and enforcement of this structure to ensure its safety and compliance with state standards.

Water resource and climate enthusiasts visiting Spencer Mill can appreciate its scenic beauty and historical importance, while also recognizing the importance of proper maintenance and risk management measures to ensure the safety of the dam and surrounding areas. With its unique design and location along the Starrucca Creek, Spencer Mill serves as a reminder of the delicate balance between human development and environmental stewardship in water resource management.