Perrins Marsh, also known as Brown Pond, is located in Northmoreland Township, Pennsylvania, and is a privately owned recreational area situated along Whitelock Creek. The earth dam, completed in 1919, stands at a height of 6 feet and has a length of 60 feet, creating a storage capacity of 470 acre-feet. With a surface area of 84 acres and a drainage area of 1.8 square miles, Perrins Marsh provides a serene and picturesque setting for outdoor activities.

Despite its historical significance and recreational value, Perrins Marsh poses a high hazard potential due to its condition assessment rated as fair. The dam is regulated by the Pennsylvania Department of Environmental Protection, with state permitting, inspection, and enforcement in place to ensure its safety and maintenance. While the dam has not been modified over the years, regular inspections are conducted to mitigate risks and uphold the dam's integrity for public safety.

Enthusiasts of water resources and climate will find Perrins Marsh to be a captivating site, offering a glimpse into the intersection of human intervention and natural landscapes. As a privately owned recreational area with a rich history dating back to the early 20th century, Perrins Marsh serves as a reminder of the importance of sustainable dam management practices in safeguarding both the environment and local communities.