Spy Pond, also known as Spie Pond in the 17th and 18th centuries, is a 103-acre kettle hole pond located near the heart of Arlington, Massachusetts, United States, adjacent to the Minuteman Bikeway. Fifty thousand years ago, the area of Arlington where Spy Pond now sits was covered a mile deep in ice by the Wisconsin Glacier. Fifteen thousan…Spy Pond, also known as Spie Pond in the 17th and 18th centuries, is a 103-acre kettle hole pond located near the heart of Arlington, Massachusetts, United States, adjacent to the Minuteman Bikeway. Fifty thousand years ago, the area of Arlington where Spy Pond now sits was covered a mile deep in ice by the Wisconsin Glacier. Fifteen thousand years ago, the ice began to recede, leaving depressions or "kettle holes" in its wake. Initially filled with water from the receding glacier itself and then by natural runoff, the kettle holes eventually formed small lakes and ponds throughout the area.