"At one point there was an amusement park built at the western end of the pond, but it burned down in 1902 and was never rebuilt.
In 1961, the Middlesex County Commissioners, then managing the land, proposed leveling a significant portion of the preserve for a parking lot and other "improvements". They had already leveled an acre of woodland for access to the public beach. The Commissioners were sued to stop the destruction of the existing environment. Judge David A. Rose, sitting in the Massachusetts Superior Court, ruled that Walden’s deed donating the property to the Commonwealth required preservation of the land and barred further development. This decision achieved national recognition and Judge Rose received hundreds of letters from school children across the country thanking him for saving the land.
In 1977, the Commonwealth of Massachusetts installed a porous pavement parking area at Walden Pond as a special Technology Transfer demonstration project, following methodology generated by the U.S. Environmental Protection Agency in 1972. The porous pavement still looks good and works well decades later, despite more freeze-thaw cycling than most other parts of the world."
Just in case anyone wanted a short summary of our second lecture.