In 1926, Knoebel added a restaurant, a steam-powered Philadelphia Toboggan Company carousel, and a few simple games to his grove, marking the beginning of Knoebels Amusement Park. On July 4, 1926, he opened a large concrete swimming pool on the site of the old swimming hole. Featuring a filtration system that provided clean water instead of muddy creek water, the pool was named "The Crystal Pool". Since then, the park has developed around the pool, adding 50 rides, assorted games, concession stands, and other attractions. A campground with six sites opened behind the amusement park in 1962, and as of 2004, the campground covered with 500 sites.