The site where Sandcastle currently sits was formerly a railroad yard for U.S. Steel. In 1988, Kennywood Entertainment bought the land and began construction on the park. Sandcastle officially opened for business in July 1989. The park was originally supposed to be called Splashdown, however park executives decided on Sandcastle.
The park has a total of 14 water slides including 3 speed slides. Other slides include the Blue Tooba Looba (which replaced Bermuda Triangle, the only closed slide in the park), Thunder Run, Tubers Tower and Cliffhangers. Other attractions at Sandcastle include a "lazy river," a large swimming pool, Mon-Tsunami, a wave pool, a hot tub and an area of water slides and water attractions designed specifically for children called Wet Willies. The park also features an entertainment complex called The Sandbar and a marina. In January 2007, the Chevrolet Amphitheatre, formerly known as the IC Light Amphitheatre, under plans by concert promoter Live Nation, was disassembled. According to new design plans, the new amphitheater will rest between Sandcastle's west perimeter and the Waterfront section of Homestead Borough along the Monongahela River. Sandcastle already had an existing amphitheatre on the property, but was outdated and was seldom used.
The only slide ever removed was where The Blue TubaLuba is today. It was called "The Bermuda Triangle". It was a body slide however, it had the same structure as a tube slide. It was removed in the early 2000s because of lack of popularity and Sandcastle needed new attractions.
The park is located in West Homestead, a suburb of Pittsburgh. The water park is located down the road from the Waterfront, a large shopping complex with stores, restaurants, and movie theaters. The park can be easily accessed via Interstate 376, and one PAT Transit bus line, the 59 Mon Valley (which also runs past Sandcastle's sister park Kennywood) runs near the park, but does not run up to it.