"Splash Mountain is the first log flume ever built for a Disney park. Log flumes, first cousin to the roller coaster, take guests on a thrilling journey through a twisting, turning trough filled with fast flowing water. As the finale nears, the boats climb to the top of the highest hill and plunge down into the water below. In the case of Splash Mountain, that plunge would be more that 54 feet down, as big as any that had ever been built."
-Disneyland: The Nickel Tour