Tower Fall is a 132-foot waterfall in the Tower-Roosevelt region of Yellowstone National Park. This popular waterfall on Tower Creek was named by members of the 1870 Washburn expedition. It first was called "Minaret Creek," but one member objected, stating that the name violated their agreement to naming objects for their friends. He claimed the name was in reference to "Minnie Rhett," a sweetheart of one of the other members. By unanimous vote, the name was reconsidered and the names "Tower Creek" and "Tower Falls" were applied. The 132-foot waterfall plunges as a near-perfect water column until it crashes onto the rocks at its base. Until 1986, a precarious boulder was perched on the lip of the falls, and in the spring of that year, without witnesses, it plunged to the bottom. Tower Creek has cut through the basalt formation, which make up the walls of the gorge. At the brink of the falls are eerie-shaped minarets or towers sculpted from rhyolitic basalt.