With the proper geology and the installation of strategic dams, rivers will grow and erode a temporary land structure within the flow known as a sandbar. The pre-dam usage of such structures was to supply overnight sleeping quarters for trappers, voyageurs, missionaries, and military personnel. Lacking any well-established vegetation that will give rise to a permanent island, they were specifically chosen because the woodless mass lacked any large mosquito populations. The tree and brush infested shorelines were a living hell due to these flying hypodermic needles and a vast array of spiders, snakes, and other vile creatures. With modern hydroelectric dams in place, river flows can be throttled and ensure that sand bars will form, stabilize, and then disappear in a huge downpour. These party bars are the favorite of young people in America in the summer. Utilizing the reduced rainfall, high temperatures, and ample extended sunshine, they become weekend hangouts that require low draft boats to access the remote sites. As the party goers assemble on the beaches, the supplies of food, entertainment, and the most precious cargo of all, alcohol, are unloaded and distributed. These transitional teenagers are in training for the adult years and are cutting their teeth on the mammal mating ritual and all its intricacies. Music permeates the air as the sun sets, and young livers start filtering ethyl alcohol and launch it off to the brain via the red rivers of the blood vessels. Dancing takes place vertically at first, and then horizontally, as the inhibitions are cast into the flowing stream. Their spent bodies then fall into a deep sleep as the intertwined humans conserve precious heat in the cool night. As the summer ends, the revelers disperse. In time, the sandbar erodes because it lacks stability, but its tiny little constituents wash downstream into the future, to coalesce into another sandbar. The offspring of the now deceased returns, and the ritual repeats.