Sans Souci Island is an island in the Cedar River in the city of Waterloo, Iowa. The island has a population of between 40 and 50 residents and is in size, with most of the land area being woodland.[1] The island was severely affected by the Iowa flood of 2008. By June 10, 2008, the island's entire population was forced to evacuate following the breach of a sandbag dike.[2]