Big Water is a town in Kane County, Utah, United States. The population was 475 at the 2010 census, up from 417 at the 2000 census. It is located 17 miles northwest of Page, Arizona, on US-89 near Lake Powell and the Glen Canyon Dam. It was originally called Glen Canyon City and housed workers who built the dam in the 1950s. Big Water made news in the 1980s as a polygamous colony of the Joseph clan.