Rio Vista is a city located in the eastern end of Solano County, California in the San Francisco Bay Area—either in the East Bay or the North Bay, depending on what definition is used—on the Sacramento River, in the Sacramento River Delta region. The population was 7,360 at the 2010 census.
Rio Vista was visited by a lost humpback whale in 1985, despite being 60 miles (100 kilometers) upriver from the Pacific Ocean. The young whale, nicknamed "Humphrey", attracted throngs of curiosity seekers before he was eventually guided back to sea by rescuers. Again in May 2007, humpbacks were sighted in Rio Vista. "Delta" and "Dawn," mother and calf, stopped at least twice in the river near the town.
Rio Vista is home to the annual Bass Festival in October.
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Population, household and median age statistics are based primarily on the 2010 US Census data projected forward to the present day.