<Tr> <Th> Surface elevation </Th> <Td> 4,600 ft (1,400 m) </Td> </Tr> <Tr> <Th> Frozen </Th> <Td> never </Td> </Tr> <Tr> <Th> Islands </Th> <Td> none </Td> </Tr> <P> The Blue Hole of Santa Rosa is a circular, bell - shaped pool east of Santa Rosa, New Mexico that is one of the most popular dive destinations in the US for SCUBA diving and training . The Blue Hole is an artesian well that was once used as a fish hatchery . It is a clear blue body of water with a constant 62 ° F (17 ° C) temperature and constant inflow of 3,000 US gallons per minute (11 m / min; 2,500 imp gal / min). While the surface is only 80 feet (24 m) in diameter, it expands to a diameter of 130 feet (40 m) at the bottom . </P>

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