The water level in Devils Hole is monitored daily by the National Park Service and occasionally by the U.S. Geological Survey . During the late 1960s , the water level dropped dramatically in response to pumping in the Ash Meadows area , in the immediate vicinity of the cavern . After the cessation of pumping , the water levels recovered until about 1986 , when the water level began to decline . Pronounced changes in the water level resulted in response to the 1992 Landers/Little Skull Mountain earthquakes and the 1999 Hector Mine earthquake . Since December 2005 , the water level in Devils Hole has been rising , and by December 2008 , the water level had risen to its highest level since 1993
1999 Hector Mine earthquake
1999 Hector Mine earthquake
Devils Hole pupfish