Assertion: lake's surface area | /r/CapableOf | vary at mid-1980
Facets:
value: to about 950 square miles
type: OTHER
value: at its lowest level in 1963
type: TEMPORAL
Source sentences:
text: Its surface area has varied from about 2,400 square miles (6,200 square km) at its highest levels in 1873 and the mid-1980s to about 950 square miles (2,460 square km) at its lowest level in 1963.