The lake is 5 by 6 miles ( 8.0 by 9.7 km ) across , with a caldera rim ranging in elevation from 7,000 to 8,000 feet ( 2,100 to 2,400 m ) and an average lake depth of 1,148 feet ( 350 m ) .
The lake has an average depth of 1,148 feet ( 350 m ) .