Name:   boataholic - Subject:   Water level Date:   3/11/2016 11:12:29 PM

Ala Power has apparantly switched to msl, mean sea level, where a full lake will be 491 and winter level will be 484.  The 490 full lake measurement we are used to was based on some very old error in calculating the height above sea level.  The old way is sometimes referred to as "martin datum".