14 inches today, trout at all depths . I've been aerating for about 1.5 months to keep a hole open. 4 inches of snow on top and lots of light getting thru. Green living weeds on the bottom Still. Haven't checked DO ...still liveable at 14 feet so it must be good so far. No gas smell from the holes or open aerator hole. We still have 2.5 months or 3 of ice cover coming up tho.