hard to find good ice this early in the season and ive seen some yrs. its too thin to fish all year long. as far as depths there is no pattern. ive got them set under the ice in the middle of the lake! if you do go this early id stick to the coves away from the current. ive seen 16in. of ice then go 50yrs. and only 3in.! glazier is just a wide point in the st. francis river after all. good luck!