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Ice is not very thick and varies around the 1' mark, possibly on the weak side for driving on. The lake surface has rugged ice with little snow and is ideal for walking or driving. I saw a few trucks and shacks. This is my 2nd ever trip to Iroquois. My 1st was slow at the bridge last week when I iced one pike. This time I went to the town site and cover over 500 yards of reed line left and 500 yard right plus some deep water. Whitefish was finally located close to 4 pm and quickly filled my limit. They were 19-20" and 3-4# each and had a sweet flavor. They take darter and wireworm but I couldn't feel the bite. Flasher marked them atop the weeds and their tugging was felt by jigging every few seconds. I lost one auger bit at the beginning due to rugged ice and had to manage bumpy and noisy drills with one blade.
I have yet to find walleye or burbot there. I will try deep basin at my 4th trip there. The whites I found were in 9'-10' of water in weed bed as you suggested before. I never arrived earlier than 10 AM. They bite before noon and again aggressively after 3 pm until sunset. Sight fishing works but it is too dark after 3:30 pm. I could feel 1/3 of the bites. I use a spoon or darter plus a wireworm 12" above, similar to what people use in the Great Lakes. For some reason my jigging didn't spook them in the past two weekends. They are indeed better in taste.
The Burbot are hard to come by at this time of year, although they can be caught. In March you can't keep them off. Walleye are in the basins during the day, however after 3pm they move in quite shallow, I often catch them in 7-10 feet of water along sand flats. Until the last 2 years you literally couldn't catch a whitefish on anything more significant than a wire worm or an 1/8th ounce jig, even bait would make them wary. Last year I had a few great days using a 1/4 oz pk spoon with a minnow head. In that lake the whitefish do tend to run on time cycles, they bite well from 9-10, 11-12, and again solidly after 2, I can't explain it but it's always been that way. You catch the odd one in the times between but they come quite consistently in those periods.
The whites actually only get more aggressive as the winter progresses, the whole lake actually wakes right up. Last year my biggest issue was avoiding the mess of 4-5" perch that seemed to love the pk spoons, when I found the areas where they weren't the walleye came right in and aggressively.