I personally haven’t been out on Tonka this season but what I’ve been hearing and based off of past years, open water and deep weed edges. Now that the zeebs are cleaning up the lake big time I’m seeing weeds out to depths as deep as 25 FOW. More and more the last couple years there is a great open water bite the whole summer.
Here’s an article I put together about open water fishing with the input from a few very knowledgable open water ski fisherman.
http://www.in-depthoutdoors.com/magazine/think-summer/open-water-muskies/
Positioning the boat in about 20 fow and casting up to the weedlines is a classic approach. Mid lake humps and reefs, and just hitting the key pieces of structure. Points, inside turns and saddles are money. I’ve found, pretty much anywhere there is a hazard buoy on Tonka there are muskies.
For casting, you can’t go wrong with Double Cowgirls, Super Models, Medussas and Bulldawgs. Mag Dawgs at the smallest, with the good early summer, the water temps call for larger baits already.
If you hit this pattern hard enough, you’ll catch fish. You’ll get follows, and be able to see them with the clear water. Start looking at what kind of structure you’re seeing fish on, and then try to duplicate them on different pieces of structure. If you move fish come back to them on majors and minors. Like I said, log the hours and you’ll get them.
Also, fishing low light periods from about 7pm until 11pm and in the morning about 430a to 9 will be your best bet. Moonrise Moonset – be out fishing!