Sorry I’m a little out of touch so this may not be totally accurate. I’m ex ND and Bismarck specifically with relatives in the Williston area.
I’ve not heard of the Williston area being considered Sakakawea. My impression was that was still the river up there and some drive time was needed to go to the lake. That said it is still the same watershed and would think it would have walleyes.
Not too far from there is where the Yellowstone river empties into the Missouri. There may be other species available and seem to remember an uncle talking about paddlefish at one time.
Good luck and let us know how it goes.