the main river channel for the most part is fairly uniform. There are some bottom changes and some up and down rifts also in the main channel. I used my map when I first got it to show backwaters, channels, cuts, and winddams. and the bottom and sand flats are always changing from year to year with strong currents, melting, and spring storms, I can see if they made a good contour map, that the next year it would be all wrong anyway. the only map I have seen of pool 2 is the dnr Metro Mississippi River Guide, and and the Mississippi River Guide I’m sure starts at Hastings and goes downstream. Jack..