Looking for water in a sea of corn

[DiverQueen]

Look a little to the south too! Lake Okoboji in Iowa is a destination!
As is the Mason City "pit".  Near Decorah, Iowa is Blue Pit which is also a trophy trout lake, you may want to check with Iowa DNR about diving there first! 
But seriously, Albert Lea sits right on a lake!  I've ice fished on Freeborn Lake, Minnesota Lake is just northwest on hwy 22.  Travel farther west to Fairmont and find a little gem called RLT Divers and the chain of lakes Hall, Bud and Sisseton as well as East Chain.  Go north to Faribault there's Canon, Shields, French Lakes.  Head towards Mankato on 60 and you will encounter the Sakatah Lake State Park, Lake Francis and Lake Elysian....Trophy walleye at Madison Lake! 
Go to Fishing Tackle shops and ask about local lakes or pick up a copy of "Sportsman's Connection" fishing map guide.  These booklets provide maps with dept and contour info, secchi disc clarity and other data! 
Best wishes and good luck!