Every now and then I look over maps of the areas in and around Mason City.  I noticed that about 18 miles north of Mason City, practically on a straight line from Jodi's apartment complex, is Kuennen's Quarry.  I read up on it and someone posted a review on a quarry diving website: "The pit is located in a county park, and access is easy and free. I think the place can be very nice for a picnic-diving event. Water temperature was 40 degrees. *My only concern about the place was the underwater junk in the northeastern section of the lake. I believe divers should stay distant from the cars (one car is in vertical position)* and old rusty heavy equipment to avoid any potential injuries or accidents."

Just out of curiosity: was that area searched or ever been an area of interest in the investigation?   I know its a long-shot, but thought I would ask.