The thing with the back waters is that just around a bend or behind a bunch of people on a community hole a person can hit pay dirt. Water depth and current changes are so frequent that one never knows just where fish might choose to hang out. Community holes are great for kids to mess with other kids and to sit and have a social beer or two but if you want serious fishing just get away from the crowds. A person seldom has to got far to get away.
Backwaters can be really different from other waters too. When the dregs of winter’s cold put fish in the deepest water in most waters, those backwater fish, especially those with current acclimation, can be found right under the ice in some very shallow water at times….like under 6 foot type of shallow. Since backwaters generally require anglers to search, I always opted to leave the flasher in the basement along with the portable and just open ice it, drilling lots of holes and focusing on water under 15-18 feet in depth….and yes, always fishing the entire column to right under the ice. Some of the largest crappies I have caught and seen caught under the ice have come from a foot under the bottom of the ice on nice bright days with some snow on the ice to cover shadows.
Lake Zumbro will offer some decent fishing if one learns to get away from the crowds and to keep his chops shut if he starts catching. My best fishing came from the open side door of the van way away from people with my catch pail well out of sight of others in the van. If people came along I’d shut off the flasher and say the battery died on me and fishing sucked. And as a rule my fish were taken at mid to upper levels in the water column regardless of what the weather was like or the how the barometer read. A glow red Forage jigging spoon in 1/16 ounce got the nod most of the time with one hook holding a real thin action heavy plastic tail. White was usually good.