20' - 260th St begins to flood west of the bridge.
19' - Water reaches the bottom of the bridge on McHardy Rd.
16' - Highway 11 north of Corson is flooded and may be closed. McHardy Rd may begin to flood.
14' - Water approaches Highway 11 north of Corson and may begin to flood the lowest spots.
12.5' - The athletic fields at Pioneer Park begin to flood.
11' - The nursery near the mouth of Split Rock Creek begins flooding if the Big Sioux River is high enough to cause a backwater effect. Highway 11 north of Highway 42 can be flooded if Beaver Creek flows are also high.
9' - The parking lot at the racetrack may be flooded and the lower portions of McHardy Park begins to flood.
8.5' - Flooding of the lower lying agricultural land begins.
5.5' - Portions of the short walking trail in McHardy Park begins to flood.