33.29' - Flood waters reach the instrument shelf of the manometer gage house.
31' - Floodwaters will threaten the wastewater treatment facility near this height.
30.5' - Flood waters reach the floor of the gage house.
27.9' - U.S. Highway 51 south of Vandalia begins to flood near this height.
27.5' - Near this level, the left bank levee just south of the U.S. Highway 51 bridge is overtopped.
26' - The Dively and Vandalia Levees begin to be overtopped.
25.8' - Along South 4th Street, numerous homes begin flooding near the St. Clair Street intersection.
25.5' - South 4th Street begins flooding near and south of Jefferson Street in Vandalia.
23' - Agricultural levee begins to be slightly overtopped. No residences are affected at this level.
19.2' - State Highway J just east of County Road 206 begins to flood near this height.
18' - Flood Stage. Minor flooding begins. Unprotected farmland begins to flood.