37' - Near this height, floodwater begins to impact Grafton City Hall.
33.5' - Nutwood Levee is Overtopped.
32.1' - Methodist Church at Main St. and Vine St. begins flooding.
31' - The hangars at the south end of Smartt field begin to flood.
30.9' - Missouri Route B from Washeon Road to Seeburger Road is closed near this height.
30.1' - Water reaches the intersection of Main Street and Maple Street.
29.1' - Water reaches Main at Church Street.
29' - Route 100 between Grafton and Alton at Clifton Terrace is flooded near this height.
28.8' - Water begins entering the north hangars at Smartt Field.
28.5' - Water begins entering the ramps on the north end of Smartt Field as the northwest and northeast corners are already flooded.
28.4' - Water reaches Main Street at the Vistors Center
28.3' - Intersection at Main (Route 100) & Route 3 is closed. Also at this level the Northeast Corner of Smartt Airfield begins flooding. Grafton Hills Drive is closed to all but local and select (UPS, FedEx, and Amazon) delivery traffic.
28' - Agricultural levee north of Highway 370 is overtopped, flooding a St. Peters recreational area around a lake near 370 and Truman.
27.6' - Beasley Fish Market at Main Street and Overmeyer begins flooding.
27.5' - The intersection at Main Street and Dagget Hollow begins flooding.
26.5' - At this height the entrance to the Illinois Youth Center-Pere Marquette becomes flooded, forcing the evacuation of those staying there.
26.4' - Residential flooding in Grafton occurs.
26' - Water distribution system begins to flood so emergency measures begin.
25.6' - Water surrounds base of Aerie's Resort at Main Street (Hwy 100) near Market.
25.5' - Brussels Ferry closes near this height. O'Jan's Fish Stand in Grafton closes near this height.
25.2' - The intersection at Main Street and Canal Street begins flooding.
25' - Ball field south of Main Street and Hawg Pit BBQ begin flooding.
24.9' - Water reaches the intersection of Main St. and Edwards St.
24.7' - City of Grafton begins to detour traffic along Route 100 (Main Street) at Evans Street. Also at this level the Catholic Church parking lot at Main & Evans begins flooding. This represents the lowest point on Main Street in Grafton.
24' - Roads within Chautauqua and Elsah begin flooding near this height.