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Mississippi River at Grafton

Critical Stages
18' - Action
20' - Flood
24' - Moderate
29' - Major

Latest Observation

Updated: 7:00 AM CST 12/6/25

Status: No Flooding

Stage: 15.98 ft

Flow: 197 kcfs

Forecast

TimeStage (ft)Flow (kcfs)
12 PM 12/6 16 200
6 PM 12/6 16 200
12 AM 12/7 16 200
6 AM 12/7 16 200
12 PM 12/7 16 200
6 PM 12/7 16 200
12 AM 12/8 16 200
6 AM 12/8 15.9 186
12 PM 12/8 15.9 186
6 PM 12/8 15.9 186
12 AM 12/9 15.9 186
6 AM 12/9 15.9 186
12 PM 12/9 15.9 186
6 PM 12/9 15.9 186
12 AM 12/10 15.9 186
6 AM 12/10 15.9 186
12 PM 12/10 15.9 186
6 PM 12/10 15.9 186
12 AM 12/11 15.9 186
6 AM 12/11 15.9 186
12 PM 12/11 15.9 186
6 PM 12/11 15.9 186
12 AM 12/12 15.9 186
6 AM 12/12 15.9 186
12 PM 12/12 15.9 186
6 PM 12/12 15.9 186
12 AM 12/13 15.9 186
6 AM 12/13 15.9 186
12 PM 12/13 15.9 186
6 PM 12/13 15.9 186
12 AM 12/14 15.9 186
6 AM 12/14 15.9 186
12 PM 12/14 15.9 186
6 PM 12/14 15.9 186
12 AM 12/15 15.9 186
6 AM 12/15 15.9 186
12 PM 12/15 15.9 186
6 PM 12/15 15.9 186
12 AM 12/16 15.9 186
6 AM 12/16 15.9 186
12 PM 12/16 15.8 173
6 PM 12/16 15.8 173
12 AM 12/17 15.8 173
6 AM 12/17 15.8 173
12 PM 12/17 15.8 173
6 PM 12/17 15.8 173
12 AM 12/18 15.8 173
6 AM 12/18 15.8 173
12 PM 12/18 15.8 173
6 PM 12/18 15.8 173
12 AM 12/19 15.8 173
6 AM 12/19 15.8 173
12 PM 12/19 15.8 173
6 PM 12/19 15.8 173
TimeStage (ft)Flow (kcfs)
7:00 AM 12/6 15.98 197
6:30 AM 12/6 15.97 196
6:00 AM 12/6 15.97 196
5:30 AM 12/6 15.96 194
5:00 AM 12/6 15.96 194
4:30 AM 12/6 15.97 196
4:00 AM 12/6 15.97 196
3:30 AM 12/6 15.98 197
3:00 AM 12/6 15.94 192
2:30 AM 12/6 15.97 196
2:00 AM 12/6 15.96 194
1:30 AM 12/6 15.96 194
1:00 AM 12/6 15.96 194
12:30 AM 12/6 15.93 190
12:00 AM 12/6 15.96 194
11:30 PM 12/5 15.95 193
11:00 PM 12/5 15.96 194
10:30 PM 12/5 15.95 193
10:00 PM 12/5 15.96 194
9:30 PM 12/5 15.96 194
9:00 PM 12/5 15.95 193
8:30 PM 12/5 15.97 196
8:00 PM 12/5 15.99 199
7:30 PM 12/5 15.98 197
7:00 PM 12/5 15.99 199
6:30 PM 12/5 15.99 199
6:00 PM 12/5 15.98 197
5:30 PM 12/5 16 200
5:00 PM 12/5 16 200
4:30 PM 12/5 16.01 200
Hydrograph for Mississippi River at Grafton
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.
DateStage (ft)
Aug 1, 1993 38.17
Jun 7, 2019 35.17
Apr 28, 1973 33.12
Jun 18, 1844 32.13
May 7, 2019 32.1
Jun 4, 2013 30.94
Dec 31, 2015 30.91
Jun 29, 2008 30.8
Jun 15, 1858 30.7
May 29, 1995 30.4
Oct 9, 1986 29.67
May 6, 2017 29.58
Apr 25, 2013 29.52
Jun 30, 2015 29.51
Apr 15, 1979 29.38
Apr 2, 2019 29.03
May 24, 1943 29
Jun 11, 1903 28.7
Jul 2, 1947 28.65
Apr 30, 1944 28.6

Data provided by the National Weather Service.