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Mississippi River at Quincy Lock and Dam 21

Critical Stages
16' - Action
18' - Flood
21' - Moderate
25' - Major

Latest Observation

Updated: 2:00 PM CST 12/17/25

Status: No Flooding

Stage: 2.82 ft

Flow: 30.8 kcfs

Forecast

TimeStage (ft)Flow (kcfs)
6 PM 12/17 2.8 30.5
12 AM 12/18 2.8 30.5
6 AM 12/18 2.8 30.5
12 PM 12/18 2.7 29.3
6 PM 12/18 2.6 28
12 AM 12/19 2.6 28
6 AM 12/19 2.6 28
12 PM 12/19 2.7 29.3
6 PM 12/19 2.8 30.5
12 AM 12/20 2.9 31.8
6 AM 12/20 2.9 31.8
12 PM 12/20 3 33
6 PM 12/20 3 33
12 AM 12/21 3 33
6 AM 12/21 3 33
12 PM 12/21 3.1 34.3
6 PM 12/21 3.1 34.3
12 AM 12/22 3.1 34.3
6 AM 12/22 3.1 34.3
12 PM 12/22 3.1 34.3
6 PM 12/22 3.1 34.3
12 AM 12/23 3.1 34.3
6 AM 12/23 3.1 34.3
12 PM 12/23 3.1 34.3
6 PM 12/23 3.1 34.3
12 AM 12/24 3.1 34.3
6 AM 12/24 3.1 34.3
12 PM 12/24 3 33
6 PM 12/24 3 33
12 AM 12/25 3 33
6 AM 12/25 3 33
12 PM 12/25 3 33
6 PM 12/25 3 33
12 AM 12/26 3 33
6 AM 12/26 3 33
12 PM 12/26 3 33
6 PM 12/26 3 33
12 AM 12/27 3 33
6 AM 12/27 3 33
12 PM 12/27 3 33
6 PM 12/27 3 33
12 AM 12/28 3 33
6 AM 12/28 3 33
12 PM 12/28 3 33
6 PM 12/28 3 33
12 AM 12/29 3 33
6 AM 12/29 3 33
12 PM 12/29 3 33
6 PM 12/29 3 33
12 AM 12/30 3 33
6 AM 12/30 3 33
12 PM 12/30 3 33
6 PM 12/30 3 33
12 AM 12/31 3 33
6 AM 12/31 3 33
TimeStage (ft)Flow (kcfs)
2:30 PM 12/17 2.81 30.6
2:20 PM 12/17 2.8 30.5
2:10 PM 12/17 2.8 30.5
2:00 PM 12/17 2.82 30.8
1:50 PM 12/17 2.82 30.8
1:40 PM 12/17 2.8 30.5
1:30 PM 12/17 2.82 30.8
1:20 PM 12/17 2.8 30.5
1:10 PM 12/17 2.8 30.5
1:00 PM 12/17 2.81 30.6
12:50 PM 12/17 2.79 30.4
12:40 PM 12/17 2.78 30.3
12:30 PM 12/17 2.74 29.8
12:20 PM 12/17 2.74 29.8
12:10 PM 12/17 2.75 29.9
12:00 PM 12/17 2.74 29.8
11:50 AM 12/17 2.76 30
11:40 AM 12/17 2.75 29.9
11:30 AM 12/17 2.76 30
11:20 AM 12/17 2.78 30.3
11:10 AM 12/17 2.75 29.9
11:00 AM 12/17 2.74 29.8
10:50 AM 12/17 2.77 30.1
10:40 AM 12/17 2.82 30.8
10:30 AM 12/17 2.71 29.4
10:20 AM 12/17 2.78 30.3
10:10 AM 12/17 2.67 28.9
10:00 AM 12/17 2.71 29.4
9:50 AM 12/17 2.74 29.8
9:40 AM 12/17 2.77 30.1
Hydrograph for Mississippi River at Quincy Lock and Dam 21
140000' - At this approximate discharge, the Corps will raise the gates out of the water, creating "open river" conditions.
26.9' - Missouri Highway 168 east of Palmyra near the BASF plant closes near this height.
25.7' - At this height, the lock wall is inundated.
25' - Quincy Waterworks inundated.
21.9' - Near this level, the lock is closed to navigation. This level will vary with circumstance.
14' - Unprotected bottomlands flood.
12.3' - This is the upper limit of the target pool level at Lock and Dam 21.
12.2' - This is the target pool level for navigation at Lock & Dam 21.
12' - At some point between 11.6 to 12.1 feet, the Corps will lift all gates out of the river creating "open river" conditions, corresponding to an approximate discharge of 140,000 cfs.
11.8' - This is the lower limit of the target pool level at Lock & Dam 21.
DateStage (ft)
Jul 13, 1993 31.3
Jun 1, 2019 30.15
Jun 18, 2008 29.58
Apr 25, 1973 27.7
Apr 21, 2013 27.24
May 16, 2001 26.55
Jul 8, 2014 26.15
Oct 4, 1986 24.86
Jun 1, 2013 24.74
May 29, 1996 24.05
Oct 12, 2018 23.96
Apr 28, 1965 23.89
Apr 5, 1983 23.51
Apr 4, 1960 23.45
Jun 10, 1947 23.32
Jun 16, 2011 22.8
Apr 15, 1998 22.73
Apr 28, 2001 22.6
May 5, 2008 22.45
Apr 24, 2011 22.21

Data provided by the National Weather Service.