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Hydrograph River at a Glance Download
Mississippi River at Quincy Lock and Dam 21 Tailwater (ft)Flow (kcfs)Observed: 4.05 ft at 6:00AM Nov 29, 2021Observed: 4.06 ft at 8:00AM Nov 29, 2021Observed: 4.09 ft at 10:00AM Nov 29, 2021Observed: 4.09 ft at 12:00PM Nov 29, 2021Observed: 4.1 ft at 2:00PM Nov 29, 2021Observed: 3.82 ft at 4:00PM Nov 29, 2021Observed: 3.77 ft at 6:00PM Nov 29, 2021Observed: 3.78 ft at 8:00PM Nov 29, 2021Observed: 3.75 ft at 12:00AM Nov 30, 2021Observed: 3.87 ft at 2:00AM Nov 30, 2021Observed: 3.96 ft at 4:00AM Nov 30, 2021Observed: 3.99 ft at 6:00AM Nov 30, 2021Observed: 4 ft at 8:00AM Nov 30, 2021Observed: 4.1 ft at 10:00AM Nov 30, 2021Observed: 4.07 ft at 12:00PM Nov 30, 2021Observed: 4.02 ft at 2:00PM Nov 30, 2021Observed: 4.05 ft at 4:00PM Nov 30, 2021Observed: 4.04 ft at 6:00PM Nov 30, 2021Observed: 4.02 ft at 8:00PM Nov 30, 2021Observed: 3.91 ft at 10:00PM Nov 30, 2021Observed: 4.02 ft at 12:00AM Dec 01, 2021Observed: 4.03 ft at 2:00AM Dec 01, 2021Observed: 4.08 ft at 4:00AM Dec 01, 2021Observed: 4.05 ft at 6:00AM Dec 01, 2021Observed: 3.82 ft at 8:00AM Dec 01, 2021Observed: 3.86 ft at 10:00AM Dec 01, 2021Observed: 3.88 ft at 12:00PM Dec 01, 2021Observed: 3.84 ft at 2:00PM Dec 01, 2021Observed: 3.82 ft at 4:00PM Dec 01, 2021Observed: 3.82 ft at 6:00PM Dec 01, 2021Observed: 3.79 ft at 8:00PM Dec 01, 2021Observed: 3.74 ft at 10:00PM Dec 01, 2021Observed: 3.77 ft at 12:00AM Dec 02, 2021Observed: 3.76 ft at 2:00AM Dec 02, 2021Observed: 3.74 ft at 4:00AM Dec 02, 2021Observed: 3.73 ft at 6:00AM Dec 02, 2021Observed: 3.69 ft at 8:00AM Dec 02, 2021Observed: 3.67 ft at 10:00AM Dec 02, 2021Observed: 3.67 ft at 12:00PM Dec 02, 2021Observed: 3.68 ft at 2:00PM Dec 02, 2021Observed: 3.82 ft at 4:00PM Dec 02, 2021Observed: 3.8 ft at 6:00PM Dec 02, 2021Observed: 3.72 ft at 8:00PM Dec 02, 2021Observed: 3.74 ft at 10:00PM Dec 02, 2021Observed: 3.79 ft at 12:00AM Dec 03, 2021Observed: 3.77 ft at 2:00AM Dec 03, 2021Observed: 3.82 ft at 4:00AM Dec 03, 2021Observed: 3.86 ft at 6:00AM Dec 03, 2021Observed: 3.89 ft at 8:00AM Dec 03, 2021Observed: 3.91 ft at 10:00AM Dec 03, 2021Observed: 4.01 ft at 12:00PM Dec 03, 2021Observed: 4.06 ft at 2:00PM Dec 03, 2021Observed: 4.06 ft at 4:00PM Dec 03, 2021Observed: 4.14 ft at 6:00PM Dec 03, 2021Observed: 4.2 ft at 8:00PM Dec 03, 2021Observed: 4.22 ft at 10:00PM Dec 03, 2021Observed: 4.28 ft at 12:00AM Dec 04, 2021Observed: 4.29 ft at 2:00AM Dec 04, 2021Highest Observation: 4.34 ft at 4:00AM Dec 04, 2021Highest Forecast: 4 ft 6:00AM Dec 04, 2021Highest Forecast: 4 ft 12:00PM Dec 04, 2021Forecast: 3.9 ft 6:00PM Dec 04, 2021Forecast: 3.9 ft 12:00AM Dec 05, 2021Forecast: 3.8 ft 6:00AM Dec 05, 2021Forecast: 3.8 ft 12:00PM Dec 05, 2021Forecast: 3.7 ft 6:00PM Dec 05, 2021Forecast: 3.7 ft 12:00AM Dec 06, 2021Forecast: 3.6 ft 6:00AM Dec 06, 2021Forecast: 3.6 ft 12:00PM Dec 06, 2021Forecast: 3.6 ft 6:00PM Dec 06, 2021Forecast: 3.6 ft 12:00AM Dec 07, 2021Forecast: 3.6 ft 6:00AM Dec 07, 2021Forecast: 3.6 ft 12:00PM Dec 07, 2021Forecast: 3.6 ft 6:00PM Dec 07, 2021Forecast: 3.6 ft 12:00AM Dec 08, 2021Forecast: 3.6 ft 6:00AM Dec 08, 2021Forecast: 3.6 ft 12:00PM Dec 08, 2021Forecast: 3.5 ft 6:00PM Dec 08, 2021Forecast: 3.5 ft 12:00AM Dec 09, 2021Forecast: 3.5 ft 6:00AM Dec 09, 2021Forecast: 3.5 ft 12:00PM Dec 09, 2021Forecast: 3.5 ft 6:00PM Dec 09, 2021Forecast: 3.5 ft 12:00AM Dec 10, 2021Forecast: 3.5 ft 6:00AM Dec 10, 2021Forecast: 3.5 ft 12:00PM Dec 10, 2021Forecast: 3.5 ft 6:00PM Dec 10, 2021Forecast: 3.5 ft 12:00AM Dec 11, 2021Forecast: 3.5 ft 6:00AM Dec 11, 2021Forecast: 3.4 ft 12:00PM Dec 11, 2021Forecast: 3.4 ft 6:00PM Dec 11, 2021Forecast: 3.4 ft 12:00AM Dec 12, 2021Forecast: 3.4 ft 6:00AM Dec 12, 2021Forecast: 3.4 ft 12:00PM Dec 12, 2021Forecast: 3.4 ft 6:00PM Dec 12, 2021Forecast: 3.4 ft 12:00AM Dec 13, 2021Forecast: 3.4 ft 6:00AM Dec 13, 2021Forecast: 3.4 ft 12:00PM Dec 13, 2021Forecast: 3.4 ft 6:00PM Dec 13, 2021Forecast: 3.4 ft 12:00AM Dec 14, 2021Forecast: 3.3 ft 6:00AM Dec 14, 2021Forecast: 3.3 ft 12:00PM Dec 14, 2021Forecast: 3.3 ft 6:00PM Dec 14, 2021Forecast: 3.3 ft 12:00AM Dec 15, 2021Forecast: 3.3 ft 6:00AM Dec 15, 2021Forecast: 3.3 ft 12:00PM Dec 15, 2021Forecast: 3.3 ft 6:00PM Dec 15, 2021Forecast: 3.3 ft 12:00AM Dec 16, 2021Forecast: 3.3 ft 6:00AM Dec 16, 2021Forecast: 3.3 ft 12:00PM Dec 16, 2021Forecast: 3.3 ft 6:00PM Dec 16, 2021Forecast: 3.2 ft 12:00AM Dec 17, 2021Forecast: 3.2 ft 6:00AM Dec 17, 2021QLDI2(plotting HTIRZ) Graph Created (5:39AM Dec 4, 2021)ObservedForecast (issued 9:09AM Dec 3)Latest observed value: 4.34 ft at 4:00 AM CST 4-Dec-2021. Flood Stage is 18 ft
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About this graph
Tabular Data (UTC)
Tabular Data (CST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: River forecasts for this location take into account past precipitation and the precipitation amounts expected approximately 48 hours into the future from the forecast issuance time.

NOTE: For the latest navigation status update from the U.S. Army Corps of Engineers-St. Louis District, click here.

NOTE: Forecasts for the Mississippi River at Quincy Lock and Dam 21 are issued routinely year-round.

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Upstream Gauge - at Quincy Upstream Gauge Downstream Gauge Downstream Gauge - at Hannibal
Flood Categories (in feet)
Major Flood Stage: 25
Moderate Flood Stage: 21
Flood Stage: 18
Action Stage: 16
Low Stage (in feet): -9999

Historic Crests
(1) 31.30 ft on 07/13/1993
(2) 30.15 ft on 06/01/2019
(3) 29.58 ft on 06/18/2008
(4) 27.70 ft on 04/25/1973
(5) 27.24 ft on 04/21/2013
(6) 26.55 ft on 05/16/2001
(7) 26.15 ft on 07/08/2014
(8) 24.86 ft on 10/04/1986
(9) 24.74 ft on 06/01/2013
(10) 24.05 ft on 05/29/1996
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 18.86 ft on 04/02/2020
(2) 19.16 ft on 10/17/2019
(3) 17.29 ft on 10/02/2019
(4) 30.15 ft on 06/01/2019
(5) 23.96 ft on 10/12/2018
(6) 19.62 ft on 09/09/2018
(7) 18.47 ft on 07/05/2018
(8) 18.90 ft on 05/16/2018
(9) 18.52 ft on 06/03/2017
(10) 19.33 ft on 05/02/2017
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) -3.40 ft on 12/14/1936
(2) -3.00 ft on 12/26/1933
(3) -2.30 ft on 12/10/1910
(4) -2.20 ft on 01/17/1938
(5) -1.60 ft on 12/18/1922
Show More Low Water Records

For more information on your flood risk go to www.floodsmart.gov.

Zoom Level:14
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Gauge LocationGauge Map Marker
Disclaimer
Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
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.
Photos
(1) Quincy Lock and Dam 21 pool on 19 June 2008 with a pool reading of 27.48 ft.
(2) Quincy Lock and Dam 21 lock house on 19 June 2008 at a tailwater of 26.59 ft.
(3) Quincy Lock and Dam pool gages on 19 June 2008 (HP=27.48, HT=26.59)
(4) Quincy Lock debris in pool on 19 June 2008 (HP=27.48, HT=26.59)
(5) Quincy Lock and Dam 21 pool on 19 June 2008 (HT=26.59 ft., HP=27.48 ft.)
(6) Cropland flooding west of Illinois Highway 57 on June 25, 2010 at a stage of 21.06 ft.
(7) Aerial View
(8) Upstream View looking north toward Quincy
(9) Pool View looking west toward Missouri
(10) Downstream View
(11) Tailwater Overview looking northwest
(12) Tailwater View looking west toward Missouri
About This Location Collapse

Latitude: 39.903889° N, Longitude: 91.429167° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 18 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
Elevation
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other 457.8 ft 474.8 ft Datum of 1912
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How low could the river get?
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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
St. Louis Weather Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304
(636) 441-8467
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Page last modified: 2-Nov-2020 7:29 PM
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