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Mississippi River at Lock and Dam 21 (Quincy,IL)
Stream Name: Mississippi River
Gage Zero: 457.80 Ft. MSL 1912
Flood Stage:17 Ft.
Record High Stage:31.30 Ft.
Longitude: -91.42904167
Latitude: 39.90380833
Flat Pool : 12.20
Flat Tail : 1.70
River Mile: 324.9 miles above the mouth of the Ohio River
Record High Stage Date: 07/13/1993

Drainage Area : 135000.00 Mi2
Location of Gage :

Pool No. 21 extends from Quincy, IL. 18.3 river miles upstream to Canton, MO. Lock and Dam 21 is located 2.1 river miles downstream of the Quincy Highway 24 bridge. Access is via Lock and Dam Road off of Highway 57.

The National Weather Service information is also linked in the Additional Links for this station.

This gage is operated by the US Army Corps of Engineers (Rock Island District).

Latest Data
09/21/2018 14:00 Central
Latest Stage14.12 Ft.
24 Hr. Change-1.21 Ft.
Tomorrow's Forecast
(Issued 09/21/2018 11:39)
13.50 Ft.   Plot Tomorrow's Forecast
Last Year's Stage3.93 Ft.
Today's Historic Normal Stage4.26 Ft.
Today's Historic Max Stage14.44 Ft.
Today's Historic Min Stage2.18 Ft.
Latest Pool Level15.09 Ft.
24 Hr. Change-1.10 Ft.
Last Year's Pool Level12.17 Ft.
Latest Flow172,620 CFS
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Daily Historic Data
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(Yearly Formatted)
Additional Links:
View Record Stage High / Lows
Flow Calculator for L&D 21
Vessels Queued at Lock 21
Historic Flood Profiles (Pool 21)
Water Transparency
Official National Weather Service information for this station
Real-Time SHEF Report
US Army Corps of Engineers - Rock Island District - Water Control Center - Contact Us