Water Quality Parameters (Nitrate,Turbidity, Dissolved Oxygen, Specific Conductance, pH, Water Temperature, and Chlorophyll) will be discontinued on Nov. 2, 2026, due to lack of cooperative funding agreement for continued operation. The previous funding partner has made the USGS aware that funding will not be provided for further operation. If you are a data user interested in providing funding for continued water quality data collection, please contact Jon Lageman (jlageman@usgs.gov)

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Available data

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Continuous data

7 data types available - data from 2021-05-06 to 2026-10-13

Daily data

8 data types available - data from 1878-01-01 to 2026-10-13

Field measurements

2 data types available - data from 1934-06-28 to 2026-07-29

Discrete sample data

447 Observed properties (data types) available - data from 1944-07-01 to 2026-07-29

320 Sampling activities

Peak measurements

2 data types available - data from 1851-06-06 to 2024-07-11

Statistical tables for select daily data types

7 data types available - data from 1878-01-01 to 2026-10-13

Location details and information

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Operated in cooperation with:

Ameren Missouri

Missouri Department of Natural Resources

USGS - Cooperative Matching Funds

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Location identification number	05474500	n/a
Location name	Mississippi River at Keokuk, IA	n/a
Site type	Stream	ST
Decimal latitude (WGS84)	40.3936553481252	n/a
Decimal longitude (WGS84)	-91.3743179848803	n/a
Latitude-longitude method	Interpolated from map	M
Latitude-longitude accuracy	Accurate to + or - 5 sec.	F
District	Iowa	19
State	Iowa	19
County	Lee County	111
Country	United States of America	n/a
Altitude of gage/land surface	477.41 feet	n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	0.01 feet	n/a
Altitude datum	National Geodetic Vertical Datum of 1929	NGVD29
Subbasin hydrologic unit	Flint-Henderson	07080104
Drainage basin		n/a
Date of first construction		n/a
Drainage area	119000 square miles	n/a
Contributing drainage area		n/a
Time zone abbreviation	CST	n/a
Site honors Daylight Saving Time	Y	n/a
National aquifer		n/a
Local aquifer		n/a
Local aquifer type		n/a
Well depth		n/a
Hole depth		n/a
Source of depth data		n/a

Monitoring location Mississippi River at Keokuk, IA - USGS-05474500