Mississippi River at Keokuk, IA - 05474500

Water quality data collection (Turbidity, Dissolved Oxygen, Specific Conductance, pH, and Chlorophyll) will be discontinued on Sept. 30, 2025, due to loss of project funding. If you have an interest in continuance and/or support of data collection at this site, please contact the Central Midwest Water Science Center, Gary Johnson (email: gjohnson@usgs.gov).

Important Legacy real-time page

Location details and information

Metadata Element	Location Metadata	Metadata Code
Agency	U.S. Geological Survey	USGS
Site identification number	05474500	_n/a
Site name	Mississippi River at Keokuk, IA	_n/a
Site type	Stream	ST
DMS latitude	402337	_n/a
DMS longitude	0912227	_n/a
Decimal latitude	40.39365535	_n/a
Decimal longitude	-91.374318	_n/a
Latitude-longitude method	Interpolated from MAP.	M
Latitude-longitude accuracy	Accurate to + or - 5 sec.	F
Latitude-longitude datum	North American Datum of 1927	NAD27
Decimal Latitude-longitude datum	North American Datum of 1983	NAD83
District	Iowa	19
State	Iowa	19
County	Lee County	111
Country	US	_n/a
Land net location description	SESW S30 T065N R04W 5	_n/a
Name of location map	HAMILTON	_n/a
Scale of location map	24000	_n/a
Altitude of Gage/land surface	477.41 feet	_n/a
Method altitude determined	Level or other surveyed method.	L
Altitude accuracy	.01 feet	_n/a
Altitude datum	National Geodetic Vertical Datum of 1929	NGVD29
Subbasin hydrologic unit	Flint-Henderson	07080104
Drainage basin		_n/a
Topographic setting	Stream channel	C
Flags for instruments at site	NNNNNNNNNNNNNNNNNNNNNNNNNNNNNN	_n/a
Date of first construction		_n/a
Date site established or inventoried	187801	_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
Data reliability		_n/a
Data-other GW files	YNNNNNNN	_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
Project number	461900100	_n/a

Operated in cooperation with:

Ameren Missouri

Missouri Department of Natural Resources

USGS - Cooperative Matching Funds