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USGS 05474500 Mississippi River at Keokuk, IA

  Stream Site

DESCRIPTION:
Latitude 40°23'37",   Longitude 91°22'27"   NAD27
Lee County, Iowa, Hydrologic Unit 07080104
Drainage area: 119,000 square miles
Datum of gage: 477.41 feet above   NGVD29.
AVAILABLE DATA:
Data Type Begin Date End Date Count
 Current / Historical Observations     (availability statement)    2021-05-06  2025-10-14  
 Daily Data
    Temperature, water, degrees Celsius  1974-11-04  2022-03-08  2284 
    Temperature, water, degrees Celsius  2021-05-07  2025-10-13  1604 
    Discharge, cubic feet per second  1878-01-01  2025-04-30  53810 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  1974-11-04  1981-09-15  2285 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2021-05-07  2025-10-13  1597 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2021-05-06  2025-10-13  1550 
    pH, water, unfiltered, field, standard units  2021-05-20  2025-10-13  1471 
    Chlorophyll fluorescence (fChl), water, in situ, concentration estimated from reference material, micrograms per liter as chlorophyll  2021-05-07  2025-10-13  1591 
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2021-05-07  2025-10-13  1370 
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2023-04-13  2025-10-13  872 
 Daily Statistics 
    Temperature, water, degrees Celsius  2021-05-07  2025-08-05 1535 
    Discharge, cubic feet per second  1878-01-01  2025-04-29 53809 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2021-05-07  2025-06-11 1474 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2021-05-06  2024-12-09 1264 
    Chlorophyll fluorescence (fChl), water, in situ, concentration estimated from reference material, micrograms per liter as chlorophyll  2021-05-07  2023-10-04 866 
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2021-05-07  2025-05-17 1267 
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2023-04-13  2025-06-11 749 
 Monthly Statistics 
    Temperature, water, degrees Celsius  2021-05  2025-08  
    Discharge, cubic feet per second  1878-01  2025-04  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2021-05  2025-06  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2021-05  2024-12  
    Chlorophyll fluorescence (fChl), water, in situ, concentration estimated from reference material, micrograms per liter as chlorophyll  2021-05  2023-10  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2021-05  2025-05  
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2023-04  2025-06  
 Annual Statistics 
    Temperature, water, degrees Celsius  2021  2025  
    Discharge, cubic feet per second  1878  2025  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2021  2025  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2021  2025  
    Chlorophyll fluorescence (fChl), water, in situ, concentration estimated from reference material, micrograms per liter as chlorophyll  2021  2024  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2021  2025  
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2023  2025  
 Peak streamflow 1851-06-06  2024-07-11  148 
 Field measurements 1934-06-28  2025-09-23  271 
 Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP) 1944-07-01  2021-05-20  248 
 Water-Year Summary 2006  2024  19 
 Revisions  Loading...
OPERATION:
Record for this site is maintained by the USGS Iowa Water Science Center
Email questions about this site to Iowa Water Science Center Water-Data Inquiries