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New WQX 3.0 profiles are available at waterqualitydata.us/beta/. These profiles will contain recent USGS data added since March 11, 2024, which marks the beginning of limited accessibility for USGS data. Read more about the 3.0 profiles and associated changes here.

This legacy user interface will continue to function for several weeks. However, this user interface only serves WQX2.2 profiles, which do NOT contain USGS data added after March 11, 2024.

WQP Home >  Providers >  STORET >  IL_EPA_WQX >  IL_EPA_WQX-RGF-3

Opeka (IL_EPA_WQX-RGF-3) site data in the Water Quality Portal

Data Provider: STORET (Learn more about Water Quality Portal Data Providers)

This lake site, maintained by the illinois epa (identifier IL_EPA_WQX), has the name "Opeka" and has the identifier IL_EPA_WQX-RGF-3. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)07120004.

This site is located in Cook County County, Illinois at 42.0144480000 degrees latitude and -87.8966710000 degrees longitude using the datum NAD27. No horizontal location accuracy metadata is available.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "IL_EPA_WQX-RGF-3" into the "Site ID" box under Site Parameters

What other monitoring locations are upstream or downstream from this one?

Upstream and downstream locations

This map shows all Water Quality Portal stations that are 10 miles upstream (dashed dark blue) and 10 miles downstream (solid light blue) of this monitoring location (indicated by the large blue circle). The upstream and downstream functionality is provided by the Network Linked Data Index.

When were data collected at this location?

Periods of record for data characteristic groups

For a more detailed breakdown of data, go to the Monitoring Report at the EPA How's My Waterway Application
Characteristic Group Date Range*
Biological, Algae, Cyanobacteria 2006 - 2020
Biological, Algae, Phytoplankton, Photosynthetic Pigments 2006 - 2020
Biological, Photosynthetic Pigments 2006 - 2020
Information 2006 - 2006
Inorganics, Major, Metals 2006 - 2006
Inorganics, Minor, Metals 2006 - 2006
Inorganics, Minor, Non-metals 2006 - 2006
Nutrient 2006 - 2020
Organics, Other 2006 - 2006
Organics, PCBs 2006 - 2006
Organics, Pesticide 2006 - 2006
Physical 2006 - 2020
*Date ranges may contain gap years

What other information is available for this location?

Detailed Metadata

For the definitions of the metadata elements, please go to the Water Quality Portal user guide

Location Metadata Value
OrganizationIdentifier IL_EPA_WQX
OrganizationFormalName illinois epa
MonitoringLocationIdentifier IL_EPA_WQX-RGF-3
MonitoringLocationName Opeka
MonitoringLocationTypeName Lake
MonitoringLocationDescriptionText 600 FT SE NE END
HUCEightDigitCode 07120004
LatitudeMeasure 42.0144480000
LongitudeMeasure -87.8966710000
SourceMapScaleNumeric 24000
HorizontalCollectionMethodName Interpolation-Map
HorizontalCoordinateReferenceSystemDatumName NAD27
CountryCode US
StateCode 17
CountyCode 031
ProviderName STORET