Limited availability of new USGS data; starting March 11th, 2024, there will be a period when new USGS data will not be accessible on the Water Quality Portal. Data will still be collected but will not be publicly available. This limited availability is expected to last a few weeks.
Recent USGS data will be accessible again upon release of the new Data Profiles, which will be in the WQX 3.0 format. These profiles should be available in April, 2024. Please keep an eye on banners on this website for announcements.

WQP Home >  Providers >  STORET >  EPA_GLNPO >  EPA_GLNPO-23M-27M-41

Composite 23M,27M,41 (EPA_GLNPO-23M-27M-41) site data in the Water Quality Portal

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

This great lake site, maintained by the EPA Great Lakes National Program (identifier EPA_GLNPO), has the name "Composite 23M,27M,41" and has the identifier EPA_GLNPO-23M-27M-41.

This site is located in Mason County County, Michigan at 44.0049666327 degrees latitude and -86.8480976531 degrees longitude using the datum UNKWN. The horizontal location collection method was "Interpolation-Map" and the accuracy is 0 m. The source map scale is 1:24000. This site is at an elevation of 176 m No vertical location accuracy metadata is available.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "EPA_GLNPO-23M-27M-41" 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*
Organics, Other 1994 - 1994
Organics, PCBs 1994 - 1994
Organics, Pesticide 1994 - 1994
Physical 1994 - 1994
*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 EPA_GLNPO
OrganizationFormalName EPA Great Lakes National Program
MonitoringLocationIdentifier EPA_GLNPO-23M-27M-41
MonitoringLocationName Composite 23M,27M,41
MonitoringLocationTypeName Great Lake
MonitoringLocationDescriptionText Composite of stations 23M,27M,41
LatitudeMeasure 44.0049666327
LongitudeMeasure -86.8480976531
SourceMapScaleNumeric 24000
HorizontalAccuracyMeasure/MeasureValue 0
HorizontalAccuracyMeasure/MeasureUnitCode m
HorizontalCollectionMethodName Interpolation-Map
HorizontalCoordinateReferenceSystemDatumName UNKWN
VerticalMeasure/MeasureValue 176
VerticalMeasure/MeasureUnitCode m
VerticalCollectionMethodName Unknown
VerticalCoordinateReferenceSystemDatumName UNKWN
CountryCode US
StateCode 26
CountyCode 105
ProviderName STORET