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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 >  NWIS >  USGS-LA >  USGS-302150090102000

LK PONTCHARTRAIN @ TCHEFUNCTA R NR MADISONVILLE (USGS-302150090102000) site data in the Water Quality Portal

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

This lake, reservoir, impoundment site, maintained by the USGS Louisiana Water Science Center (identifier USGS-LA), has the name "LK PONTCHARTRAIN @ TCHEFUNCTA R NR MADISONVILLE" and has the identifier USGS-302150090102000. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)08090202. See more details of this site the the USGS NWIS Web page for this site.

This site is located in St. Tammany Parish County, Louisiana at 30.36408380000000 degrees latitude and -90.1723012000000 degrees longitude using the datum NAD83. The horizontal location collection method was "Interpolated from MAP." and the accuracy is Unknown Unknown.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "USGS-302150090102000" 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, Phytoplankton, Photosynthetic Pigments 1976 - 1981
Biological, Photosynthetic Pigments 1976 - 1981
Information 1976 - 1981
Inorganics, Major, Metals 1974 - 1981
Inorganics, Major, Non-metals 1974 - 1981
Inorganics, Minor, Metals 1974 - 1981
Inorganics, Minor, Non-metals 1974 - 1981
Microbiological 1974 - 1981
Nutrient 1974 - 1981
Organics, Other 1974 - 1981
Organics, PCBs 1974 - 1981
Organics, Pesticide 1974 - 1981
Physical 1974 - 1981
Radiochemical 1979 - 1981
*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 USGS-LA
OrganizationFormalName USGS Louisiana Water Science Center
MonitoringLocationIdentifier USGS-302150090102000
MonitoringLocationName LK PONTCHARTRAIN @ TCHEFUNCTA R NR MADISONVILLE
MonitoringLocationTypeName Lake, Reservoir, Impoundment
HUCEightDigitCode 08090202
LatitudeMeasure 30.36408380000000
LongitudeMeasure -90.1723012000000
HorizontalAccuracyMeasure/MeasureValue Unknown
HorizontalAccuracyMeasure/MeasureUnitCode Unknown
HorizontalCollectionMethodName Interpolated from MAP.
HorizontalCoordinateReferenceSystemDatumName NAD83
CountryCode US
StateCode 22
CountyCode 103
ProviderName NWIS