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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-MT >  USGS-12300110

Lake Koocanusa at international boundary (USGS-12300110) 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 Montana Water Science Center (identifier USGS-MT), has the name "Lake Koocanusa at international boundary" and has the identifier USGS-12300110. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)17010101. See more details of this site the the USGS NWIS Web page for this site.

This site is located in Lincoln County County, Montana at 48.98963056000000 degrees latitude and -115.1809694000000 degrees longitude using the datum NAD83. The horizontal location collection method was "Mapping grade GPS unit (handheld accuracy range 12 to 40 ft)" and the accuracy is .5 seconds. The source map scale is 1:24000. This site is at an elevation of 2463 feet and the accuracy of the elevation measurement, collected using the method "Interpolated from Digital Elevation Model" is 25 feet. The vertical coordinate reference system is NAVD88.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "USGS-12300110" 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 2003 - 2023
Biological, Algae, Phytoplankton 1974 - 2023
Biological, Algae, Phytoplankton, Photosynthetic Pigments 1974 - 2023
Biological, Counts 1980 - 1980
Biological, Photosynthetic Pigments 1974 - 1982
Information 1972 - 2022
Inorganics, Major, Metals 1974 - 2023
Inorganics, Major, Non-metals 1972 - 2023
Inorganics, Minor, Metals 1972 - 2023
Inorganics, Minor, Non-metals 1972 - 2023
Microbiological 1972 - 1974
Nutrient 1972 - 2023
Organics, Other 1974 - 2023
Organics, PCBs 1972 - 1974
Organics, Pesticide 1972 - 2022
Physical 1972 - 2023
Radiochemical 1972 - 2023
*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-MT
OrganizationFormalName USGS Montana Water Science Center
MonitoringLocationIdentifier USGS-12300110
MonitoringLocationName Lake Koocanusa at international boundary
MonitoringLocationTypeName Lake, Reservoir, Impoundment
HUCEightDigitCode 17010101
LatitudeMeasure 48.98963056000000
LongitudeMeasure -115.1809694000000
SourceMapScaleNumeric 24000
HorizontalAccuracyMeasure/MeasureValue .5
HorizontalAccuracyMeasure/MeasureUnitCode seconds
HorizontalCollectionMethodName Mapping grade GPS unit (handheld accuracy range 12 to 40 ft)
HorizontalCoordinateReferenceSystemDatumName NAD83
VerticalMeasure/MeasureValue 2463
VerticalMeasure/MeasureUnitCode feet
VerticalAccuracyMeasure/MeasureValue 25
VerticalAccuracyMeasure/MeasureUnitCode feet
VerticalCollectionMethodName Interpolated from Digital Elevation Model
VerticalCoordinateReferenceSystemDatumName NAVD88
CountryCode US
StateCode 30
CountyCode 053
ProviderName NWIS