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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 user interface only serves WQX2.2 profiles, which do NOT contain USGS data added after March 11, 2024.

WQP Home >  Providers >  STORET >  21VASWCB >  21VASWCB-1AFOU000.19

G. W. PARKWAY BRIDGE (21VASWCB-1AFOU000.19) site data in the Water Quality Portal

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

This estuary site, maintained by the VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY (identifier 21VASWCB), has the name "G. W. PARKWAY BRIDGE" and has the identifier 21VASWCB-1AFOU000.19. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)02070010.

This site is located in Alexandria City County, Virginia at 38.8411000000 degrees latitude and -77.0483000000 degrees longitude using the datum NAD83. The horizontal location collection method was "Interpolation-Map" and the accuracy is 100 ft. The source map scale is 1:24000. This site is at an elevation of 0 ft 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 "21VASWCB-1AFOU000.19" 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 2009 - 2025
Biological, Algae, Phytoplankton 2009 - 2025
Biological, Photosynthetic Pigments 2009 - 2025
Information 1982 - 1985
Inorganics, Major, Non-metals 1974 - 2001
Microbiological 2001 - 2025
Nutrient 2001 - 2025
Organics, Other 2005 - 2006
Physical 1974 - 2025
*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 21VASWCB
OrganizationFormalName VIRGINIA DEPARTMENT OF ENVIRONMENTAL QUALITY
MonitoringLocationIdentifier 21VASWCB-1AFOU000.19
MonitoringLocationName G. W. PARKWAY BRIDGE
MonitoringLocationTypeName Estuary
MonitoringLocationDescriptionText Potomac Embayment Station; TMDL station CY06 (BST) - jst
HUCEightDigitCode 02070010
LatitudeMeasure 38.8411000000
LongitudeMeasure -77.0483000000
SourceMapScaleNumeric 24000
HorizontalAccuracyMeasure/MeasureValue 100
HorizontalAccuracyMeasure/MeasureUnitCode ft
HorizontalCollectionMethodName Interpolation-Map
HorizontalCoordinateReferenceSystemDatumName NAD83
VerticalMeasure/MeasureValue 0
VerticalMeasure/MeasureUnitCode ft
VerticalCollectionMethodName Topographic Map Interpolation
VerticalCoordinateReferenceSystemDatumName SEALV
CountryCode US
StateCode 51
CountyCode 510
ProviderName STORET