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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 >  CALWR_WQX >  CALWR_WQX-B9D74761310

OLD/MIDDLE RIVER (CALWR_WQX-B9D74761310) site data in the Water Quality Portal

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

This other-surface water site, maintained by the California Department Of Water Resources (identifier CALWR_WQX), has the name "OLD/MIDDLE RIVER" and has the identifier CALWR_WQX-B9D74761310. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)18040003.

This site is located in San Joaquin County County, California at 37.7936111000 degrees latitude and -121.5163888900 degrees longitude using the datum OTHER. The horizontal location collection method was "Unknown" and the accuracy is 1 ft.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "CALWR_WQX-B9D74761310" 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*
Inorganics, Major, Metals 1999 - 1999
Inorganics, Major, Non-metals 1999 - 1999
Inorganics, Minor, Metals 1999 - 1999
Inorganics, Minor, Non-metals 1999 - 1999
Not Assigned 1999 - 1999
Organics, Other 1999 - 1999
Organics, PCBs 1999 - 1999
Organics, Pesticide 1999 - 1999
Physical 1999 - 1999
*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 CALWR_WQX
OrganizationFormalName California Department Of Water Resources
MonitoringLocationIdentifier CALWR_WQX-B9D74761310
MonitoringLocationName OLD/MIDDLE RIVER
MonitoringLocationTypeName Other-Surface Water
HUCEightDigitCode 18040003
LatitudeMeasure 37.7936111000
LongitudeMeasure -121.5163888900
HorizontalAccuracyMeasure/MeasureValue 1
HorizontalAccuracyMeasure/MeasureUnitCode ft
HorizontalCollectionMethodName Unknown
HorizontalCoordinateReferenceSystemDatumName OTHER
CountryCode US
StateCode 06
CountyCode 077
ProviderName STORET