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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 >  TCEQMAIN >  TCEQMAIN-12440

ONION CK NEAR MCKINNEY FALLS (TCEQMAIN-12440) site data in the Water Quality Portal

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

This river/stream site, maintained by the Texas Commission on Environmental Quality (identifier TCEQMAIN), has the name "ONION CK NEAR MCKINNEY FALLS" and has the identifier TCEQMAIN-12440. This site is in the watershed defined by the 8 digit Hydrologic Unit Code (HUC)12090205.

This site is located in Travis County County, Texas at 30.1885000000 degrees latitude and -97.7209000000 degrees longitude using the datum NAD83. No horizontal location accuracy metadata is available.

To download the metadata about this site along with water quality data, go to the Portal Page and enter "TCEQMAIN-12440" 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 2010 - 2010
Biological, Counts 2010 - 2010
Information 2010 - 2010
Inorganics, Major, Non-metals 2010 - 2020
Microbiological 2011 - 2020
Nutrient 2010 - 2020
Organics, Other 2011 - 2020
Physical 2010 - 2020
*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 TCEQMAIN
OrganizationFormalName Texas Commission on Environmental Quality
MonitoringLocationIdentifier TCEQMAIN-12440
MonitoringLocationName ONION CK NEAR MCKINNEY FALLS
MonitoringLocationTypeName River/Stream
HUCEightDigitCode 12090205
LatitudeMeasure 30.1885000000
LongitudeMeasure -97.7209000000
HorizontalCollectionMethodName Interpolation-Photo
HorizontalCoordinateReferenceSystemDatumName NAD83
CountryCode US
StateCode 48
CountyCode 453
ProviderName STORET