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USGS 01646000 DIFFICULT RUN NEAR GREAT FALLS, VA

  Stream Site

DESCRIPTION:
Latitude 38°58'33",   Longitude 77°14'46"   NAD27
Fairfax County, Virginia, Hydrologic Unit 02070008
Drainage area: 57.8 square miles
Datum of gage: 150.94 feet above   NAVD88.
AVAILABLE DATA:
Data Type Begin Date End Date Count
 Current / Historical Observations     (availability statement)    2007-10-01  2017-02-24  
 Daily Data
    Temperature, water, degrees Celsius  2006-09-22  2017-02-23  9204 
    Discharge, cubic feet per second  1935-04-01  2017-02-23  29914 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-10-01  2017-02-23  9032 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2017-02-23  6056 
    pH, water, unfiltered, field, standard units  2012-10-11  2017-02-23  4653 
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2012-10-12  2017-02-23  5676 
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2012-10-19  2017-02-23  4248 
 Daily Statistics 
    Temperature, water, degrees Celsius  2006-09-22  2016-10-24 2182 
    Discharge, cubic feet per second  1935-04-01  2016-10-19 29788 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-10-01  2016-10-24 2140 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2016-10-24 1395 
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2012-10-12  2016-10-24 1307 
 Monthly Statistics 
    Temperature, water, degrees Celsius  2006-09  2016-10  
    Discharge, cubic feet per second  1935-04  2016-10  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-10  2016-10  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10  2016-10  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2012-10  2016-10  
 Annual Statistics 
    Temperature, water, degrees Celsius  2006  2017  
    Discharge, cubic feet per second  1935  2017  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2007  2017  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2013  2017  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2013  2017  
 Peak streamflow 1935-09-06  2016-05-03  82 
 Field measurements 1935-02-12  2017-02-08  750 
 Field/Lab water-quality samples 1945-04-03  2017-02-15  170 
 Water-Year Summary 2006  2016  11 

Additional Data Sources

Begin Date

End Date

Count
 Instantaneous-Data Archive  **offsite** 1990-10-01  2007-09-30  334800 
OPERATION:
Record for this site is maintained by the USGS Virginia Water Science Center
Email questions about this site to Virginia Water Science Center Water-Data Inquiries