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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)    2003-10-01  2017-11-20  
 Daily Data
    Temperature, water, degrees Celsius  2006-09-22  2017-11-19  10264 
    Discharge, cubic feet per second  1935-04-01  2017-11-19  30184 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09-30  2017-11-19  10076 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2017-11-19  7116 
    pH, water, unfiltered, field, standard units  2012-10-11  2017-11-19  5445 
    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  2017-08-09  6280 
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2012-10-19  2017-11-19  5034 
 Daily Statistics 
    Temperature, water, degrees Celsius  2006-09-22  2017-08-29 2481 
    Discharge, cubic feet per second  1935-04-01  2017-07-31 30073 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09-30  2017-08-09 2417 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2017-08-09 1677 
    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  2017-08-09 1569 
 Monthly Statistics 
    Temperature, water, degrees Celsius  2006-09  2017-08  
    Discharge, cubic feet per second  1935-04  2017-07  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09  2017-08  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10  2017-08  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2012-10  2017-08  
 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  2006  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  2017-10-25  748 
 Field/Lab water-quality samples 1945-04-03  2017-10-30  185 
 Water-Year Summary 2006  2016  11 
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