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  • January 22, 2018 - USGS Water Data availability during lapse in Federal funding

    Due to a lapse in Federal funding, the U.S. Geological Survey must suspend those parts of its data collection and distribution processes requiring human intervention. However, automated reporting and serving of telemetered data will continue.

    Users may note some degradation in the quality and completeness of real-time streamflow, groundwater and water-quality data from some reporting stations due to the suspension of field calibrations and adjustments, especially as high flows occur, aquatic vegetation becomes dominant, or ice forms in high altitude streams. The USGS will continue to monitor some performance aspects of its network using a skeleton workforce.

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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  2018-01-23  
 Daily Data
    Temperature, water, degrees Celsius  2006-09-22  2018-01-22  10520 
    Discharge, cubic feet per second  1935-04-01  2018-01-22  30238 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09-30  2018-01-22  10332 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2018-01-22  7372 
    pH, water, unfiltered, field, standard units  2012-10-11  2018-01-22  5637 
    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  2018-01-22  5223 
 Daily Statistics 
    Temperature, water, degrees Celsius  2006-09-22  2017-11-27 2574 
    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  2017-11-27 2525 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2017-11-27 1785 
    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  2017-11  
    Discharge, cubic feet per second  1935-04  2017-07  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09  2017-11  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10  2017-11  
    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  2018  
    Discharge, cubic feet per second  1935  2017  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006  2018  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2013  2018  
    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  2017-11-29  749 
 Field/Lab water-quality samples 1945-04-03  2017-12-13  187 
 Water-Year Summary 2006  2017  12 
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