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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)    2010-10-01  2024-11-21  
 Daily Data
    Temperature, water, degrees Celsius  2006-09-22  2024-11-21  19046 
    Discharge, cubic feet per second  2003-09-29  2024-11-20  7723 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09-30  2024-11-20  18674 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2024-11-21  15831 
    pH, water, unfiltered, field, standard units  2012-10-11  2024-11-21  12937 
    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  6276 
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2021-01-05  2024-11-20  3959 
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2012-10-19  2024-11-20  11163 
 Daily Statistics 
    Temperature, water, degrees Celsius  2006-09-22  2021-03-21 3772 
    Discharge, cubic feet per second  2003-09-29  2024-08-22 7634 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09-30  2021-03-21 3693 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2021-03-21 2981 
    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  2021-03  
    Discharge, cubic feet per second  2003-09  2024-08  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09  2021-03  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10  2021-03  
    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  2021  
    Discharge, cubic feet per second  2003  2024  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006  2021  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2013  2021  
    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  2022-12-23  89 
 Field measurements 1935-02-12  2024-10-15  794 
 Field/Lab water-quality samples 1945-04-03  2024-03-07  312 
 Water-Year Summary 2006  2023  18 
 Revisions  Loading...
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