Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

Click to hideNews Bulletins

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  2017-06-27  
 Daily Data
    Temperature, water, degrees Celsius  2006-09-22  2017-06-26  9692 
    Discharge, cubic feet per second  1935-04-01  2017-06-26  30035 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09-30  2017-06-26  9520 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2017-06-26  6544 
    pH, water, unfiltered, field, standard units  2012-10-11  2017-06-26  5019 
    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  2017-06-26  6128 
    Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen  2012-10-19  2017-06-26  4608 
 Daily Statistics 
    Temperature, water, degrees Celsius  2006-09-22  2017-01-28 2275 
    Discharge, cubic feet per second  1935-04-01  2016-10-18 29787 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09-30  2017-01-28 2233 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10-11  2017-01-28 1488 
    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  2017-01-28 1393 
 Monthly Statistics 
    Temperature, water, degrees Celsius  2006-09  2017-01  
    Discharge, cubic feet per second  1935-04  2016-10  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2006-09  2017-01  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2012-10  2017-01  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2012-10  2017-01  
 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  2017-06-07  745 
 Field/Lab water-quality samples 1945-04-03  2017-06-14  178 
 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