USGS Home
Contact USGS
Search USGS

National Water Information System: Web Interface

USGS Water Resources   

Data Category:
Home Current Conditions Site Information Mapper Surface Water Groundwater Water Quality Water Use Revisions Geographic Area:
United States Alabama Alaska American Samoa Arizona Arkansas British Columbia California Canton and Enderbury Islands Colorado Connecticut Delaware Dist. of Columbia Florida Georgia Guam Hawaii Idaho Illinois Indiana Iowa Johnston Atoll Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Midway Islands Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Northern Mariana Islands Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island Ryukyu Islands, Southern South Carolina South Dakota Swan Islands Tennessee Texas Trust Territories, Pacific Is U.S.Misc Caribbean Islands U.S.Misc Pacific Islands Utah Vermont Virgin Islands Virginia Wake Island Washington West Virginia Wisconsin Wyoming

Page Loading - Please Wait...

This page will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline.

DESCRIPTION:

Latitude 38°48'46",   Longitude 77°13'43"   NAD27

Fairfax County, Virginia, Hydrologic Unit 02070010

Drainage area: 23.9 square miles

Datum of gage: 190.6 feet above   NAVD88.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations     (availability statement)	1990-10-01	2026-01-23
Daily Data
Temperature, water, degrees Celsius	2002-01-17	2026-01-22	10793
Discharge, cubic feet per second	1947-10-01	2026-01-22	28604
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	2002-01-17	2026-01-22	10675
Dissolved oxygen, water, unfiltered, milligrams per liter	2015-02-05	2026-01-22	11699
pH, water, unfiltered, field, standard units	2015-02-05	2026-01-22	11612
Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)	2023-01-24	2026-01-22	3175
Nitrate plus nitrite, water, in situ, milligrams per liter as nitrogen	2015-10-08	2026-01-22	9537
Daily Statistics
Discharge, cubic feet per second	1947-10-01	2025-08-19	28448
Monthly Statistics
Discharge, cubic feet per second	1947-10	2025-08
Annual Statistics
Discharge, cubic feet per second	1948	2025
Peak streamflow	1947-06-08	2023-07-05	77
Field measurements	1943-11-25	2025-11-19	748
Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP)	1952-11-21	2024-03-07	530
Water-Year Summary	2006	2024	19
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