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Streamflow Measurements for the Nation

! Streamflow measurement pages 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 and new pages.

USGS 01645700 DIFFICULT RUN NEAR FAIRFAX, VA
Fairfax County, Virginia
Hydrologic Unit Code 02070008
Latitude  38°52'29", Longitude  77°20'18" NAD27
Drainage area 4.36  square miles
Gage datum 310.00 feet above NGVD29
Output formats
HTML table with channel data
HTML table without channel data
Tab-separated data with channel data
Tab-separated data without channel data
Graph of data
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Meas.
Number		   Date       Time Time
Datum		 Measurement
Used?		   Who Measuring
Agency		 Stream
flow
(ft3/s)		 Gage
Height
(ft)		 GH
Change
(ft)		 Meas.
Duration
(hr)		 Meas.
Rated		   Control Flow
Adjust.
Code 		 Channel
Number		 Channel
Name		 Meas.
type 		 Stream
flow
method 		 Velocity
method 		 Channel
flow
(ft3/s)		 Channel
width
(ft)		 Channel
area
(ft2)		 Channel
vel.
(ft/s)		 Channel
stability 		 Channel
material 		 Channel
evenness 		 Long.
vel.
desc. 		 Horz.
vel.
desc. 		 Vert.
vel.
desc. 		 Channel
loc.
code 		 Channel
loc.
dist.(ft)
201956-03-28 09:30ESTYesCWLUSGS2.391.31 Good NONE1Imported Channel 1UNSPQSCMMunkno2.3910.04.000.60UNSPUNSPUNSPunknUNSPUNSPUNSP
191955-03-06 18:10ESTYesEHOUSGS37.42.11 Good NONE1Imported Channel 1UNSPQSCMMunkno37.416.018.62.01UNSPUNSPUNSPunknUNSPUNSPUNSP
181953-09-06 16:50ESTYesEHO/JRHUSGS0.870.96 Good NONE1Imported Channel 1UNSPQSCMMunkno0.873.501.210.72UNSPUNSPUNSPunknUNSPUNSPUNSP
171953-04-29 10:15ESTYesEHOUSGS4.661.17 Good NONE1Imported Channel 1UNSPQSCMMunkno4.6610.44.131.13UNSPUNSPUNSPunknUNSPUNSPUNSP
161953-01-22 14:05ESTYesRHTUSGS5.371.50 Fair NONE1Imported Channel 1UNSPQSCMMunkno5.3711.56.900.78UNSPUNSPUNSPunknUNSPUNSPUNSP
15B1952-11-21 -- ----YesEHO/RHTUSGS4795.90 Unspecified NONE1Imported Channel 1OTHRQIDIR 479 UNSPUNSPUNSPunknUNSPUNSPUNSP
15A1952-09-01 -- ----YesEHO/RHTUSGS7837.40 Unspecified NONE1Imported Channel 1OTHRQIDIR 783 UNSPUNSPUNSPunknUNSPUNSPUNSP
151951-10-17 12:25ESTYesARGUSGS0.830.99 Good NONE1Imported Channel 1UNSPQSCMMunkno0.834.101.300.64UNSPUNSPUNSPunknUNSPUNSPUNSP
141940-07-30 18:10ESTYesCAS/PMSUSGS0.092.21 Unspecified NONE1Imported Channel 1UNSPQSCMMunkno0.092.500.230.40UNSPUNSPUNSPunknUNSPUNSPUNSP
131939-11-01 -- ----YesARG/JFHUSGS0.372.43 Unspecified NONE1Imported Channel 1OTHRQVOLM 0.37 UNSPUNSPUNSPunknUNSPUNSPUNSP
121939-05-11 -- ----YesJJDUSGS0.612.54 Unspecified NONE1Imported Channel 1OTHRQVOLM 0.61 UNSPUNSPUNSPunknUNSPUNSPUNSP
111939-03-10 14:10ESTYesJJDUSGS0.992.66 Unspecified NONE1Imported Channel 1UNSPQSCMMunkno0.994.501.450.68UNSPUNSPUNSPunknUNSPUNSPUNSP
101938-09-28 -- ----YesJJDUSGS0.172.33 Unspecified NONE1Imported Channel 1OTHRQVOLM 0.17 UNSPUNSPUNSPunknUNSPUNSPUNSP
91938-09-15 15:10ESTYesTWE/ODMUSGS0.112.31 Unspecified NONE1Imported Channel 1UNSPQSCMMunkno0.112.600.350.31UNSPUNSPUNSPunknUNSPUNSPUNSP
81938-06-09 14:40ESTYesARGUSGS0.342.42 FairClearNONE1Imported Channel 1UNSPQSCMMunkno0.343.900.780.44UNSPUNSPUNSPunknUNSPUNSPUNSP
71937-12-23 16:30ESTYesARG/JFHUSGS0.982.60 Unspecified NONE1Imported Channel 1UNSPQSCMMunkno0.986.502.900.34UNSPUNSPUNSPunknUNSPUNSPUNSP
61937-07-06 16:30ESTYesJFHUSGS0.602.49 Unspecified NONE1Imported Channel 1UNSPQSCMMunkno0.603.000.800.75UNSPUNSPUNSPunknUNSPUNSPUNSP
51937-01-16 10:50ESTYesODM/TWEUSGS1.232.73 Unspecified NONE1Imported Channel 1UNSPQSCMMunkno1.236.002.070.59UNSPUNSPUNSPunknUNSPUNSPUNSP
41935-10-17 08:45ESTYesARG/EAGUSGS0.242.37 Unspecified NONE1Imported Channel 1OTHRQVOLM 0.24 UNSPUNSPUNSPunknUNSPUNSPUNSP
31935-09-19 09:00ESTYesODM/EAGUSGS0.362.44 Unspecified NONE1Imported Channel 1OTHRQVOLM 0.36 UNSPUNSPUNSPunknUNSPUNSPUNSP
21935-07-10 09:30ESTYesARG/CASUSGS0.372.45 Unspecified NONE1Imported Channel 1OTHRQVOLM 0.37 UNSPUNSPUNSPunknUNSPUNSPUNSP
11935-06-04 16:15ESTYesADA/CASUSGS0.602.56 Unspecified NONE1Imported Channel 1UNSPQSCMMunkno0.605.802.000.30UNSPUNSPUNSPunknUNSPUNSPUNSP