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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 01397500 Walnut Brook near Flemington NJ
Hunterdon County, New Jersey
Hydrologic Unit Code 02030105
Latitude  40°30'55", Longitude  74°52'51" NAD83
Drainage area 2.24  square miles
Gage datum 267.33 feet above NGVD29
Output formats
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HTML table without channel data
Tab-separated data with channel 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)
1222009-04-03 14:06:30EDTYesarvUSGS1012.270.020.30FairClearNONE1Imported Channel 1WADEQSCMMVADV10136.037.42.72FIRMBLDREVENunknEVENUNSPATGA
1212009-04-03 13:41:30EDTYesarvUSGS85.72.220.090.40PoorClearNONE1Imported Channel 1WADEQSCMMVADV85.736.037.52.29FIRMBLDREVENunknUNEVUNSPATGA
1202007-10-09 12:45EDTYesarvUSGS0.00 Excellent NONE1Imported Channel 1UNSPother 0.00 UNSPUNSPUNSPunknUNSPUNSPUNSP
1192005-01-14 13:35ESTYesarp/pbrUSGS58.82.09-0.120.80FairClearNONE1Imported Channel 1WADEunspeunkno58.847.229.32.01UNSPUNSPUNSPunknUNSPUNSPUNSP
1182003-09-23 09:13EDTYesJCS/TMMUSGS1192.26-0.110.50FairClearNONE1Imported Channel 1WADEunspeunkno11928.551.02.33UNSPUNSPUNSPunknUNSPUNSPUNSP
1172003-02-22 16:36ESTYesJCS/AFWUSGS80.82.29-0.040.30PoorClearNONE1Imported Channel 1WADEunspeunkno80.822.527.62.93UNSPUNSPUNSPunknUNSPUNSPUNSP
1162002-05-14 10:15EDTYesJCSUSGS16.11.78-0.010.40FairClearNONE1Imported Channel 1WADEunspeunkno16.128.126.60.61UNSPUNSPUNSPunknUNSPUNSPUNSP
1151998-09-23 14:24EDTYestjrUSGS0.00 Excellent NONE1Imported Channel 1UNSPother 0.00 UNSPUNSPUNSPunknUNSPUNSPUNSP
1141998-08-05 14:25EDTYestjrUSGS0.00 Excellent NONE1Imported Channel 1UNSPother 0.00 UNSPUNSPUNSPunknUNSPUNSPUNSP
1131997-09-12 16:20EDTYesGLCUSGS1.411.160.000.30FairClearNONE1Imported Channel 1WADEunspeunkno1.417.203.180.44UNSPUNSPUNSPunknUNSPUNSPUNSP
1121997-01-27 16:08ESTYesJFD/WDJUSGS3152.84-0.040.50PoorClearNONE1Imported Channel 1CRANunspeunkno31521.448.36.53UNSPUNSPUNSPunknUNSPUNSPUNSP
1111990-05-30 10:18EDTYesDSKUSGS20.01.710.020.50GoodClearNONE1Imported Channel 1WADEunspeunkno20.019.219.71.04UNSPUNSPUNSPunknUNSPUNSPUNSP
1101986-08-15 -- ----YesRAGUSGS0.701.170.000.50FairClearNONE1Imported Channel 1WADEunspeunkno0.7011.52.600.27UNSPUNSPUNSPunknUNSPUNSPUNSP
1091985-05-03 -- ----YesRSCUSGS23.71.720.020.50GoodClearNONE1Imported Channel 1WADEunspeunkno23.723.021.41.11UNSPUNSPUNSPunknUNSPUNSPUNSP
1081983-04-10 -- ----YesJTFUSGS73.51.92 FairClearNONE1Imported Channel 1WADEunspeunkno73.535.032.02.30UNSPUNSPUNSPunknUNSPUNSPUNSP
1071982-06-14 -- ----YesJTFUSGS7.571.50 GoodClearNONE1Imported Channel 1WADEunspeunkno7.5721.012.30.62UNSPUNSPUNSPunknUNSPUNSPUNSP
1061973-07-31 11:17EDTYesRLWUSGS0.141.100.000.10FairClearNONE1Imported Channel 1WADEunspeunkno0.142.400.520.27UNSPUNSPUNSPunknUNSPUNSPUNSP
1051971-08-28 -- ----YesGMF/SLLUSGS15704.61 Poor NONE1Imported Channel 1OTHRQIDIR 1570 UNSPUNSPUNSPunknUNSPUNSPUNSP
1041969-10-07 14:55ESTYesG DUSGS0.281.12 Unspecified NONE1Imported Channel 1WADEunspeunkno0.284.101.340.21UNSPUNSPUNSPunknUNSPUNSPUNSP
1031961-10-30 14:25ESTYesRSCUSGS0.041.050.000.30Fair NONE1Imported Channel 1WADEunspeunkno0.041.100.150.27UNSPUNSPUNSPunknUNSPUNSPUNSP
1021961-08-17 12:05ESTYesRSCUSGS0.211.120.000.20Good NONE1Imported Channel 1WADEunspeunkno0.211.800.260.82UNSPUNSPUNSPunknUNSPUNSPUNSP
1011961-04-27 15:05ESTYesRSCUSGS3.841.380.000.50Good NONE1Imported Channel 1WADEunspeunkno3.8414.56.260.61UNSPUNSPUNSPunknUNSPUNSPUNSP
1001961-04-13 14:35ESTYesRTMUSGS75.72.060.000.40FairClearNONE1Imported Channel 1WADEunspeunkno75.734.032.42.34UNSPUNSPUNSPunknUNSPUNSPUNSP
991961-04-13 13:55ESTYesRTMUSGS77.22.050.010.30FairClearNONE1Imported Channel 1WADEunspeunkno77.234.033.22.33UNSPUNSPUNSPunknUNSPUNSPUNSP
981961-01-11 15:05ESTYesRSCUSGS2.671.330.000.50Good NONE1Imported Channel 1WADEunspeunkno2.678.504.620.58UNSPUNSPUNSPunknUNSPUNSPUNSP
971960-12-06 13:45ESTYesRSCUSGS1.631.260.000.30Good NONE1Imported Channel 1WADEunspeunkno1.638.003.320.49UNSPUNSPUNSPunknUNSPUNSPUNSP
961960-12-06 13:10ESTYesRSCUSGS1.611.260.000.50Good NONE1Imported Channel 1WADEunspeunkno1.618.003.320.48UNSPUNSPUNSPunknUNSPUNSPUNSP
951960-10-24 14:05ESTYesRSCUSGS1.841.280.000.40Good NONE1Imported Channel 1WADEunspeunkno1.848.003.340.55UNSPUNSPUNSPunknUNSPUNSPUNSP
941960-10-24 11:40ESTYesRSCUSGS1.851.280.000.40Good NONE1Imported Channel 1WADEunspeunkno1.858.003.330.56UNSPUNSPUNSPunknUNSPUNSPUNSP