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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 01374963 HALLOCKS MILL BROOK AT AMAWALK NY
Westchester County, New York
Hydrologic Unit Code 02030101
Latitude  41°17'09.2", Longitude  73°45'56.9" NAD83
Drainage area 11.4  square miles
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 
642012-07-31 12:58ESTYesDDEUSGS13.6 FairUnspecifedNONE
632012-05-01 11:00ESTYesDDEUSGS17.0 FairUnspecifedNONE
622012-02-21 12:58:05ESTYesDDEUSGS7.93 FairUnspecifedNONE
612011-12-06 12:26:48ESTYesDDEUSGS20.3 FairUnspecifedNONE
602011-10-13 11:56:17ESTYesDDEUSGS16.9 FairUnspecifedNONE
592011-08-02 10:02ESTYesDDEUSGS2.94 Fair NONE
582011-06-09 08:20ESTYesDDEUSGS7.26 Fair NONE
572011-05-10 -- ----YesDDEUSGS10.5 Fair NONE
562011-04-13 -- ----YesDDEUSGS50.6 Fair NONE
552011-01-19 10:34:56ESTYesJDBUSGS19.0 Good NONE
542010-12-14 15:29:33ESTYesJDBUSGS46.7 Poor NONE
532010-09-14 11:56:04ESTYesJDBUSGS2.55 Fair NONE
522010-06-29 14:44:09ESTYesDDEUSGS4.94 Good NONE
512010-05-19 11:09:48ESTYesDDEUSGS15.8 GoodUnspecifedNONE
502010-04-26 13:11ESTYesJDBUSGS32.6 Fair NONE
492009-08-18 -- ----YesDDEUSGS5.60 FairUnspecifedNONE
482009-06-30 -- ----YesDDEUSGS26.3 FairUnspecifedNONE
472009-04-28 -- ----YesDDEUSGS16.9 FairUnspecifedNONE
462008-12-09 14:57ESTYesDDEUSGS10.4 FairUnspecifedNONE
452008-10-22 -- ----YesDDEUSGS3.22 Good NONE
442008-09-17 -- ----YesddeUSGS12.1 Unspecified NONE
432008-07-14 13:30ESTYesCIMUSGS7.26 Unspecified NONE
422008-05-07 -- ----YesCPTUSGS7.70 Unspecified NONE
412008-03-17 -- ----YesDDEUSGS31.6 Unspecified NONE
402008-01-24 -- ----YesDDEUSGS14.3 Unspecified NONE
392007-12-12 14:35ESTYesDDEUSGS13.4 Fair NONE
382007-09-18 12:53ESTYesDDEUSGS2.12 FairClearNONE
372007-08-28 12:35ESTYesDDEUSGS3.77 Fair NONE
362007-06-19 12:07ESTYesDDEUSGS4.00 FairClearNONE
352007-05-01 11:29ESTYesDDEUSGS23.4 Fair NONE
342007-03-13 13:18ESTYesDDEUSGS30.1 Fair NONE
332007-02-05 13:47ESTYesDDE/SWBUSGS10.9 Fair NONE
322006-11-28 12:54ESTYesDDEUSGS32.3 Good NONE
312006-10-03 13:23ESTYesDDEUSGS5.87 Good NONE
302006-07-10 14:56ESTYesddeUSGS8.20 Unspecified NONE
292006-05-08 14:28ESTYesddeUSGS9.73 Unspecified NONE
282006-03-29 14:01ESTYesddeUSGS8.33 Unspecified NONE
272005-11-07 15:11ESTYesddeUSGS16.3 Unspecified NONE
262005-09-28 13:49ESTYesDDE/JDBUSGS1.83 Fair NONE
252005-08-22 14:27ESTYesDDE/JDBUSGS4.24 Fair NONE
242005-07-12 15:30ESTYesDDE/JDBUSGS7.65 Fair NONE
232005-06-13 15:24ESTYesDDE/JDBUSGS4.60 Fair NONE
222005-05-02 14:25ESTYesDDE/JDBUSGS22.1 Fair NONE
212005-03-21 13:55ESTYesDDE/JDBUSGS25.8 Fair NONE
202005-01-18 14:02ESTYesDDE/JDBUSGS54.0 Fair NONE
192004-12-13 14:23ESTYesDDEUSGS30.9 Fair NONE
182004-09-20 13:03ESTYesDDE/JDBUSGS89.4 Fair NONE
172004-07-19 13:36ESTYesDDE/JDBUSGS2.92 Fair NONE
162004-06-22 13:02ESTYesDDE/JDBUSGS6.00 Fair NONE
152004-05-10 13:39ESTYesDDE/JDBUSGS17.7 Fair NONE
142004-03-23 14:58ESTYesDDEUSGS22.1 Poor NONE
132004-01-12 16:10ESTYesDDE/JDBUSGS15.3 Fair NONE
122003-11-10 14:43ESTYesDDEUSGS21.1 Good NONE
112003-10-20 13:54ESTYesDDEUSGS9.70 Fair NONE
102003-09-10 16:00ESTYesEANUSGS3.24 Fair NONE
92003-08-11 12:06ESTYesDDEUSGS15.2 Good NONE
82003-07-14 17:54ESTYesDDEUSGS4.80 Fair NONE
72003-06-24 10:26ESTYesJDBUSGS28.6 Good NONE
62003-05-20 15:02ESTYesDDEUSGS7.21 Fair NONE
52002-09-04 11:14ESTYesdde/pjpUSGS14.9 Fair NONE
42000-08-10 11:20ESTYesDDEUSGS8.41 Good NONE
32000-07-10 13:13ESTYesGRWUSGS4.70 Fair NONE
21976-07-21 -- ----YesLAWUSGS3.7613.891.00 GoodClearNONE
11976-07-19 -- ----YesLAWUSGS5.0313.92 GoodClearNONE