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USGS Daily Statistics for Massachusetts

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ICE EFFECTS ON STREAMFLOW

The formation of ice on rivers can cause discharge values to appear unusually high. Display of these erroneous discharge data may result in improper assessment of flow conditions and misuse of the data. For this reason, display of discharge values for streams significantly affected by ice may be disabled from view. Display of discharge data will resume when ice conditions are no longer present. Discharge values for streams minimally affected by ice will continue to be displayed. Flows for streams with these conditions appear to increase during the night and decrease to near-base-line conditions around midday. To estimate the correct discharge for these streams, use the flow rate that corresponds to the bottom of the discharge curve, rather than the peak that corresponds to the top of the curve. Note that this method of estimation is possible only when no surface runoff is occurring. Daily mean discharges for periods of both significant and minimal ice-effect will be estimated and published in the Annual Water-Data Report for the water year in which they occurred.


The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 01171500 MILL RIVER AT NORTHAMPTON, MA


Hampshire County, Massachusetts
Hydrologic Unit Code 01080201
Latitude  42°19'08", Longitude  72°39'56" NAD27
Drainage area 52.6  square miles
Contributing drainage area 52.6  square miles
Gage datum 169.34 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1938-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 103 85 113 288 168 126 59 37 28 59 70 117
2 103 96 119 296 149 113 52 42 36 51 76 113
3 96 116 116 298 148 106 52 33 27 46 109 102
4 90 112 135 298 153 101 56 35 28 54 78 96
5 91 109 121 323 140 88 51 37 26 49 89 104
6 95 94 134 293 139 132 47 30 30 51 79 109
7 87 96 167 271 127 117 42 37 47 48 79 110
8 92 93 149 241 118 91 41 50 39 52 88 104
9 101 80 175 221 126 82 41 45 34 69 118 105
10 105 80 150 234 134 84 64 54 31 47 87 108
11 97 102 167 225 140 79 46 44 42 45 88 123
12 96 94 163 241 142 79 42 51 48 52 103 134
13 95 90 176 231 136 82 43 50 36 47 95 124
14 100 92 182 224 129 98 54 42 32 55 85 120
15 91 95 186 206 112 87 39 41 37 104 85 114
16 87 105 178 271 117 85 61 34 38 77 81 99
17 80 93 194 235 139 77 44 29 50 81 92 107
18 93 104 191 203 133 66 54 43 53 58 80 139
19 97 100 193 193 134 67 48 79 47 60 71 101
20 95 117 222 197 126 59 42 39 40 88 97 86
21 90 110 205 180 121 58 46 33 34 80 88 134
22 91 118 261 173 111 54 45 35 36 61 92 105
23 94 115 227 202 102 58 53 38 41 63 95 108
24 108 124 214 191 121 60 47 33 40 76 79 118
25 124 144 222 181 129 54 36 28 51 71 100 132
26 137 141 229 177 121 55 38 25 49 67 104 113
27 142 125 247 178 108 50 40 26 60 64 110 113
28 121 117 234 172 101 65 44 59 60 82 100 106
29 106 121 254 170 112 58 51 33 70 82 101 95
30 91   271 158 122 73 46 30 72 82 107 107
31 92   295   110   40 28   82   117