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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 -> 2024-09-30)

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 84 113 290 168 126 59 37 28 59 70 118
2 103 95 119 298 150 114 52 42 37 52 75 113
3 95 116 114 299 149 107 52 33 27 46 109 102
4 90 112 135 297 154 101 56 35 28 54 78 95
5 91 108 120 324 141 88 50 37 26 49 89 103
6 95 94 133 294 138 133 46 30 31 51 79 109
7 87 95 157 271 127 117 41 35 47 48 79 110
8 92 93 146 240 118 91 41 50 39 52 88 104
9 101 79 174 221 126 82 41 42 34 69 118 105
10 90 79 141 234 135 84 64 49 31 47 87 108
11 93 102 164 225 140 79 46 43 42 45 89 118
12 94 94 162 223 143 80 42 50 48 51 103 133
13 85 90 175 227 137 82 43 50 36 47 95 124
14 95 92 182 222 129 99 54 42 32 55 86 120
15 89 95 186 205 112 88 39 41 38 104 85 114
16 86 105 178 272 117 86 62 34 38 77 81 99
17 79 93 195 236 140 77 43 29 51 81 92 107
18 92 104 192 203 133 67 53 43 53 58 80 110
19 96 100 194 193 135 67 48 79 47 60 71 94
20 94 117 223 197 126 58 42 38 40 89 97 83
21 89 110 206 180 122 56 46 33 34 76 89 132
22 89 119 263 173 112 52 45 35 36 59 92 104
23 93 115 221 203 102 57 53 38 41 63 94 107
24 108 124 209 192 121 60 47 33 40 75 78 117
25 121 145 221 182 130 54 36 28 51 71 100 132
26 132 142 229 178 122 55 38 25 49 67 104 112
27 139 125 247 179 106 50 40 26 61 64 108 113
28 119 117 233 172 100 65 45 59 61 82 100 104
29 103 117 254 171 113 58 51 33 71 82 101 94
30 90   272 158 121 73 46 30 72 81 107 106
31 91   296   110   40 28   81   117