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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 01101500 IPSWICH RIVER AT SOUTH MIDDLETON, MA


Essex County, Massachusetts
Hydrologic Unit Code 01090001
Latitude  42°34'10", Longitude  71°01'39" NAD27
Drainage area 44.5  square miles
Contributing drainage area 44.5  square miles
Gage datum 44.16 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 1937-10-01 -> 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 75 81 114 184 105 64 32 22 13 21 45 73
2 77 79 116 192 101 65 32 21 14 21 45 72
3 74 82 123 191 99 66 32 19 14 20 46 72
4 75 85 124 188 98 64 32 18 14 22 46 71
5 75 83 124 187 96 65 31 17 13 22 48 69
6 72 80 127 185 92 68 29 15 12 26 48 72
7 71 80 131 182 89 70 27 14 13 28 48 77
8 69 81 134 173 86 69 26 15 12 28 48 78
9 69 78 137 163 87 65 25 16 12 28 50 77
10 73 76 138 154 90 61 25 18 12 27 51 84
11 74 78 137 148 89 58 24 18 14 25 53 85
12 74 79 139 143 87 54 24 19 17 25 54 86
13 75 78 139 139 85 53 24 19 17 25 57 85
14 74 79 145 137 89 56 24 18 17 26 58 85
15 74 79 158 132 91 55 22 18 17 29 61 86
16 73 82 164 135 91 51 21 17 17 32 61 83
17 70 84 165 142 92 49 20 17 16 33 63 82
18 67 86 169 138 87 46 19 16 17 33 63 84
19 67 92 170 135 85 43 18 18 21 33 61 84
20 67 92 171 132 82 41 17 19 22 35 59 81
21 68 92 170 125 80 39 18 18 23 42 60 79
22 68 93 177 122 78 38 19 18 22 42 62 80
23 68 94 186 120 73 37 20 18 22 41 63 78
24 72 98 184 118 69 36 26 17 21 41 64 77
25 84 111 178 116 68 36 28 17 20 42 66 79
26 94 116 173 114 69 36 26 16 23 42 71 79
27 97 115 171 113 67 35 25 14 22 41 73 83
28 101 116 166 110 64 35 25 14 22 43 72 82
29 95 117 167 108 61 34 25 14 22 44 72 79
30 91   174 107 62 34 25 14 22 44 73 79
31 86   181   62   23 14   45   77