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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 -> 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 74 79 115 182 105 64 33 22 13 21 44 73
2 76 78 116 191 102 65 32 21 14 21 44 72
3 74 81 123 190 100 66 33 19 15 20 45 72
4 74 84 124 186 98 64 32 18 14 21 46 71
5 75 82 124 184 96 65 31 17 13 22 48 69
6 72 79 126 182 92 68 29 15 12 26 48 72
7 71 80 130 179 89 70 27 14 13 28 48 76
8 69 80 132 171 86 69 26 15 12 28 48 78
9 69 77 136 161 87 65 26 16 12 28 50 77
10 70 76 137 153 90 61 26 18 12 27 51 84
11 71 77 135 147 89 58 24 18 14 25 53 83
12 71 79 138 141 87 54 24 19 17 25 54 84
13 71 78 138 137 85 54 24 19 17 25 57 83
14 70 79 145 135 90 56 24 18 17 26 59 83
15 71 79 158 130 91 55 22 18 17 30 62 84
16 70 82 164 134 92 52 21 17 17 32 61 81
17 68 84 165 141 92 49 21 17 16 34 63 81
18 65 86 169 138 87 46 19 16 17 33 64 82
19 65 92 170 135 86 43 18 18 21 33 61 81
20 66 92 172 132 83 41 17 19 22 36 60 77
21 67 92 171 125 81 39 18 18 23 42 60 75
22 67 93 178 121 78 38 19 18 22 42 62 78
23 68 94 187 120 73 37 20 18 22 41 62 75
24 71 98 183 118 70 36 26 17 22 42 63 75
25 83 111 177 117 68 37 28 17 20 41 66 78
26 93 117 172 114 69 36 27 16 23 42 70 78
27 96 116 170 113 67 35 26 14 23 41 72 82
28 99 116 166 111 64 35 25 14 22 43 71 81
29 93 118 165 109 62 34 25 14 23 44 72 78
30 89   172 107 62 34 25 14 22 43 73 78
31 84   179   61   23 14   44   76