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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 -> 2021-09-30)

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 79 115 184 104 65 32 22 12 20 41 74
2 76 78 117 193 101 66 32 21 13 20 42 72
3 73 81 123 192 99 66 31 19 14 19 43 73
4 74 83 125 188 97 65 30 18 14 21 44 71
5 75 81 125 187 95 66 29 17 12 21 46 69
6 72 79 127 185 92 69 28 15 12 24 47 73
7 70 79 131 182 89 71 26 14 12 27 47 77
8 69 79 132 173 86 70 25 14 12 26 48 78
9 69 76 136 164 87 66 25 14 12 27 50 78
10 70 74 137 155 91 61 25 16 12 26 50 85
11 71 76 136 149 90 58 23 16 13 25 53 84
12 71 77 138 143 88 55 24 17 16 25 54 84
13 71 76 138 139 86 54 24 18 16 24 56 83
14 70 78 144 137 91 57 24 17 16 26 57 83
15 71 78 157 132 93 55 22 16 15 29 61 85
16 70 82 163 136 93 52 20 16 15 32 60 82
17 67 83 164 143 94 49 19 15 14 34 62 80
18 64 85 168 140 89 46 18 15 15 33 63 82
19 64 91 170 136 87 43 18 16 17 33 60 80
20 64 92 172 133 84 41 17 17 18 36 59 77
21 65 91 171 126 81 39 17 16 19 43 60 75
22 66 92 179 122 78 38 19 17 19 42 62 77
23 66 94 189 121 73 37 20 16 19 41 62 74
24 70 98 185 119 70 37 26 16 19 42 63 74
25 82 111 179 118 69 37 28 16 18 41 66 76
26 91 117 173 115 70 36 27 14 21 41 71 77
27 94 116 172 114 68 35 26 12 21 39 73 81
28 98 117 167 112 65 35 25 12 21 41 72 80
29 92 118 166 110 62 34 25 13 21 42 72 78
30 88   174 108 62 34 24 13 21 42 73 77
31 84   182   62   22 13   41   76