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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 01175500 SWIFT RIVER AT WEST WARE, MA


Hampshire County, Massachusetts
Hydrologic Unit Code 01080204
Latitude  42°16'04", Longitude  72°19'59" NAD27
Drainage area 189  square miles
Contributing drainage area 189  square miles
Gage datum 364.54 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 1939-10-01 -> 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 81 95 86 128 210 177 96 84 85 76 73 72
2 89 95 85 131 209 174 91 85 86 73 72 73
3 90 94 84 134 207 170 88 85 84 74 74 75
4 89 96 85 139 207 169 80 83 83 75 74 75
5 89 99 84 146 202 164 84 81 83 75 78 76
6 87 100 85 156 196 159 83 79 84 76 77 76
7 87 99 86 162 194 154 83 80 84 74 75 77
8 87 98 86 166 191 150 80 81 86 72 75 79
9 86 96 87 166 187 144 79 83 84 71 77 81
10 86 93 86 164 183 138 78 83 83 69 78 81
11 87 93 87 165 181 135 79 83 83 69 72 80
12 87 92 88 167 179 131 77 83 84 63 79 81
13 85 91 89 173 177 127 77 80 85 70 77 81
14 88 89 92 176 174 128 78 78 84 70 78 81
15 92 89 93 175 166 127 79 79 84 71 80 80
16 91 88 92 184 165 123 80 78 83 71 81 81
17 90 87 92 198 169 117 79 76 81 70 81 82
18 92 89 92 205 169 112 78 79 80 71 80 83
19 94 87 93 199 164 107 77 83 82 74 80 84
20 93 87 94 212 163 105 75 77 81 76 79 84
21 93 87 97 212 161 102 75 76 82 75 77 86
22 92 78 100 207 156 101 75 77 83 74 74 87
23 91 86 101 208 156 99 74 78 82 73 75 87
24 92 87 102 207 157 98 77 80 80 73 76 89
25 94 86 100 205 157 98 78 81 78 73 75 81
26 95 86 101 205 155 97 77 80 80 74 73 90
27 93 86 103 210 157 97 78 81 79 73 73 90
28 95 86 105 212 154 97 79 82 79 71 74 90
29 95 100 109 212 151 95 80 84 81 69 74 90
30 96   113 210 153 96 79 86 79 69 72 91
31 95   121   173   80 87   71   91