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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 01102000 IPSWICH RIVER NEAR IPSWICH, MA


Essex County, Massachusetts
Hydrologic Unit Code 01090001
Latitude  42°39'35", Longitude  70°53'39" NAD27
Drainage area 125  square miles
Contributing drainage area 125  square miles
Gage datum 19.83 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 1929-10-01 -> 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
1 204 241 321 549 315 174 93 67 39 61 116 187
2 205 231 320 570 306 177 91 61 39 59 117 189
3 203 227 326 575 299 181 89 56 39 57 117 191
4 201 230 331 570 291 184 88 54 40 57 117 191
5 202 232 344 566 284 185 86 51 40 57 119 188
6 197 233 360 563 278 186 84 47 38 59 121 187
7 196 230 377 555 269 191 81 44 37 64 123 191
8 195 228 389 534 260 201 78 43 35 74 124 200
9 195 222 400 504 253 200 75 42 34 77 124 207
10 200 219 408 473 252 195 75 42 34 75 125 215
11 209 217 411 451 255 187 74 43 34 73 131 217
12 218 214 416 437 256 178 74 45 35 70 138 217
13 220 212 418 428 255 172 73 45 38 68 143 220
14 218 214 429 421 261 168 71 45 41 66 146 222
15 216 215 453 411 272 168 68 45 42 66 151 222
16 214 220 476 407 275 165 66 44 43 68 156 218
17 209 228 487 404 272 159 63 44 44 71 161 215
18 202 235 497 403 264 153 60 43 47 73 161 216
19 198 246 506 403 256 143 58 44 50 76 161 215
20 193 253 509 394 245 136 56 45 55 80 160 214
21 191 254 504 379 236 129 54 46 61 93 159 214
22 191 255 511 365 228 123 54 46 64 108 158 210
23 196 256 522 362 220 117 56 45 65 117 159 206
24 205 260 530 354 212 112 62 44 64 118 160 205
25 219 273 522 348 204 109 69 44 62 116 163 205
26 238 293 512 342 204 107 71 43 61 113 167 205
27 257 311 500 337 204 105 69 42 61 111 173 211
28 272 320 495 331 199 101 67 41 61 111 179 214
29 272 322 502 327 192 99 65 39 62 111 184 216
30 267   513 321 183 95 64 39 62 111 185 213
31 254   529   176   64 39   113   208