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USGS Surface-Water 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 01097000 ASSABET RIVER AT MAYNARD, MA


Middlesex County, Massachusetts
Hydrologic Unit Code 01070005
Latitude  42°25'55", Longitude  71°27'01" NAD27
Drainage area 116  square miles
Contributing drainage area 116  square miles
Gage datum 146 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 1940-10-01 -> 2022-09-30)

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
1 211 234 289 495 306 196 106 68 63 88 134 195
2 217 226 288 514 295 203 106 68 68 82 133 197
3 219 237 306 519 283 208 101 66 71 78 138 199
4 221 258 322 515 281 207 95 62 70 79 144 194
5 220 262 328 507 276 201 93 59 62 82 146 190
6 214 250 330 505 265 205 90 56 56 88 147 193
7 209 241 343 488 257 212 87 55 60 91 146 201
8 204 240 356 461 250 218 86 59 63 91 146 208
9 208 230 362 430 247 213 93 63 67 94 149 209
10 214 219 366 405 250 200 100 67 67 91 155 212
11 218 221 363 393 256 188 97 68 70 90 159 213
12 214 229 365 381 258 173 90 66 78 89 162 223
13 211 225 368 370 256 167 87 66 81 89 162 228
14 207 228 380 370 257 175 86 67 73 89 164 227
15 208 233 405 362 255 176 81 66 68 96 168 235
16 207 240 412 370 250 165 76 65 64 108 166 232
17 201 248 416 397 250 157 70 64 62 118 167 226
18 193 248 433 400 247 151 69 63 67 114 165 227
19 195 253 449 380 241 143 70 75 77 108 159 225
20 200 251 446 361 235 135 71 107 78 110 152 216
21 204 249 438 340 227 130 72 102 74 121 153 210
22 212 254 452 330 219 123 74 83 72 125 158 211
23 223 262 482 333 207 120 78 71 70 119 170 213
24 236 267 482 336 197 119 89 67 71 116 178 215
25 270 289 464 332 195 118 91 62 72 115 180 220
26 304 314 453 324 200 116 83 55 76 122 189 225
27 308 312 451 320 204 112 76 51 78 125 195 226
28 314 301 451 316 199 110 73 54 79 125 193 224
29 293 298 449 314 190 111 73 58 85 128 192 215
30 266   465 313 187 108 72 61 90 136 195 212
31 246   485   190   67 63   136   212