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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 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 -> 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
1 215 240 287 493 309 195 106 69 65 94 135 194
2 221 231 287 510 299 200 106 68 69 88 134 197
3 222 241 308 515 287 205 104 66 71 82 138 198
4 224 262 326 512 284 203 102 62 70 82 143 194
5 223 268 331 507 277 197 101 59 62 85 145 191
6 217 255 332 504 266 200 96 57 58 90 147 193
7 213 245 348 486 257 207 90 55 63 93 146 201
8 208 244 365 459 250 214 88 60 65 93 145 208
9 211 234 369 429 248 209 94 66 68 95 148 208
10 223 222 373 404 250 198 101 70 69 92 154 211
11 233 223 370 392 255 185 98 70 74 90 158 216
12 228 230 371 380 255 170 94 69 81 89 161 230
13 226 227 372 371 253 164 90 68 85 89 161 234
14 224 230 385 370 253 171 88 68 78 90 163 231
15 223 234 413 362 250 173 83 67 72 97 167 236
16 219 241 419 368 247 162 81 66 66 108 165 233
17 212 248 420 393 248 154 77 65 64 118 167 231
18 204 251 434 395 245 149 78 67 69 115 164 237
19 205 258 448 378 240 141 77 81 81 110 158 246
20 208 255 444 361 234 133 76 112 85 111 151 237
21 212 251 435 341 227 128 76 106 80 122 152 226
22 219 255 447 330 219 122 77 86 76 127 158 223
23 229 265 476 331 206 119 81 74 73 122 170 225
24 242 270 482 336 195 119 91 69 73 118 178 229
25 276 291 468 333 194 117 92 65 74 117 179 233
26 313 313 456 323 197 115 84 61 79 124 187 235
27 320 310 451 318 201 113 77 57 81 126 194 234
28 325 299 451 314 197 113 74 58 80 126 192 230
29 303 297 452 312 188 113 73 61 86 128 190 222
30 274   467 312 186 109 74 63 94 136 193 218
31 253   485   189   70 65   137   217