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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 -> 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
1 215 239 287 490 307 197 106 71 64 94 134 193
2 222 230 286 509 297 201 105 71 69 87 133 195
3 223 239 307 513 286 205 104 67 71 82 137 196
4 224 260 325 510 283 203 101 62 69 81 142 192
5 222 266 329 505 277 197 100 59 62 84 144 189
6 216 253 333 503 267 200 95 56 58 89 146 191
7 211 243 351 486 260 207 89 55 62 92 144 199
8 206 241 367 459 252 213 87 61 65 92 144 206
9 209 232 370 428 250 208 93 67 68 94 148 207
10 221 220 373 403 255 198 100 70 69 91 152 209
11 231 221 369 390 262 185 99 70 74 89 157 216
12 226 228 370 379 262 170 94 69 81 88 159 232
13 224 226 370 371 257 163 90 68 84 88 160 236
14 222 228 383 371 256 170 88 67 77 89 161 232
15 221 233 410 362 252 173 83 66 71 96 165 235
16 218 239 416 367 249 161 80 66 66 107 164 232
17 210 248 419 391 252 154 77 65 63 117 165 230
18 203 251 435 393 248 149 78 67 68 114 163 236
19 203 257 448 376 241 141 76 81 81 109 157 246
20 207 253 443 359 235 133 76 112 84 110 149 236
21 210 249 433 339 228 127 76 106 79 121 150 225
22 217 253 445 328 220 121 76 86 76 126 157 222
23 227 263 473 330 212 119 80 73 72 121 170 224
24 240 268 480 334 204 118 90 68 73 117 177 227
25 273 289 467 331 202 116 91 64 73 116 178 231
26 310 311 455 322 203 114 83 60 78 123 185 233
27 317 308 450 318 205 113 76 56 80 125 192 232
28 322 298 448 313 199 112 74 58 80 124 190 229
29 300 297 449 311 190 112 73 61 86 126 189 220
30 272   464 310 187 109 73 62 93 135 192 217
31 251   482   191   69 64   136   216