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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 01099500 CONCORD R BELOW R MEADOW BROOK, AT LOWELL, MA


Middlesex County, Massachusetts
Hydrologic Unit Code 01070005
Latitude  42°38'12", Longitude  71°18'09" NAD27
Drainage area 400  square miles
Contributing drainage area 307  square miles
Gage datum 67.41 feet above NGVD29
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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 1936-10-01 -> 2020-09-30)

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
1 754 864 993 1,520 1,060 642 388 274 220 298 443 678
2 758 847 1,000 1,550 1,030 646 378 270 215 294 450 685
3 753 847 1,020 1,570 1,010 650 366 265 207 289 463 688
4 749 853 1,040 1,590 990 653 352 256 206 287 472 684
5 751 851 1,060 1,590 968 656 341 243 202 282 480 683
6 744 842 1,080 1,590 946 661 328 228 194 285 488 687
7 739 839 1,100 1,580 920 668 317 217 202 291 489 696
8 733 832 1,110 1,560 896 676 307 220 198 291 494 706
9 735 821 1,140 1,530 877 671 298 216 193 299 501 718
10 730 809 1,150 1,490 867 668 289 225 194 302 507 734
11 728 804 1,160 1,450 856 647 285 232 203 307 511 745
12 732 801 1,170 1,410 849 630 280 240 213 305 524 755
13 725 797 1,180 1,380 844 615 281 250 220 306 535 765
14 719 804 1,210 1,350 847 609 276 250 228 312 543 777
15 723 807 1,250 1,320 838 594 267 248 232 320 558 789
16 720 819 1,280 1,310 835 583 254 248 233 330 564 800
17 710 832 1,320 1,300 834 567 247 244 232 342 574 802
18 700 845 1,350 1,280 823 551 239 242 236 347 579 805
19 698 856 1,370 1,260 820 537 236 240 245 351 577 799
20 693 859 1,390 1,240 809 516 230 244 257 361 578 792
21 695 868 1,410 1,220 794 500 235 251 264 383 580 784
22 699 870 1,440 1,200 777 483 240 266 273 391 581 783
23 705 880 1,470 1,180 757 468 247 268 282 402 588 773
24 727 898 1,480 1,170 735 453 273 259 283 407 595 771
25 770 929 1,490 1,160 721 439 288 249 282 411 605 770
26 819 959 1,490 1,140 712 431 299 239 281 415 618 775
27 856 978 1,490 1,130 699 420 301 229 286 417 637 777
28 887 990 1,480 1,110 686 415 297 224 293 424 645 770
29 892 1,040 1,470 1,100 672 406 296 222 298 428 664 764
30 891   1,480 1,080 653 397 288 221 299 434 668 763
31 882   1,500   643   282 226   435   756