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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 66.60 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 1936-10-01 -> 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
1 785 883 989 1,510 1,060 635 386 287 235 307 455 675
2 787 864 1,000 1,540 1,040 640 378 282 236 304 462 682
3 780 863 1,020 1,550 1,020 644 372 275 230 299 474 685
4 774 869 1,040 1,560 999 645 362 264 231 298 483 683
5 774 866 1,060 1,570 979 647 355 252 230 294 489 683
6 766 856 1,070 1,570 957 650 345 236 222 299 495 689
7 760 852 1,100 1,560 930 655 334 225 228 305 495 699
8 753 845 1,110 1,540 904 661 323 231 223 306 498 709
9 752 834 1,140 1,500 883 656 316 230 217 312 503 721
10 752 822 1,150 1,470 871 654 310 239 217 313 507 737
11 752 817 1,160 1,430 857 633 307 247 226 316 510 751
12 757 814 1,170 1,390 849 617 307 253 237 312 523 764
13 755 810 1,180 1,360 842 602 310 261 243 312 536 776
14 751 816 1,210 1,330 842 595 306 260 249 318 544 787
15 754 816 1,250 1,300 831 581 297 256 250 327 558 797
16 753 827 1,280 1,290 827 570 284 255 250 336 566 808
17 746 837 1,320 1,280 824 555 278 251 247 348 576 811
18 736 852 1,350 1,270 812 540 270 252 250 353 580 821
19 734 863 1,360 1,250 807 526 268 254 262 357 578 822
20 728 865 1,380 1,230 795 506 261 260 273 366 578 819
21 728 872 1,400 1,210 782 489 266 267 281 386 578 815
22 730 872 1,420 1,190 766 473 272 284 289 394 579 812
23 734 881 1,450 1,170 745 458 276 286 296 404 587 805
24 753 898 1,470 1,160 722 443 299 278 296 410 595 802
25 793 928 1,480 1,150 709 429 311 270 294 413 605 804
26 842 956 1,470 1,130 698 423 319 261 292 419 618 811
27 879 974 1,470 1,120 685 413 318 251 296 423 635 814
28 910 986 1,460 1,100 673 409 313 246 301 431 643 807
29 915 1,020 1,460 1,090 660 402 312 243 306 430 660 801
30 913   1,470 1,080 644 394 305 241 308 438 664 798
31 903   1,490   636   296 243   447   789