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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 -> 2019-09-30)

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
1 750 863 993 1,520 1,060 642 386 273 219 301 440 679
2 753 847 1,000 1,550 1,030 646 376 270 214 297 447 687
3 747 848 1,020 1,570 1,010 650 365 265 206 291 460 689
4 743 854 1,040 1,590 990 653 351 256 205 289 471 685
5 744 853 1,060 1,590 968 656 341 244 201 284 479 684
6 737 843 1,080 1,590 946 661 328 228 193 287 487 689
7 732 840 1,100 1,580 920 668 317 217 201 293 489 698
8 727 832 1,110 1,560 896 676 306 218 197 293 494 708
9 729 821 1,140 1,530 877 671 297 214 193 301 501 720
10 725 809 1,150 1,490 867 671 288 222 194 304 507 735
11 724 804 1,160 1,450 856 648 284 230 203 309 512 743
12 728 801 1,170 1,410 849 631 278 238 213 307 525 753
13 721 797 1,180 1,380 844 615 277 248 221 308 537 762
14 716 804 1,210 1,350 847 609 271 249 229 314 545 770
15 720 807 1,250 1,320 838 594 263 247 233 323 560 781
16 718 819 1,280 1,310 835 582 250 247 235 333 566 791
17 708 832 1,320 1,300 834 567 244 244 234 342 577 792
18 698 845 1,350 1,280 823 551 235 242 238 347 582 796
19 697 856 1,370 1,260 820 536 233 240 246 350 580 790
20 692 859 1,390 1,240 809 515 227 244 259 360 581 784
21 695 868 1,410 1,220 794 497 232 252 267 382 583 777
22 700 870 1,440 1,200 777 480 238 268 275 390 583 777
23 706 880 1,470 1,180 757 464 244 269 284 402 590 769
24 728 898 1,480 1,170 735 450 269 260 285 407 597 768
25 772 929 1,490 1,160 721 436 284 250 285 412 605 768
26 819 959 1,490 1,140 712 429 295 240 283 416 619 774
27 856 978 1,490 1,130 699 418 298 230 288 417 637 776
28 887 990 1,480 1,110 686 413 294 225 295 423 645 769
29 892 1,040 1,470 1,100 672 404 294 223 301 426 665 764
30 891   1,480 1,080 653 395 286 221 302 432 669 762
31 882   1,500   643   281 225   432   753