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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 01100000 MERRIMACK RIVER BL CONCORD RIVER AT LOWELL, MA


Middlesex County, Massachusetts
Hydrologic Unit Code 01070006
Latitude  42°38'45", Longitude  71°17'56" NAD27
Drainage area 4,635  square miles
Contributing drainage area 4,421  square miles
Gage datum 4.37 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 1922-10-01 -> 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 7,500 7,710 8,780 19,100 15,800 8,460 5,290 3,710 2,790 3,540 6,250 8,590
2 7,740 7,510 8,610 19,800 15,400 8,410 5,100 3,540 2,880 3,690 6,170 8,600
3 7,580 7,290 8,700 20,400 15,200 8,490 5,020 3,430 2,920 3,730 6,280 8,610
4 7,350 7,520 8,830 20,900 15,100 8,350 4,660 3,470 2,790 3,710 6,830 8,330
5 7,300 7,650 8,910 21,100 14,900 7,970 4,630 3,330 2,730 3,580 7,320 8,080
6 7,260 7,580 9,080 21,400 14,200 7,630 4,520 3,170 2,600 3,550 7,000 8,040
7 7,300 7,470 9,530 21,700 13,300 7,540 4,390 3,110 2,690 3,710 6,520 8,370
8 7,310 7,420 10,100 21,400 12,600 7,550 4,190 3,040 2,860 4,010 6,510 8,840
9 7,260 7,330 10,500 20,600 12,200 7,320 4,120 3,090 2,850 3,960 6,460 8,790
10 7,480 7,110 10,900 19,600 11,900 7,300 4,020 3,190 2,860 4,020 6,730 8,530
11 7,950 6,960 11,000 19,100 11,700 7,200 3,890 3,370 2,880 4,010 6,890 8,550
12 7,970 7,080 11,200 19,100 11,600 6,980 3,860 3,700 3,250 3,800 7,120 8,790
13 7,880 7,160 11,700 19,400 11,500 6,710 3,790 3,750 3,290 3,970 7,140 8,820
14 7,870 7,270 12,400 19,500 11,800 6,610 3,860 3,600 3,190 3,970 7,280 8,750
15 7,730 7,250 13,000 19,300 12,200 6,730 3,810 3,460 3,060 4,200 7,420 8,710
16 7,740 7,370 13,200 19,200 12,100 6,690 3,860 3,330 3,050 4,500 7,240 8,510
17 7,640 7,370 13,200 20,000 11,800 6,550 3,780 3,180 3,150 4,640 7,200 8,170
18 7,300 7,320 13,400 20,000 11,500 6,260 3,620 3,180 3,350 4,800 7,250 8,100
19 7,250 7,420 14,300 19,800 11,200 6,010 3,490 3,060 3,470 4,840 7,190 8,350
20 7,340 7,370 15,200 19,300 10,900 5,790 3,430 3,130 3,510 4,740 6,990 8,340
21 7,400 7,310 15,500 18,700 10,600 5,600 3,510 2,970 3,600 5,020 7,110 8,120
22 7,330 7,400 15,300 18,200 10,500 5,420 3,480 2,840 4,020 5,600 7,140 8,220
23 7,270 8,120 15,600 18,100 10,000 5,250 3,480 2,800 4,120 5,610 7,110 8,300
24 7,290 8,370 15,400 17,800 9,460 5,120 3,690 2,760 3,840 5,330 7,120 8,400
25 7,800 8,730 15,200 17,700 9,440 5,180 3,740 2,720 3,410 5,540 7,210 8,320
26 8,420 9,240 15,400 17,400 9,600 5,200 3,550 2,760 3,450 5,960 7,380 8,860
27 9,050 9,350 15,700 17,100 9,410 5,220 3,370 2,730 3,360 5,950 7,790 8,890
28 9,220 9,170 16,200 16,700 9,100 5,150 3,320 2,590 3,390 5,900 8,030 8,680
29 9,000 9,350 17,000 16,200 8,740 5,220 3,500 2,630 3,330 6,050 8,270 8,580
30 8,490   17,800 16,200 8,250 5,360 3,750 2,780 3,410 6,160 8,500 8,250
31 8,010   18,500   8,400   3,850 2,840   6,240   7,910