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USGS Daily Statistics for Washington

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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 14238000 COWLITZ RIVER BELOW MAYFIELD DAM, WA


Lewis County, Washington
Hydrologic Unit Code 17080005
Latitude  46°30'38", Longitude 122°36'54" NAD27
Drainage area 1,400  square miles
Gage datum 226.60 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 1933-10-01 -> 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 8,530 9,010 7,010 6,410 6,730 7,190 5,660 3,120 2,550 2,950 4,830 9,930
2 8,750 8,550 6,890 6,560 6,840 7,110 5,390 3,050 2,600 2,970 4,800 10,100
3 8,770 8,230 6,880 6,380 6,850 7,200 5,170 2,990 2,620 3,120 4,980 10,200
4 8,900 8,580 6,840 6,380 6,930 7,260 4,890 2,900 2,670 3,080 5,170 10,600
5 8,980 8,580 6,830 6,370 7,030 7,320 4,880 2,860 2,730 3,110 5,500 10,400
6 8,760 8,620 6,720 6,420 7,140 7,290 4,880 2,850 2,680 3,110 5,690 9,860
7 9,080 8,900 6,560 6,510 7,040 7,360 4,830 2,860 2,630 3,170 5,940 9,750
8 9,030 8,900 6,460 6,470 7,020 7,420 4,850 2,820 2,690 3,210 6,300 9,460
9 8,900 8,750 6,580 6,440 6,970 7,590 4,870 2,810 2,650 3,350 6,320 9,590
10 8,930 8,850 6,770 6,480 7,000 7,630 4,760 2,790 2,660 3,560 6,250 9,910
11 8,700 8,450 6,760 6,480 7,020 7,490 4,620 2,800 2,670 3,610 6,360 10,100
12 8,960 8,220 6,820 6,470 7,080 7,320 4,540 2,750 2,620 3,580 6,590 10,500
13 9,090 8,010 6,800 6,410 7,200 7,240 4,450 2,730 2,550 3,560 6,750 10,500
14 9,140 7,830 6,760 6,520 7,280 7,120 4,410 2,770 2,570 3,530 6,780 10,200
15 9,380 7,830 6,790 6,660 7,180 7,160 4,410 2,720 2,630 3,480 7,000 10,100
16 9,550 7,860 6,800 6,690 7,140 7,240 4,270 2,790 2,630 3,510 7,080 10,000
17 9,380 7,810 6,770 6,720 7,180 7,270 4,080 2,770 2,600 3,480 7,150 9,650
18 9,230 7,710 6,640 6,930 7,300 7,080 3,930 2,710 2,610 3,590 7,430 9,440
19 9,080 7,820 6,720 6,880 7,300 6,990 3,870 2,690 2,550 3,660 7,620 9,390
20 9,040 7,820 6,590 6,930 7,460 7,100 3,830 2,650 2,550 3,850 7,910 9,610
21 9,050 7,830 6,510 7,000 7,610 6,950 3,750 2,660 2,590 3,940 8,380 9,530
22 8,970 8,110 6,530 7,030 7,550 6,760 3,700 2,630 2,570 4,000 8,560 9,620
23 9,070 8,030 6,470 6,860 7,490 6,630 3,630 2,620 2,580 4,220 9,020 9,870
24 9,310 8,190 6,380 6,770 7,400 6,550 3,610 2,620 2,590 4,300 9,850 9,450
25 9,450 7,980 6,400 6,690 7,400 6,400 3,550 2,600 2,610 4,580 9,840 8,930
26 9,140 7,890 6,330 6,590 7,350 6,280 3,440 2,590 2,700 4,710 9,780 8,670
27 8,780 7,700 6,340 6,550 7,510 6,200 3,420 2,590 2,770 4,540 10,000 8,880
28 8,820 7,480 6,250 6,630 7,500 6,080 3,400 2,610 2,790 4,700 10,200 9,010
29 9,030 7,730 6,230 6,740 7,420 5,930 3,380 2,620 2,760 4,730 9,920 9,110
30 8,990   6,250 6,770 7,340 5,890 3,390 2,580 2,840 4,720 9,710 9,100
31 9,040   6,210   7,250   3,310 2,570   4,710   8,870