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USGS Daily Statistics for Maryland

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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 01646500 POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA


Montgomery County, Maryland
Hydrologic Unit Code 02070008
Latitude  38°56'59.2", Longitude  77°07'39.5" NAD83
Drainage area 11,560  square miles
Gage datum 37.20 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 86 - 87 years of record in, ft3/s   (Calculation Period 1929-10-01 -> 2017-09-30)

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 13,700 14,400 18,900 22,500 17,000 11,400 6,620 4,730 3,660 5,410 6,290 10,500
2 13,600 14,000 18,700 22,200 15,700 11,700 5,960 4,860 3,670 5,190 5,830 11,600
3 13,900 14,500 19,300 22,600 14,700 11,100 5,790 4,380 3,420 5,310 5,610 11,900
4 13,600 15,800 18,900 21,300 14,500 11,200 5,290 4,210 3,450 5,350 5,710 10,600
5 13,000 16,900 19,800 21,100 15,200 11,300 5,210 4,040 3,550 5,070 6,220 10,500
6 12,700 16,900 23,100 21,500 16,300 10,900 5,300 3,970 4,030 4,790 7,520 11,400
7 12,700 16,500 24,800 21,000 16,800 10,700 5,070 3,860 5,640 4,840 8,630 10,600
8 12,300 15,800 24,300 19,400 17,400 9,720 5,300 4,160 7,950 5,280 7,390 10,300
9 12,800 15,200 23,300 19,400 17,900 9,040 5,140 4,350 7,320 5,020 7,840 11,300
10 13,500 14,200 21,500 19,200 18,500 8,830 5,040 4,050 4,990 6,380 8,100 11,400
11 12,700 14,200 20,900 19,400 16,700 8,450 5,260 3,860 4,610 6,850 7,460 12,300
12 12,600 14,100 21,300 19,300 16,700 8,160 4,940 4,140 4,300 5,530 6,730 13,300
13 12,000 14,100 21,800 18,900 17,000 8,730 5,100 4,500 3,820 4,630 6,760 12,800
14 12,200 15,000 23,100 20,000 16,500 9,580 5,320 5,190 3,720 4,760 7,180 12,200
15 12,300 16,600 25,300 21,000 15,200 9,940 5,050 5,330 4,140 5,050 7,080 11,700
16 11,900 17,100 26,000 20,800 15,300 8,610 4,870 4,460 4,130 7,050 7,040 11,300
17 12,800 15,800 24,300 21,700 17,000 7,620 4,670 3,960 4,100 9,530 6,720 11,200
18 12,500 15,200 23,200 23,000 17,200 7,390 4,570 4,360 4,510 7,290 6,830 11,300
19 12,100 16,200 25,700 20,900 17,400 7,440 5,010 5,850 6,020 6,260 6,660 10,600
20 13,700 17,100 24,500 17,900 16,400 9,110 4,760 6,530 6,580 6,480 6,620 10,300
21 15,700 17,800 25,900 18,700 14,600 8,250 4,970 5,190 5,920 5,920 7,130 10,300
22 14,500 17,900 27,500 19,400 14,400 9,730 4,550 4,280 4,770 5,790 8,050 10,100
23 13,500 18,700 28,200 18,200 14,600 10,800 4,320 4,160 5,170 5,870 8,650 10,200
24 13,600 19,400 26,600 17,300 14,600 10,900 4,400 4,600 5,470 5,830 8,340 10,500
25 14,900 21,200 25,500 16,300 13,600 8,680 4,250 4,900 5,200 5,920 7,620 10,500
26 16,900 21,400 24,400 17,000 12,500 7,040 4,120 4,590 5,820 5,950 7,750 10,800
27 17,200 21,200 22,900 19,800 11,800 6,370 3,860 4,930 5,760 6,030 7,600 11,600
28 17,100 21,000 22,400 20,700 11,200 6,470 3,770 4,440 4,710 6,110 8,010 12,500
29 16,200 23,300 22,600 18,900 11,300 6,930 3,740 3,800 4,710 6,830 9,270 12,100
30 15,100   24,300 18,200 11,900 6,740 3,720 3,540 5,540 8,100 9,950 11,800
31 14,600   23,700   11,700   4,070 3,330   7,700   12,800