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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 water year of record in, ft3/s   (Calculation Period 1929-10-01 -> 2021-09-30)

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 13,900 14,300 19,200 22,300 17,300 11,600 6,660 5,050 3,720 5,920 6,670 10,500
2 13,900 13,900 19,400 22,000 16,300 11,900 5,990 5,130 3,770 5,520 6,160 11,600
3 14,000 14,300 19,900 22,300 15,100 11,600 5,830 4,760 3,570 5,530 5,940 11,900
4 13,800 15,500 19,300 21,100 14,700 12,300 5,350 4,840 3,630 5,510 5,990 10,600
5 13,200 16,600 19,900 20,900 15,400 12,700 5,250 4,740 3,670 5,190 6,420 10,500
6 12,900 16,600 22,900 21,300 17,100 11,400 5,360 4,450 4,110 4,900 7,770 11,300
7 12,800 16,300 24,300 20,800 18,000 11,000 5,230 4,300 5,640 4,910 8,950 10,500
8 12,400 15,800 23,800 19,300 18,200 9,900 5,600 4,450 7,850 5,310 7,660 10,200
9 12,800 15,300 22,800 19,200 18,300 9,160 5,430 4,580 7,320 5,040 8,010 11,200
10 13,400 14,500 21,000 18,900 18,700 8,890 5,200 4,280 5,650 6,340 8,310 11,200
11 12,600 14,400 20,600 19,100 16,900 8,570 5,340 4,050 5,940 6,780 7,880 12,100
12 12,500 14,400 21,000 19,100 16,800 8,520 5,000 4,320 5,210 5,550 7,080 13,100
13 12,000 14,500 21,400 19,000 17,200 9,120 5,130 4,710 4,350 4,710 7,060 12,500
14 12,300 15,400 22,600 19,900 16,900 9,870 5,330 5,300 4,190 4,890 7,500 11,900
15 12,300 16,900 24,600 20,900 15,900 10,100 5,070 5,420 4,490 5,140 7,490 11,600
16 12,000 17,300 25,200 21,000 16,100 8,700 4,870 4,600 4,360 7,020 7,480 11,700
17 12,700 16,000 23,600 22,000 17,500 7,690 4,660 4,090 4,280 9,370 7,170 12,600
18 12,500 15,500 22,600 23,400 17,800 7,440 4,560 4,480 4,700 7,200 7,260 12,200
19 12,000 16,400 24,800 21,100 18,200 7,480 4,970 5,930 6,500 6,190 7,060 11,200
20 13,700 17,100 23,800 18,100 17,200 9,070 4,720 6,590 7,040 6,410 6,970 10,600
21 15,700 17,700 25,300 18,900 15,300 8,270 4,960 5,280 6,180 5,860 7,450 10,500
22 14,700 17,800 27,200 19,500 14,700 9,810 4,880 4,530 4,980 5,720 8,330 10,500
23 13,500 18,600 27,800 18,200 14,700 11,100 4,640 4,510 5,310 5,790 8,840 10,900
24 13,700 19,400 26,100 17,200 14,700 11,500 4,720 4,800 5,580 5,750 8,510 11,100
25 15,200 21,300 24,900 16,200 13,700 9,210 4,550 5,010 5,420 5,840 8,030 11,300
26 17,300 21,900 23,800 16,800 12,700 7,420 4,480 4,680 6,210 5,860 8,200 11,700
27 17,600 21,700 22,400 19,600 12,100 6,640 4,210 4,960 6,460 5,980 7,970 12,200
28 17,300 21,200 22,000 20,600 11,600 6,640 4,060 4,480 5,600 6,090 8,250 12,900
29 16,300 22,700 22,100 19,000 11,500 7,020 4,050 3,880 6,010 6,810 9,360 12,400
30 15,100   23,800 18,300 12,000 6,810 3,980 3,600 6,540 8,040 9,970 12,200
31 14,500   23,300   11,800   4,320 3,390   7,790   13,000