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USGS Surface-Water 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 -> 2023-09-30)

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 14,200 19,200 22,100 17,200 11,600 6,600 5,000 3,770 5,890 6,660 10,400
2 13,700 13,800 19,300 21,800 16,200 11,800 5,960 5,080 4,040 5,500 6,200 11,400
3 14,000 14,200 19,800 22,200 15,000 11,600 5,810 4,710 4,310 5,510 5,970 11,700
4 13,800 15,400 19,200 21,000 14,600 12,300 5,320 4,790 3,930 5,490 6,000 10,400
5 13,200 16,700 19,800 20,800 15,400 12,700 5,210 4,710 3,810 5,200 6,390 10,400
6 12,900 16,900 22,800 21,200 17,100 11,400 5,320 4,410 4,200 4,920 7,700 11,100
7 12,700 16,500 24,200 20,700 18,300 10,900 5,190 4,260 5,680 4,930 8,850 10,300
8 12,300 15,900 23,600 19,400 19,100 9,850 5,560 4,400 7,820 5,300 7,570 10,100
9 12,800 15,400 22,600 19,400 19,200 9,130 5,450 4,530 7,330 5,030 7,920 11,000
10 13,400 14,500 20,900 19,100 19,200 8,840 5,180 4,250 5,740 6,290 8,200 11,000
11 12,500 14,400 20,400 19,200 17,100 8,530 5,300 4,040 6,000 6,720 7,790 11,900
12 12,400 14,300 20,900 19,100 16,900 8,480 4,970 4,300 5,240 5,510 7,010 12,900
13 11,900 14,400 21,200 19,000 17,300 9,070 5,090 4,690 4,380 4,680 7,010 12,300
14 12,200 15,400 22,400 19,900 17,000 9,810 5,290 5,260 4,210 4,860 7,580 11,700
15 12,300 16,800 24,500 20,900 15,900 10,000 5,050 5,370 4,500 5,100 7,590 11,400
16 11,900 17,200 25,000 20,900 16,100 8,650 4,840 4,560 4,360 6,940 7,570 11,700
17 12,600 15,900 23,400 21,800 17,500 7,660 4,630 4,070 4,300 9,230 7,220 12,600
18 12,400 15,400 22,400 23,300 17,700 7,400 4,530 4,450 4,720 7,110 7,300 12,200
19 12,000 16,300 24,700 21,000 18,100 7,440 4,940 5,870 6,450 6,120 7,100 11,100
20 13,600 17,100 23,600 18,000 17,200 9,010 4,700 6,550 6,970 6,330 6,980 10,600
21 15,700 17,700 25,100 18,900 15,300 8,210 4,930 5,250 6,120 5,790 7,430 10,500
22 14,600 17,800 27,000 19,400 14,700 9,730 4,840 4,520 4,940 5,650 8,280 10,400
23 13,500 18,500 27,600 18,100 14,700 11,000 4,600 4,480 5,360 5,720 8,760 11,100
24 13,600 19,400 25,900 17,200 14,700 11,400 4,680 4,760 5,890 5,680 8,430 11,300
25 15,100 21,200 24,700 16,200 13,600 9,130 4,500 4,960 5,730 5,770 7,950 11,400
26 17,200 21,700 23,600 16,800 12,600 7,370 4,440 4,650 6,360 5,810 8,110 11,700
27 17,500 21,600 22,300 19,500 12,100 6,600 4,170 4,920 6,510 5,910 7,880 12,200
28 17,200 21,200 21,800 20,500 11,600 6,590 4,020 4,440 5,630 6,010 8,160 12,800
29 16,200 22,700 21,900 18,900 11,500 6,960 4,020 3,840 6,000 6,740 9,240 12,300
30 15,000   23,600 18,200 12,000 6,740 3,950 3,570 6,510 7,990 9,830 12,100
31 14,400   23,200   11,800   4,270 3,370   7,770   12,900