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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 -> 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 13,600 14,300 19,000 21,800 17,200 11,400 6,530 4,920 3,720 5,980 6,550 10,200
2 13,600 13,800 19,300 21,600 16,200 11,700 5,900 5,000 4,000 5,730 6,100 11,200
3 13,800 14,100 19,800 22,200 15,000 11,400 5,740 4,640 4,270 5,820 5,880 11,500
4 13,600 15,400 19,200 21,500 14,600 12,100 5,270 4,720 3,900 5,700 5,900 10,300
5 13,000 16,500 20,000 21,300 15,300 12,500 5,160 4,630 3,770 5,330 6,290 10,200
6 12,700 16,700 22,900 21,400 17,000 11,200 5,260 4,350 4,150 5,000 7,570 10,900
7 12,600 16,300 24,100 20,800 18,200 10,700 5,140 4,210 5,590 4,970 8,690 10,200
8 12,100 15,800 23,500 19,400 18,900 9,710 5,490 4,380 7,690 5,300 7,440 9,910
9 12,600 15,400 22,500 19,400 19,100 9,010 5,380 4,560 7,220 5,020 7,780 10,800
10 13,500 14,500 20,900 19,000 19,000 8,730 5,110 4,650 5,670 6,250 8,060 10,900
11 12,900 14,300 20,800 19,100 17,000 8,410 5,230 4,420 5,920 6,650 7,650 11,800
12 12,700 14,200 21,000 19,000 16,900 8,350 4,910 4,440 5,160 5,460 6,900 12,700
13 12,100 14,300 21,300 18,900 17,200 8,930 5,040 4,740 4,340 4,650 6,900 12,200
14 12,300 15,300 22,400 19,900 16,900 9,650 5,230 5,250 4,160 4,810 7,450 11,700
15 12,300 16,900 24,300 20,900 15,800 9,850 4,990 5,340 4,430 5,050 7,460 11,300
16 11,900 17,300 24,800 20,800 16,000 8,520 4,780 4,540 4,300 6,840 7,440 11,600
17 12,600 16,000 23,200 21,700 17,300 7,550 4,570 4,050 4,240 9,090 7,100 12,400
18 12,300 15,600 22,200 23,100 17,500 7,290 4,470 4,420 4,650 7,010 7,180 12,200
19 11,800 16,400 24,400 20,800 17,900 7,320 4,870 5,810 6,350 6,040 6,980 11,200
20 13,400 17,100 23,300 17,900 17,000 8,860 4,650 6,450 6,850 6,240 6,870 10,600
21 15,400 17,600 24,800 18,700 15,200 8,080 4,870 5,180 6,020 5,710 7,320 10,500
22 14,300 17,600 26,600 19,200 14,600 9,570 4,780 4,460 4,890 5,570 8,170 10,400
23 13,200 18,300 27,200 17,900 14,600 10,800 4,540 4,420 5,300 5,640 8,650 11,000
24 13,400 19,100 25,500 17,000 14,500 11,200 4,610 4,690 5,860 5,600 8,390 11,200
25 14,900 21,000 24,500 16,000 13,500 8,990 4,450 4,890 5,680 5,690 7,900 11,300
26 16,900 21,400 23,400 16,600 12,500 7,270 4,380 4,580 6,320 5,730 8,040 11,500
27 17,200 21,400 22,100 19,300 12,000 6,540 4,110 4,850 6,480 5,820 7,790 12,000
28 17,100 21,000 21,700 20,200 11,500 6,540 3,970 4,370 5,610 5,920 8,050 12,600
29 16,300 22,300 21,700 18,600 11,400 6,880 3,970 3,790 6,010 6,630 9,100 12,200
30 15,400   23,300 18,000 11,900 6,660 3,900 3,540 6,660 7,850 9,680 12,000
31 14,600   22,900   11,700   4,210 3,340   7,630   12,800