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USGS Daily Statistics for Dist. of Columbia

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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 13,700 14,400 19,000 21,800 17,200 11,400 6,530 4,920 3,720 5,980 6,600 10,300
2 13,700 13,900 19,300 21,600 16,200 11,700 5,900 5,000 4,000 5,730 6,150 11,300
3 13,900 14,200 19,800 22,200 15,000 11,400 5,740 4,640 4,270 5,820 5,920 11,600
4 13,700 15,400 19,200 21,500 14,600 12,100 5,270 4,720 3,900 5,700 5,940 10,400
5 13,100 16,600 20,000 21,300 15,300 12,500 5,160 4,630 3,770 5,330 6,340 10,300
6 12,800 16,700 22,900 21,400 17,000 11,200 5,260 4,350 4,150 5,000 7,630 11,000
7 12,700 16,300 24,100 20,800 18,200 10,700 5,140 4,210 5,590 4,970 8,760 10,300
8 12,200 15,700 23,500 19,400 18,900 9,710 5,490 4,380 7,690 5,300 7,500 9,990
9 12,700 15,200 22,500 19,400 19,100 9,010 5,380 4,560 7,220 5,020 7,840 10,900
10 13,600 14,400 20,900 19,000 19,000 8,730 5,110 4,650 5,670 6,250 8,130 11,000
11 13,000 14,300 20,800 19,100 17,000 8,410 5,230 4,420 5,920 6,650 7,710 11,900
12 12,800 14,200 21,000 19,000 16,900 8,350 4,910 4,440 5,160 5,460 6,950 12,800
13 12,200 14,300 21,300 18,900 17,200 8,930 5,040 4,740 4,340 4,650 6,950 12,300
14 12,400 15,400 22,400 19,900 16,900 9,650 5,230 5,250 4,160 4,810 7,510 11,700
15 12,400 16,900 24,300 20,900 15,800 9,850 4,990 5,340 4,430 5,060 7,520 11,400
16 12,000 17,300 24,800 20,800 16,000 8,520 4,780 4,540 4,300 6,880 7,500 11,600
17 12,700 16,000 23,200 21,700 17,300 7,550 4,570 4,050 4,240 9,150 7,160 12,500
18 12,400 15,500 22,200 23,100 17,500 7,290 4,470 4,420 4,650 7,050 7,230 12,300
19 11,900 16,300 24,400 20,800 17,900 7,320 4,870 5,810 6,350 6,070 7,030 11,200
20 13,500 17,100 23,300 17,900 17,000 8,860 4,650 6,450 6,850 6,280 6,920 10,700
21 15,500 17,700 24,800 18,700 15,200 8,080 4,870 5,180 6,020 5,750 7,370 10,500
22 14,500 17,700 26,600 19,200 14,600 9,570 4,780 4,460 4,890 5,600 8,230 10,400
23 13,300 18,400 27,200 17,900 14,600 10,800 4,540 4,420 5,300 5,670 8,720 11,000
24 13,500 19,200 25,500 17,000 14,500 11,200 4,610 4,690 5,860 5,630 8,460 11,300
25 15,000 21,100 24,500 16,000 13,500 8,990 4,450 4,890 5,680 5,730 7,960 11,300
26 17,100 21,600 23,400 16,600 12,500 7,270 4,380 4,580 6,320 5,760 8,100 11,600
27 17,300 21,400 22,100 19,300 12,000 6,540 4,110 4,850 6,480 5,860 7,850 12,100
28 17,200 21,000 21,700 20,200 11,500 6,540 3,970 4,370 5,610 5,960 8,110 12,700
29 16,500 22,300 21,700 18,600 11,400 6,880 3,970 3,790 6,010 6,680 9,170 12,300
30 15,500   23,300 18,000 11,900 6,660 3,900 3,540 6,660 7,910 9,760 12,100
31 14,700   22,900   11,700   4,210 3,340   7,690   12,900