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USGS Daily Statistics for the Nation

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 01638500 POTOMAC RIVER AT POINT OF ROCKS, MD


Frederick County, Maryland
Hydrologic Unit Code 02070008
Latitude  39°16'24.9", Longitude  77°32'35.2" NAD83
Drainage area 9,651  square miles
Gage datum 199.92 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 1894-10-01 -> 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 11,100 11,800 17,800 18,000 13,900 9,860 5,900 4,180 4,040 5,900 4,870 7,750
2 10,900 11,200 18,800 17,200 13,800 9,860 5,190 4,120 3,950 5,210 4,560 8,400
3 11,500 12,200 17,400 17,100 12,500 10,600 4,880 3,940 3,560 5,100 4,560 8,440
4 11,800 12,600 16,500 16,100 12,700 11,400 4,590 3,990 3,290 5,090 4,830 7,620
5 11,500 12,800 17,300 16,000 12,700 10,300 4,670 4,160 3,250 4,440 5,200 8,250
6 10,900 13,000 20,600 16,700 13,800 9,580 4,780 4,190 3,520 4,060 6,480 8,760
7 10,600 12,500 20,200 16,400 14,300 9,090 4,910 4,030 5,100 4,370 6,650 8,010
8 10,600 12,800 19,300 15,400 14,600 8,480 4,810 4,350 6,280 4,270 5,580 7,940
9 10,700 12,200 18,100 15,800 15,700 8,040 4,560 4,050 4,800 4,070 5,900 8,690
10 10,200 11,700 17,600 16,400 15,300 7,630 4,540 3,830 4,570 4,810 6,360 8,420
11 9,700 11,600 17,500 16,900 13,900 7,350 4,720 4,470 4,460 4,840 6,090 8,950
12 10,000 12,100 18,100 16,300 14,000 7,490 4,590 4,530 3,730 3,960 5,330 9,430
13 11,100 12,800 18,800 15,500 15,400 7,670 4,710 4,300 3,400 3,720 5,240 9,070
14 11,300 13,200 20,000 16,300 15,100 8,180 4,680 4,650 3,480 3,680 5,680 9,010
15 10,400 14,200 21,200 17,800 13,400 8,220 4,690 4,470 3,430 4,020 5,560 9,180
16 10,200 15,000 21,300 19,000 12,500 7,510 4,560 4,110 3,220 6,020 5,740 9,970
17 10,700 14,100 19,900 20,400 13,500 7,860 4,260 3,910 3,360 6,620 5,860 10,400
18 10,300 13,800 19,800 20,700 13,800 8,340 4,370 4,430 3,910 4,690 6,340 9,580
19 10,100 13,800 20,700 16,800 13,800 8,180 4,430 5,220 5,200 4,880 6,240 9,080
20 11,900 14,100 19,500 14,800 13,000 8,310 4,180 5,350 5,160 6,090 6,170 8,460
21 12,900 14,500 21,200 15,500 12,200 7,420 4,120 4,330 4,540 5,690 6,430 8,070
22 12,200 14,800 21,800 16,800 12,100 8,310 4,090 4,450 3,860 5,400 6,700 8,370
23 12,200 16,900 21,800 15,800 13,200 9,510 4,060 4,160 4,030 6,140 6,640 8,820
24 12,100 17,300 20,200 14,300 12,700 8,930 4,190 3,900 4,350 5,450 6,200 9,200
25 13,100 17,900 19,800 13,500 11,500 7,380 4,140 4,040 4,610 4,940 6,030 9,490
26 13,800 18,300 18,800 14,300 10,400 6,490 4,790 4,100 4,790 5,090 6,280 9,670
27 13,800 19,600 17,600 16,100 9,900 5,810 4,270 4,220 4,580 5,090 6,080 10,100
28 13,300 18,700 17,900 15,800 9,600 5,870 3,860 4,080 4,190 4,890 6,480 10,500
29 12,600 17,700 19,200 15,100 9,950 6,210 3,720 3,770 4,760 5,480 7,040 9,650
30 11,700   20,600 14,400 10,000 6,510 3,850 3,520 5,100 5,920 7,210 10,100
31 11,600   19,600   9,600   4,020 3,650   5,720   11,400