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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 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 -> 2022-09-30)

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 11,700 17,800 17,900 13,900 9,850 5,900 4,180 4,060 5,900 4,930 7,720
2 10,900 11,200 18,800 17,100 13,700 9,840 5,190 4,120 4,170 5,210 4,640 8,360
3 11,500 12,100 17,400 17,000 12,500 10,600 4,880 3,940 3,950 5,090 4,610 8,400
4 11,800 12,600 16,400 16,100 12,600 11,400 4,590 3,990 3,450 5,080 4,860 7,590
5 11,500 13,000 17,200 16,000 12,700 10,200 4,670 4,160 3,340 4,430 5,220 8,210
6 10,900 13,200 20,500 16,700 13,800 9,550 4,780 4,190 3,570 4,060 6,480 8,720
7 10,500 12,700 20,100 16,400 14,500 9,090 4,910 4,030 5,120 4,370 6,640 7,970
8 10,600 12,800 19,200 15,500 15,200 8,480 4,810 4,350 6,280 4,260 5,570 7,900
9 10,700 12,200 18,000 16,000 16,200 8,040 4,560 4,050 4,810 4,070 5,890 8,640
10 10,200 11,700 17,500 16,500 15,500 7,630 4,540 3,810 4,600 4,810 6,340 8,370
11 9,670 11,600 17,500 16,900 14,100 7,350 4,720 4,450 4,480 4,830 6,070 8,900
12 9,990 12,100 18,100 16,300 14,100 7,490 4,590 4,510 3,740 3,960 5,320 9,370
13 11,000 12,800 18,800 15,600 15,400 7,670 4,710 4,280 3,420 3,720 5,250 9,020
14 11,300 13,200 19,900 16,300 15,100 8,180 4,680 4,620 3,490 3,680 5,710 8,960
15 10,300 14,200 21,100 17,800 13,400 8,220 4,690 4,450 3,430 4,020 5,580 9,120
16 10,200 15,000 21,200 18,900 12,500 7,510 4,560 4,090 3,230 6,000 5,750 9,910
17 10,700 14,000 19,800 20,300 13,500 7,860 4,260 3,900 3,370 6,590 5,870 10,300
18 10,200 13,800 19,800 20,600 13,800 8,340 4,370 4,420 3,910 4,680 6,340 9,520
19 10,100 13,700 20,600 16,800 13,800 8,180 4,430 5,200 5,190 4,870 6,230 9,030
20 11,800 14,100 19,400 14,700 13,000 8,310 4,180 5,340 5,150 6,070 6,160 8,420
21 12,800 14,500 21,100 15,500 12,200 7,420 4,120 4,330 4,530 5,670 6,410 8,020
22 12,100 14,800 21,700 16,800 12,100 8,310 4,090 4,440 3,850 5,380 6,690 8,320
23 12,200 16,900 21,600 15,700 13,200 9,510 4,060 4,150 4,070 6,110 6,630 8,770
24 12,100 17,200 20,100 14,300 12,600 8,930 4,190 3,890 4,510 5,420 6,180 9,150
25 13,100 17,800 19,700 13,500 11,400 7,380 4,140 4,030 4,800 4,930 6,010 9,430
26 13,700 18,200 18,700 14,300 10,400 6,490 4,790 4,080 4,900 5,070 6,260 9,620
27 13,700 19,600 17,600 16,000 9,880 5,810 4,270 4,210 4,650 5,070 6,060 10,100
28 13,200 18,700 17,900 15,700 9,600 5,870 3,860 4,070 4,230 4,870 6,460 10,400
29 12,500 17,700 19,100 15,100 9,950 6,210 3,720 3,760 4,780 5,470 7,020 9,590
30 11,700   20,500 14,300 10,000 6,510 3,850 3,510 5,110 5,910 7,180 10,000
31 11,500   19,500   9,610   4,020 3,650   5,730   11,400