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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 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 199.91 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 -> 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 11,000 11,700 17,600 17,700 13,800 9,760 5,840 4,130 4,020 5,980 4,850 7,610
2 10,800 11,200 18,700 16,900 13,700 9,750 5,140 4,070 4,130 5,440 4,570 8,240
3 11,400 12,200 17,300 17,000 12,400 10,500 4,840 3,900 3,920 5,310 4,540 8,270
4 11,700 12,600 16,400 16,400 12,600 11,300 4,550 3,940 3,420 5,230 4,790 7,480
5 11,400 12,900 17,300 16,200 12,700 10,100 4,630 4,110 3,310 4,550 5,130 8,080
6 10,800 13,100 20,400 16,700 13,800 9,450 4,730 4,140 3,540 4,150 6,370 8,580
7 10,400 12,600 19,900 16,300 14,400 8,970 4,860 3,990 5,060 4,410 6,530 7,850
8 10,500 12,900 19,000 15,500 15,100 8,370 4,760 4,320 6,220 4,280 5,480 7,780
9 10,600 12,300 17,900 15,900 16,100 7,940 4,520 4,100 4,790 4,080 5,800 8,500
10 10,300 11,700 17,500 16,500 15,400 7,540 4,500 4,190 4,580 4,780 6,230 8,240
11 9,990 11,600 17,600 16,800 14,000 7,260 4,670 4,640 4,440 4,800 5,970 8,760
12 10,200 12,000 18,100 16,200 14,100 7,400 4,550 4,590 3,720 3,940 5,250 9,240
13 11,100 12,700 18,700 15,500 15,400 7,570 4,660 4,310 3,400 3,700 5,240 8,950
14 11,300 13,200 19,800 16,300 15,100 8,060 4,630 4,620 3,470 3,660 5,730 8,880
15 10,400 14,300 20,900 17,700 13,400 8,100 4,640 4,430 3,410 3,980 5,570 9,040
16 10,200 15,000 20,900 18,800 12,500 7,410 4,510 4,070 3,210 5,920 5,720 9,830
17 10,600 14,100 19,600 20,100 13,400 7,750 4,220 3,880 3,350 6,490 5,830 10,300
18 10,200 13,800 19,500 20,300 13,700 8,220 4,320 4,380 3,870 4,630 6,310 9,530
19 10,000 13,800 20,300 16,600 13,700 8,060 4,390 5,140 5,120 4,810 6,200 9,080
20 11,700 14,200 19,200 14,600 12,900 8,190 4,140 5,280 5,090 5,980 6,110 8,470
21 12,600 14,500 20,800 15,300 12,100 7,310 4,080 4,280 4,490 5,580 6,350 8,040
22 12,000 14,700 21,400 16,500 12,000 8,180 4,050 4,390 3,820 5,300 6,610 8,300
23 12,000 16,800 21,300 15,500 13,100 9,350 4,020 4,110 4,030 6,020 6,590 8,800
24 11,900 17,100 19,800 14,100 12,500 8,810 4,150 3,850 4,460 5,340 6,170 9,260
25 12,900 17,700 19,400 13,300 11,400 7,290 4,100 3,980 4,760 4,860 5,980 9,480
26 13,500 18,100 18,500 14,100 10,300 6,430 4,730 4,040 4,870 5,000 6,200 9,590
27 13,600 19,400 17,400 15,800 9,820 5,770 4,220 4,150 4,630 5,000 6,000 9,990
28 13,200 18,500 17,700 15,500 9,530 5,830 3,820 4,020 4,240 4,800 6,380 10,300
29 12,700 17,600 18,800 14,900 9,870 6,150 3,680 3,720 4,880 5,380 6,920 9,530
30 11,900   20,200 14,200 9,960 6,450 3,810 3,470 5,210 5,810 7,080 9,950
31 11,600   19,300   9,530   3,970 3,620   5,640   11,300