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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 199.92 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 -> 2024-09-30)

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 11,800 17,700 17,800 13,800 9,760 5,870 4,150 4,030 5,840 4,880 7,650
2 10,800 11,200 18,700 17,000 13,800 9,750 5,170 4,090 4,130 5,170 4,590 8,280
3 11,400 12,200 17,400 17,100 12,500 10,500 4,860 3,910 3,910 5,060 4,560 8,310
4 11,700 12,600 16,500 16,500 12,600 11,300 4,580 3,960 3,420 5,060 4,810 7,520
5 11,400 12,900 17,300 16,300 12,700 10,100 4,650 4,130 3,310 4,430 5,160 8,130
6 10,900 13,100 20,500 16,800 13,800 9,450 4,750 4,160 3,550 4,060 6,400 8,630
7 10,500 12,600 20,000 16,400 14,400 8,970 4,880 4,000 5,080 4,350 6,570 7,890
8 10,500 12,700 19,100 15,600 15,100 8,370 4,780 4,330 6,250 4,240 5,510 7,820
9 10,600 12,200 18,000 16,000 16,100 7,940 4,540 4,040 4,810 4,050 5,830 8,550
10 10,300 11,600 17,600 16,500 15,400 7,540 4,520 3,800 4,600 4,770 6,270 8,290
11 10,000 11,500 17,700 16,900 14,100 7,260 4,700 4,430 4,460 4,790 6,000 8,810
12 10,200 12,000 18,100 16,200 14,100 7,400 4,570 4,500 3,740 3,930 5,280 9,290
13 11,100 12,700 18,800 15,600 15,400 7,570 4,680 4,260 3,420 3,700 5,270 8,970
14 11,400 13,200 19,900 16,400 15,100 8,060 4,660 4,600 3,490 3,650 5,760 8,900
15 10,400 14,300 21,000 17,800 13,400 8,100 4,670 4,420 3,430 3,980 5,600 9,060
16 10,200 15,000 21,100 18,900 12,500 7,410 4,530 4,060 3,230 5,940 5,750 9,860
17 10,700 14,000 19,700 20,200 13,400 7,750 4,240 3,880 3,360 6,520 5,860 10,300
18 10,200 13,800 19,600 20,400 13,700 8,220 4,340 4,380 3,880 4,640 6,340 9,560
19 10,100 13,800 20,400 16,700 13,700 8,060 4,420 5,150 5,150 4,830 6,230 9,110
20 11,800 14,200 19,200 14,600 12,900 8,190 4,170 5,290 5,110 6,000 6,140 8,490
21 12,700 14,500 20,900 15,400 12,100 7,310 4,100 4,290 4,500 5,610 6,380 8,050
22 12,000 14,700 21,500 16,600 12,000 8,180 4,070 4,410 3,830 5,320 6,650 8,310
23 12,100 16,800 21,400 15,600 13,100 9,350 4,040 4,130 4,030 6,040 6,630 8,820
24 12,000 17,100 19,900 14,200 12,500 8,860 4,170 3,860 4,480 5,370 6,200 9,300
25 13,000 17,800 19,500 13,300 11,400 7,330 4,110 4,000 4,770 4,880 6,010 9,520
26 13,600 18,100 18,600 14,200 10,300 6,470 4,750 4,050 4,880 5,020 6,240 9,640
27 13,700 19,500 17,500 15,900 9,820 5,810 4,240 4,170 4,630 5,020 6,030 10,000
28 13,300 18,600 17,800 15,600 9,530 5,860 3,830 4,030 4,210 4,820 6,410 10,400
29 12,800 17,600 19,000 14,900 9,870 6,190 3,690 3,730 4,750 5,410 6,960 9,580
30 12,000   20,300 14,200 9,960 6,480 3,830 3,480 5,070 5,840 7,110 10,000
31 11,700   19,400   9,530   3,990 3,630   5,670   11,300