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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 -> 2019-09-30)

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 17,600 18,200 13,700 9,900 5,930 4,210 4,040 5,960 4,770 7,710
2 10,700 11,300 18,300 17,300 13,400 9,910 5,200 4,150 3,930 5,250 4,460 8,340
3 11,300 12,300 17,100 17,200 12,300 10,700 4,860 3,960 3,510 5,130 4,450 8,340
4 11,600 12,700 16,200 16,200 12,600 11,500 4,590 4,000 3,250 5,120 4,720 7,530
5 11,300 12,900 17,100 16,100 12,500 10,400 4,670 4,180 3,220 4,460 5,100 8,210
6 10,800 13,100 20,600 16,900 13,400 9,640 4,790 4,210 3,500 4,080 6,350 8,750
7 10,400 12,600 20,200 16,500 13,900 9,130 4,930 4,040 5,110 4,400 6,490 7,980
8 10,500 12,700 19,400 15,500 14,400 8,500 4,790 4,370 6,330 4,300 5,430 7,920
9 10,700 12,000 18,200 16,000 15,600 8,070 4,530 4,060 4,820 4,100 5,790 8,710
10 10,200 11,500 17,700 16,600 15,200 7,670 4,520 3,820 4,600 4,850 6,180 8,430
11 9,670 11,500 17,600 17,000 13,900 7,350 4,710 4,470 4,470 4,880 5,840 8,990
12 10,000 12,000 18,100 16,300 14,000 7,480 4,590 4,540 3,730 3,980 5,170 9,490
13 11,100 12,700 18,900 15,400 15,400 7,630 4,710 4,310 3,410 3,740 5,090 9,140
14 11,300 13,100 20,200 16,200 15,000 8,170 4,670 4,670 3,490 3,690 5,420 9,070
15 10,300 14,100 21,400 17,700 13,300 8,240 4,700 4,490 3,440 4,040 5,280 9,200
16 10,200 15,000 21,500 18,900 12,400 7,520 4,570 4,110 3,240 6,080 5,500 9,560
17 10,700 14,000 20,100 20,300 13,500 7,900 4,280 3,900 3,380 6,680 5,610 9,370
18 10,300 13,700 20,000 20,700 13,900 8,400 4,390 4,390 3,930 4,730 6,090 9,030
19 10,200 13,700 20,900 16,800 13,900 8,240 4,440 5,190 5,250 4,920 6,000 8,720
20 11,900 14,100 19,700 14,700 13,100 8,380 4,190 5,350 5,210 6,150 5,950 8,210
21 12,700 14,600 21,400 15,300 12,300 7,370 4,140 4,320 4,580 5,740 6,210 7,840
22 12,000 14,800 21,900 16,700 12,200 8,280 4,110 4,450 3,880 5,450 6,500 7,940
23 12,200 16,900 21,800 15,700 13,300 9,530 4,060 4,160 4,060 6,200 6,500 8,250
24 12,100 17,200 20,300 14,300 12,800 8,960 4,200 3,900 4,390 5,490 6,070 8,810
25 13,000 17,700 19,900 13,500 11,500 7,390 4,150 4,030 4,650 4,980 5,820 9,040
26 13,400 17,900 19,000 14,400 10,400 6,500 4,800 4,100 4,840 5,120 5,990 9,070
27 13,400 19,500 17,800 16,100 9,930 5,810 4,280 4,220 4,630 5,110 5,850 9,710
28 13,100 18,600 18,100 15,800 9,640 5,880 3,870 4,080 4,220 4,890 6,320 10,200
29 12,500 18,100 19,300 15,100 10,000 6,240 3,730 3,780 4,810 5,480 6,950 9,380
30 11,600   20,800 14,300 10,100 6,560 3,880 3,510 5,150 5,910 7,140 9,790
31 11,500   19,800   9,630   4,050 3,650   5,700   11,300