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USGS Surface-Water 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 05443500 ROCK RIVER AT COMO, IL


Whiteside County, Illinois
Hydrologic Unit Code 07090005
Latitude  41°46'20", Longitude  89°44'44" NAD83
Drainage area 8,753  square miles
Gage datum 603.13 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 1934-10-01 -> 2023-09-30)

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 5,380 4,820 8,660 10,900 9,030 7,260 7,270 4,720 4,250 4,440 4,850 5,240
2 5,350 4,700 8,710 11,000 8,950 7,280 7,340 4,620 4,180 4,370 5,070 5,240
3 5,180 4,700 8,830 11,000 8,830 7,390 7,520 4,510 4,160 4,370 5,210 5,390
4 5,110 4,770 9,020 10,900 8,640 7,450 7,420 4,430 4,170 4,390 5,250 5,390
5 5,200 4,820 9,220 10,800 8,470 7,540 7,050 4,420 4,070 4,400 5,150 5,290
6 5,450 5,140 9,360 10,700 8,250 7,280 6,770 4,600 3,930 4,430 5,170 5,170
7 5,440 5,170 9,330 10,600 8,160 6,960 6,580 4,640 3,850 4,510 5,170 5,110
8 5,360 5,240 9,060 10,400 8,040 6,990 6,560 4,780 3,950 4,500 5,100 5,020
9 5,390 5,460 9,050 10,300 8,030 7,190 6,700 4,770 4,110 4,480 5,040 4,960
10 5,330 5,620 9,280 10,200 8,000 7,140 6,430 4,630 4,210 4,560 5,090 4,880
11 5,250 5,780 9,880 10,100 8,090 7,160 6,160 4,490 4,250 4,790 5,180 4,820
12 5,200 5,790 10,400 10,100 8,120 7,140 5,950 4,440 4,350 4,710 5,170 4,740
13 5,260 5,910 10,800 10,000 8,300 7,530 5,850 4,380 4,530 4,560 5,160 4,760
14 5,170 6,030 10,900 9,890 8,380 7,890 5,830 4,360 4,780 4,490 5,190 4,810
15 5,160 6,150 11,000 9,820 8,400 7,930 5,670 4,470 4,840 4,430 5,120 4,790
16 5,060 6,130 11,300 9,770 8,250 7,860 5,460 4,420 4,760 4,420 4,990 4,900
17 5,010 6,020 11,100 9,840 8,160 7,680 5,320 4,430 4,630 4,320 5,120 4,940
18 5,040 5,910 10,800 9,870 7,990 7,530 5,450 4,480 4,620 4,440 5,080 4,970
19 4,890 6,430 10,800 9,780 7,970 7,550 5,780 4,350 4,690 4,460 5,100 4,840
20 4,840 7,380 11,300 9,680 7,900 7,620 6,090 4,470 4,630 4,500 5,130 4,730
21 4,710 8,330 11,400 9,700 7,830 7,660 5,850 4,540 4,740 4,490 5,120 4,720
22 4,750 8,570 11,200 9,660 7,670 7,700 5,810 4,460 4,820 4,450 5,110 4,730
23 4,990 8,350 11,100 9,540 7,650 7,630 5,790 4,400 4,800 4,530 5,050 4,690
24 5,400 8,390 11,200 9,460 7,570 7,510 5,680 4,340 4,840 4,630 5,010 4,670
25 5,710 8,750 11,100 9,360 7,440 7,490 5,650 4,280 4,770 4,740 4,920 4,750
26 5,680 8,790 10,800 9,280 7,440 7,410 5,480 4,320 4,790 4,800 4,920 4,810
27 5,330 8,920 10,700 9,330 7,230 7,410 5,280 4,510 4,870 4,810 5,050 4,960
28 5,070 9,060 10,700 9,250 7,270 7,300 5,170 4,630 4,810 4,830 5,120 5,320
29 4,910 8,540 10,600 9,110 7,540 7,420 5,080 4,590 4,770 4,790 5,150 5,480
30 5,020   10,800 9,040 7,500 7,350 4,960 4,490 4,740 4,750 5,180 5,530
31 5,160   10,800   7,280   4,880 4,370   4,860   5,490