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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 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 -> 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 5,380 4,900 8,580 10,900 9,030 7,290 7,320 4,810 4,250 4,430 4,840 5,230
2 5,360 4,780 8,620 11,000 8,950 7,310 7,380 4,710 4,180 4,360 5,040 5,230
3 5,190 4,780 8,730 11,000 8,830 7,420 7,550 4,590 4,160 4,360 5,190 5,360
4 5,120 4,840 8,920 11,000 8,630 7,470 7,460 4,500 4,160 4,370 5,240 5,370
5 5,190 4,880 9,120 10,900 8,500 7,560 7,100 4,490 4,060 4,380 5,150 5,280
6 5,420 5,190 9,280 10,800 8,270 7,320 6,830 4,660 3,920 4,410 5,160 5,150
7 5,420 5,200 9,290 10,700 8,190 7,020 6,640 4,690 3,850 4,480 5,160 5,090
8 5,330 5,270 9,020 10,500 8,100 7,040 6,620 4,830 3,940 4,470 5,090 5,010
9 5,360 5,470 9,000 10,400 8,080 7,230 6,760 4,820 4,100 4,450 5,020 4,960
10 5,310 5,630 9,230 10,300 8,050 7,190 6,490 4,670 4,190 4,530 5,080 4,900
11 5,230 5,770 9,830 10,200 8,130 7,200 6,230 4,530 4,240 4,750 5,170 4,820
12 5,190 5,780 10,300 10,200 8,150 7,170 6,030 4,480 4,330 4,690 5,170 4,760
13 5,240 5,890 10,700 10,000 8,310 7,560 5,920 4,420 4,500 4,530 5,160 4,760
14 5,140 6,010 10,800 9,930 8,400 7,910 5,910 4,400 4,750 4,480 5,180 4,800
15 5,130 6,120 10,900 9,850 8,410 7,950 5,840 4,510 4,810 4,440 5,110 4,780
16 5,040 6,110 11,200 9,780 8,260 7,870 5,690 4,470 4,730 4,450 4,970 4,900
17 4,990 6,000 11,000 9,860 8,170 7,690 5,580 4,480 4,600 4,350 5,110 4,940
18 5,020 5,890 10,700 9,890 8,020 7,540 5,680 4,520 4,590 4,460 5,070 4,970
19 4,870 6,400 10,700 9,810 7,990 7,560 5,970 4,380 4,660 4,470 5,090 4,840
20 4,820 7,330 11,200 9,700 7,920 7,620 6,220 4,490 4,600 4,510 5,120 4,730
21 4,690 8,260 11,300 9,710 7,840 7,660 5,970 4,560 4,710 4,480 5,120 4,710
22 4,740 8,490 11,200 9,650 7,670 7,700 5,930 4,470 4,790 4,450 5,110 4,720
23 4,970 8,270 11,000 9,540 7,660 7,660 5,900 4,420 4,770 4,530 5,060 4,680
24 5,380 8,310 11,100 9,460 7,570 7,580 5,780 4,360 4,820 4,620 5,020 4,670
25 5,700 8,660 11,000 9,350 7,450 7,570 5,760 4,290 4,770 4,720 4,940 4,750
26 5,680 8,690 10,800 9,280 7,450 7,500 5,590 4,310 4,790 4,770 4,940 4,800
27 5,360 8,830 10,700 9,320 7,260 7,480 5,380 4,510 4,870 4,780 5,050 4,950
28 5,120 8,960 10,700 9,240 7,300 7,370 5,270 4,620 4,810 4,820 5,120 5,310
29 4,990 8,380 10,600 9,100 7,570 7,470 5,170 4,580 4,760 4,770 5,150 5,470
30 5,100   10,800 9,040 7,520 7,400 5,060 4,480 4,730 4,740 5,170 5,530
31 5,230   10,800   7,310   4,980 4,370   4,840   5,500