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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 05437500 ROCK RIVER AT ROCKTON, IL


Winnebago County, Illinois
Hydrologic Unit Code 07090005
Latitude  42°27'01", Longitude  89°04'21" NAD83
Drainage area 6,363  square miles
Gage datum 707.75 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 1939-10-01 -> 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 3,720 3,630 6,040 8,610 6,990 5,170 5,220 3,570 3,240 3,540 3,760 3,830
2 3,670 3,630 6,120 8,610 6,930 5,250 5,180 3,490 3,200 3,590 3,890 3,850
3 3,650 3,660 6,190 8,590 6,870 5,240 5,080 3,420 3,180 3,600 3,950 3,870
4 3,590 3,610 6,240 8,570 6,740 5,170 5,000 3,440 3,130 3,620 3,980 3,810
5 3,640 3,580 6,370 8,470 6,600 5,140 4,900 3,460 3,070 3,600 4,000 3,820
6 3,720 3,540 6,450 8,430 6,470 5,050 4,810 3,470 3,020 3,610 4,010 3,840
7 3,700 3,590 6,460 8,340 6,380 4,960 4,800 3,460 2,980 3,670 3,980 3,780
8 3,720 3,610 6,440 8,250 6,300 4,940 4,660 3,450 3,010 3,660 3,870 3,780
9 3,720 3,650 6,520 8,160 6,230 4,970 4,570 3,430 3,100 3,640 3,860 3,750
10 3,710 3,760 6,730 8,030 6,230 5,000 4,480 3,400 3,120 3,670 3,870 3,710
11 3,660 3,750 6,940 7,950 6,300 5,000 4,440 3,410 3,100 3,670 3,900 3,630
12 3,620 3,790 7,060 7,890 6,220 5,070 4,350 3,390 3,170 3,610 3,890 3,610
13 3,620 3,840 7,390 7,820 6,190 5,230 4,260 3,320 3,320 3,530 3,860 3,620
14 3,570 3,890 7,670 7,770 6,160 5,330 4,200 3,270 3,460 3,530 3,880 3,560
15 3,530 3,880 7,890 7,720 6,100 5,340 4,140 3,210 3,390 3,530 3,830 3,590
16 3,490 3,850 8,070 7,670 6,040 5,340 4,060 3,180 3,380 3,520 3,810 3,640
17 3,550 3,900 8,120 7,630 5,990 5,340 3,980 3,160 3,370 3,490 3,860 3,660
18 3,580 3,920 8,040 7,560 5,970 5,340 3,970 3,110 3,400 3,520 3,900 3,640
19 3,520 4,120 8,190 7,490 5,890 5,380 4,040 3,110 3,410 3,530 3,890 3,600
20 3,550 4,540 8,450 7,490 5,800 5,400 4,140 3,210 3,410 3,550 3,880 3,570
21 3,500 4,860 8,480 7,570 5,710 5,340 4,130 3,200 3,430 3,540 3,870 3,620
22 3,570 4,910 8,450 7,530 5,660 5,370 4,060 3,190 3,480 3,550 3,850 3,610
23 3,720 5,040 8,480 7,460 5,620 5,380 4,010 3,160 3,540 3,620 3,810 3,590
24 3,770 5,260 8,560 7,390 5,540 5,330 3,990 3,140 3,520 3,670 3,740 3,580
25 3,760 5,480 8,680 7,330 5,430 5,300 3,960 3,150 3,580 3,700 3,750 3,570
26 3,750 5,620 8,650 7,280 5,350 5,390 3,960 3,270 3,610 3,740 3,750 3,610
27 3,670 5,830 8,630 7,210 5,290 5,320 4,010 3,420 3,600 3,780 3,810 3,700
28 3,600 5,940 8,580 7,140 5,290 5,230 3,940 3,410 3,650 3,770 3,820 3,810
29 3,580 5,970 8,550 7,090 5,280 5,230 3,850 3,420 3,650 3,770 3,810 3,860
30 3,580   8,540 7,050 5,200 5,270 3,790 3,400 3,630 3,750 3,810 3,850
31 3,600   8,540   5,160   3,700 3,300   3,730   3,830