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USGS Daily Statistics for Iowa

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Boating safety tips are available from the U.S. Coast Guard.

NOTE: Station Numbers for Iowa precipitation gages have changed (see list).


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 05473065 Skunk River at Merrimac, IA


Jefferson County, Iowa
Hydrologic Unit Code 07080107
Latitude  41°05'16.6", Longitude  91°43'13.3" NAD83
Drainage area 3,237  square miles
Gage datum 576.62 feet above NGVD29
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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 2009-10-01 -> 2018-09-30)

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 1,860 1,270 1,570 2,100 5,140 7,080 5,710 2,230 2,650 2,090 1,200 2,330
2 1,640 1,530 1,590 2,190 4,800 6,950 5,600 2,070 2,760 1,870 1,150 2,120
3 1,460 1,740 1,550 2,070 4,410 6,620 5,570 2,000 2,770 1,740 1,130 1,870
4 1,400 1,510 1,500 1,950 5,860 6,020 5,270 2,200 2,870 1,630 1,110 1,650
5 1,310 1,250 1,640 2,400 6,240 5,760 5,280 2,890 2,660 1,590 1,080 1,480
6 1,240 1,090 1,550 2,840 5,670 5,510 5,890 2,900 2,500 1,510 1,060 1,350
7 1,260 1,080 1,410 2,720 4,690 5,090 7,000 2,460 2,290 1,430 1,060 1,310
8 1,380 1,200 1,480 2,580 4,310 4,640 6,470 2,470 2,120 1,330 1,050 1,230
9 1,770 1,260 2,370 2,380 3,890 4,400 6,120 2,750 2,010 1,270 1,020 1,140
10 1,910 1,320 4,620 2,360 4,050 4,650 5,630 2,860 3,200 1,200 974 1,080
11 1,730 1,240 5,540 2,810 4,560 4,890 5,520 3,400 3,450 1,200 957 1,020
12 1,490 1,220 4,910 2,880 4,630 5,420 5,080 4,470 3,310 1,160 1,010 979
13 1,310 1,130 4,200 2,490 5,250 5,780 4,690 5,540 2,910 1,180 1,040 1,010
14 1,300 1,130 3,680 2,110 5,270 6,020 4,360 6,560 2,610 1,740 1,030 2,060
15 1,350 1,160 3,600 2,570 5,410 6,690 3,630 6,970 2,450 2,430 1,040 2,420
16 1,360 1,350 3,110 3,180 5,200 8,180 3,190 5,850 1,920 2,280 1,120 2,530
17 1,420 1,810 2,440 3,400 4,700 9,090 3,070 5,090 1,490 2,170 1,170 2,620
18 1,710 2,150 2,280 4,920 4,510 8,710 2,760 4,890 1,570 2,000 1,170 2,780
19 2,100 2,350 2,160 5,820 4,550 8,710 2,410 4,520 3,320 2,000 1,220 2,960
20 2,330 3,140 1,890 6,110 4,750 8,280 2,250 4,140 3,180 1,760 1,150 3,120
21 2,130 4,560 1,760 5,410 4,520 7,610 2,380 4,370 2,950 1,500 1,070 3,270
22 1,800 4,120 1,620 4,950 4,400 7,060 2,340 3,860 2,840 1,360 1,050 3,270
23 1,690 3,200 1,580 4,730 4,430 6,970 2,340 3,560 2,190 1,280 1,110 3,220
24 1,590 2,710 1,590 4,440 4,200 6,670 2,340 3,220 2,260 1,320 1,150 3,120
25 1,520 2,390 1,690 4,290 4,090 7,950 2,660 2,910 2,420 1,240 1,190 2,840
26 1,480 2,070 1,690 4,120 5,690 6,880 3,090 2,710 2,780 1,200 1,360 2,570
27 1,480 1,800 1,640 4,310 6,610 6,850 3,080 2,440 2,730 1,190 2,480 2,430
28 1,510 1,660 1,620 4,160 6,800 6,380 2,450 2,110 2,590 1,230 2,570 2,410
29 1,440 2,300 1,590 4,060 7,510 5,930 2,120 1,930 2,400 1,280 2,610 2,480
30 1,300   1,650 4,420 7,900 5,610 2,440 1,770 2,240 1,340 2,410 2,310
31 1,260   1,940   7,710   2,390 1,980   1,270   2,130