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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 06485950 BIG SIOUX RIVER AT SIOUX CITY, IA


Woodbury County, Iowa
Hydrologic Unit Code 101702032507
Latitude  42°31'28", Longitude  96°28'48.7" NAD27
Drainage area 8,430.0  square miles
Contributing drainage area 7,546.0  square miles
Gage datum 1,060.04 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 2014-10-01 -> 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 1,560 1,190 1,640 6,150 6,270 7,450 7,320 2,110 1,850 2,910 2,730 2,290
2 1,540 1,180 1,670 6,170 6,480 7,300 6,590 2,050 1,700 2,900 2,680 2,290
3 1,520 1,170 1,700 5,890 6,440 6,950 5,940 2,010 1,630 2,790 2,640 2,200
4 1,490 1,150 1,780 5,650 6,420 6,420 5,570 2,030 1,580 2,760 2,660 2,130
5 1,470 1,140 1,880 5,550 6,230 5,870 5,270 2,020 1,710 2,900 2,660 2,060
6 1,450 1,130 2,010 5,300 5,790 5,380 4,940 2,070 1,660 3,100 2,660 1,940
7 1,430 1,110 2,110 5,010 5,390 5,050 4,840 2,070 1,650 3,350 2,680 1,830
8 1,410 1,100 2,320 4,840 5,190 4,790 5,020 2,010 1,650 3,370 2,710 1,770
9 1,360 1,110 2,450 4,910 5,050 4,650 5,190 1,990 1,590 3,320 2,730 1,710
10 1,310 1,120 2,450 5,290 4,980 4,550 4,990 2,010 1,540 3,660 2,740 1,650
11 1,260 1,130 2,430 5,760 4,890 4,540 4,500 1,880 1,580 3,770 2,720 1,610
12 1,210 1,160 2,470 5,890 5,010 4,440 4,160 1,810 1,690 3,820 2,650 1,600
13 1,180 1,250 3,090 5,950 5,310 4,170 4,050 1,790 1,900 3,970 2,540 1,620
14 1,160 1,380 4,370 5,960 5,350 4,080 4,080 1,840 2,370 4,130 2,480 1,640
15 1,140 1,380 5,240 5,960 5,450 4,200 3,850 1,890 3,010 4,140 2,490 1,640
16 1,110 1,330 6,930 5,960 5,300 4,120 3,730 1,880 3,650 3,870 2,520 1,650
17 1,080 1,300 8,200 5,890 5,140 4,290 3,670 1,840 4,460 3,600 2,560 1,630
18 1,080 1,300 7,210 5,750 5,050 4,410 3,570 1,880 4,980 3,430 2,590 1,580
19 1,090 1,310 6,350 5,770 4,940 4,390 3,510 1,940 5,020 3,300 2,610 1,570
20 1,110 1,410 5,920 5,850 5,080 4,610 3,580 1,990 4,810 3,190 2,640 1,570
21 1,150 1,560 5,650 5,920 5,130 4,870 3,450 1,970 4,790 3,070 2,720 1,560
22 1,190 1,630 5,500 5,890 5,040 5,300 3,230 2,010 4,980 2,980 2,700 1,630
23 1,290 1,710 5,480 5,840 4,950 10,300 3,110 2,030 5,210 2,910 2,630 1,640
24 1,390 1,730 5,460 5,800 5,250 14,700 3,010 2,020 5,690 2,910 2,560 1,650
25 1,390 1,710 5,640 5,910 5,360 14,500 2,880 1,990 5,730 2,910 2,480 1,580
26 1,330 1,700 5,730 6,040 5,550 13,200 2,780 1,990 5,150 2,860 2,420 1,590
27 1,250 1,740 5,680 6,060 5,930 11,100 2,690 1,900 4,390 2,810 2,320 1,630
28 1,230 1,780 5,760 6,010 6,030 9,610 2,540 1,840 3,850 2,800 2,230 1,650
29 1,220 3,210 5,900 5,910 6,240 8,930 2,430 1,800 3,460 2,730 2,260 1,660
30 1,210   5,890 5,950 6,860 8,280 2,290 1,850 3,110 2,700 2,360 1,640
31 1,200   5,920   7,270   2,180 1,900   2,730   1,600