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USGS Daily Statistics for Illinois

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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 05573540 SANGAMON RIVER AT ROUTE 48 AT DECATUR, IL


Macon County, Illinois
Hydrologic Unit Code 07130006
Latitude  39°49'52", Longitude  88°58'35" NAD83
Drainage area 938  square miles
Contributing drainage area 938.00  square miles
Gage datum 583.17 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 1982-10-01 -> 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 1,170 652 1,070 1,230 1,450 1,070 796 207 126 106 407 800
2 1,080 608 1,050 1,160 1,520 1,010 693 137 127 111 389 820
3 863 599 1,050 1,140 1,510 1,080 651 128 105 130 420 832
4 837 677 1,040 1,200 1,580 1,290 612 97 121 128 439 840
5 966 853 995 1,070 1,490 1,350 614 112 154 118 424 737
6 896 961 997 1,040 1,240 1,290 527 81 87 90 381 667
7 823 967 1,020 1,070 1,170 1,330 440 84 89 108 341 701
8 752 981 1,040 1,070 1,260 1,140 426 73 117 105 322 702
9 683 1,000 1,030 966 1,320 1,020 508 65 104 178 257 625
10 656 916 1,210 925 1,280 903 502 61 111 185 241 644
11 826 749 1,160 986 1,300 942 526 53 125 191 234 701
12 933 717 1,230 1,120 1,430 1,010 593 53 160 201 261 711
13 1,030 877 1,330 1,080 1,340 1,170 664 100 136 187 310 724
14 942 831 1,340 1,290 1,470 1,180 606 107 374 215 348 660
15 905 787 1,220 1,430 1,340 1,190 628 145 403 197 384 599
16 872 720 1,150 1,300 1,500 1,160 671 137 335 208 430 675
17 818 801 1,080 1,170 1,600 1,010 509 202 305 203 531 657
18 708 847 1,000 1,080 1,560 967 390 179 280 216 573 625
19 693 764 1,070 1,160 1,620 1,000 324 188 231 213 654 548
20 667 823 1,100 1,220 1,460 1,140 300 117 194 233 655 492
21 679 1,070 1,070 1,200 1,330 1,010 229 76 160 252 665 501
22 667 1,150 1,000 1,210 1,190 1,010 255 71 121 218 596 540
23 716 1,260 947 1,110 1,080 1,100 242 67 104 234 565 585
24 795 1,350 897 970 1,010 954 200 66 101 263 529 695
25 798 1,470 866 993 1,060 808 270 71 104 334 550 818
26 755 1,450 881 1,020 1,270 851 374 80 101 299 586 796
27 734 1,350 949 1,010 1,270 818 396 141 102 363 606 999
28 749 1,250 1,090 1,110 1,320 916 396 168 103 439 710 1,110
29 696 459 1,140 1,150 1,300 816 351 180 99 422 717 1,280
30 640   1,100 1,330 1,190 848 293 139 115 416 746 1,340
31 656   1,240   1,130   253 130   474   1,240