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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 04181500 ST. MARYS RIVER AT DECATUR, IN


Adams County, Indiana
Hydrologic Unit Code 04100004
Latitude  40°50'53", Longitude  84°56'16" NAD27
Drainage area 621  square miles
Gage datum 760.12 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 1946-10-01 -> 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
1 953 700 1,070 999 746 605 396 157 119 117 141 561
2 879 700 1,070 978 715 617 380 188 132 106 233 540
3 845 716 1,100 1,000 633 649 393 202 117 88 273 551
4 934 695 1,220 1,060 610 610 383 201 133 94 239 535
5 935 739 1,330 1,100 657 562 393 268 126 121 215 515
6 880 712 1,280 1,200 660 511 396 247 113 140 214 529
7 787 683 1,160 1,210 617 459 450 203 94 135 185 564
8 719 716 1,150 1,150 575 448 451 184 79 124 199 569
9 690 749 1,190 1,050 554 477 441 182 86 146 185 531
10 685 889 1,230 1,050 608 492 438 160 170 179 171 539
11 668 899 1,250 1,080 655 462 438 159 195 174 181 550
12 729 866 1,230 1,090 659 516 392 139 180 188 195 606
13 835 839 1,240 1,020 677 604 353 122 142 168 208 584
14 835 805 1,260 1,010 658 762 373 116 113 155 261 544
15 815 863 1,290 996 628 753 402 137 90 187 294 601
16 783 868 1,260 956 595 726 438 130 74 203 357 615
17 747 907 1,160 881 559 671 453 130 75 193 396 563
18 779 986 1,100 798 584 617 464 147 94 170 375 531
19 765 1,020 1,160 799 581 541 505 164 87 160 434 565
20 715 989 1,130 881 545 495 447 140 104 161 468 544
21 763 1,010 1,130 903 528 449 368 175 116 181 445 556
22 808 1,060 1,150 873 554 406 364 186 128 161 406 605
23 852 1,190 1,130 932 539 353 365 144 116 159 418 616
24 870 1,140 1,080 970 516 320 341 95 98 182 419 615
25 787 1,130 953 921 594 345 317 96 137 213 393 634
26 748 1,050 912 955 710 363 312 97 130 209 451 672
27 811 1,080 857 878 677 394 244 90 183 181 451 670
28 833 1,130 928 901 663 400 217 79 168 158 473 692
29 846 662 1,010 860 706 400 182 107 142 140 535 753
30 860   1,010 807 657 394 147 127 129 142 537 816
31 822   997   666   166 126   130   869