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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
1 928 697 1,060 999 753 611 400 149 119 117 143 568
2 868 702 1,070 969 722 624 384 181 132 106 236 546
3 842 719 1,110 962 638 657 397 196 117 88 276 558
4 933 697 1,230 1,020 607 616 387 198 133 94 242 541
5 934 743 1,340 1,060 640 569 397 269 126 121 218 521
6 880 716 1,280 1,140 623 516 400 248 113 140 216 536
7 791 686 1,170 1,150 577 464 455 203 94 135 187 571
8 725 722 1,160 1,090 546 452 456 184 79 124 201 576
9 697 755 1,200 1,010 535 481 446 182 86 146 187 538
10 692 898 1,240 1,020 591 497 443 160 170 179 173 545
11 676 908 1,270 1,070 643 467 443 159 195 174 182 557
12 738 875 1,240 1,090 653 521 396 139 180 188 197 614
13 845 848 1,250 1,030 677 610 357 122 142 168 210 591
14 845 814 1,270 1,020 658 770 377 116 113 155 264 550
15 825 873 1,300 1,010 623 758 407 137 90 187 297 607
16 792 877 1,250 965 590 732 444 130 74 203 361 620
17 756 916 1,150 889 556 677 458 130 75 193 400 566
18 788 996 1,100 806 583 622 470 147 94 170 379 536
19 774 1,020 1,160 807 584 540 511 164 87 160 439 570
20 723 998 1,130 890 549 491 452 140 104 161 473 549
21 772 1,020 1,140 911 531 449 372 175 116 181 450 562
22 818 1,070 1,160 881 556 407 368 186 128 161 411 611
23 862 1,200 1,140 941 540 354 369 144 116 161 423 623
24 880 1,150 1,100 980 517 322 345 95 98 184 424 622
25 796 1,130 962 930 598 348 320 96 137 215 398 642
26 757 1,050 922 960 715 366 315 97 130 211 457 680
27 821 1,080 866 884 683 398 246 90 183 183 457 678
28 844 1,120 938 909 670 404 217 79 168 160 479 701
29 856 662 1,020 867 713 405 181 107 142 141 542 755
30 870   1,020 814 664 397 145 127 129 144 544 808
31 828   993   673   165 126   132   859