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USGS Surface-Water Daily Statistics for Indiana

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NOTE: USGS Indiana historic, recent, and real-time data will continue to be provided in Eastern Standard Time.


NOTE: During winter months, stage and discharge may be affected by ice. Click here for more information.

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 -> 2024-09-30)

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 1,060 998 746 616 403 151 120 118 143 568
2 868 702 1,070 922 720 629 387 183 133 107 236 546
3 842 719 1,110 896 637 662 400 197 119 88 276 558
4 933 697 1,230 959 609 620 391 199 134 95 242 541
5 934 743 1,340 994 644 572 401 272 127 122 218 521
6 880 716 1,300 1,080 628 520 402 251 115 142 216 536
7 791 686 1,180 1,110 582 467 459 205 95 137 187 571
8 725 722 1,170 1,070 551 454 461 185 79 125 201 576
9 697 755 1,210 1,000 537 484 451 184 87 148 187 538
10 692 898 1,240 1,020 587 501 446 162 172 181 173 545
11 676 908 1,270 1,050 639 472 443 161 197 176 182 557
12 738 875 1,250 1,050 650 526 395 141 182 190 197 614
13 845 848 1,250 981 674 617 355 123 144 170 210 591
14 845 814 1,270 976 656 779 374 118 114 157 264 550
15 825 873 1,290 963 625 767 404 139 91 189 297 607
16 792 877 1,230 932 594 741 444 131 75 205 361 620
17 756 916 1,140 872 560 685 461 131 76 195 400 566
18 788 996 1,090 800 588 630 474 149 95 172 379 536
19 774 1,020 1,160 803 589 547 517 166 88 162 439 570
20 723 998 1,130 887 553 497 457 142 105 163 473 549
21 772 1,020 1,150 912 536 454 376 176 117 183 450 562
22 818 1,070 1,170 884 561 411 372 188 130 163 411 611
23 862 1,200 1,150 946 545 358 373 145 117 161 423 623
24 880 1,150 1,110 977 522 325 349 95 99 184 424 622
25 796 1,130 973 934 604 352 324 97 138 215 398 642
26 757 1,050 932 968 722 370 319 98 132 211 457 680
27 821 1,080 875 891 685 401 249 91 184 183 457 678
28 844 1,120 949 917 672 407 220 79 169 160 479 701
29 856 662 1,030 875 711 408 183 108 143 141 542 755
30 870   1,030 805 666 400 147 128 130 144 544 808
31 828   1,000   677   166 127   132   859