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USGS Daily Statistics for Missouri

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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 07021000 Castor River at Zalma, MO


Bollinger County, Missouri
Hydrologic Unit Code 07140107
Latitude  37°08'47.9", Longitude  90°04'31.8" NAD83
Drainage area 423  square miles
Gage datum 350.49 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 1919-10-01 -> 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
1 993 822 744 1,410 1,320 407 362 126 116 123 347 501
2 998 720 637 1,080 1,320 477 246 127 140 125 363 437
3 799 691 676 942 1,290 462 208 137 176 114 358 773
4 814 620 1,020 1,260 1,230 469 332 191 144 107 298 793
5 802 580 1,020 1,330 1,060 406 261 232 135 107 295 542
6 630 605 955 1,230 941 392 205 187 123 129 287 493
7 537 614 932 961 1,030 370 209 155 107 144 258 433
8 549 621 813 763 1,110 380 175 162 101 124 313 423
9 513 623 969 842 983 522 176 145 112 138 281 399
10 520 661 1,150 905 814 518 191 153 121 125 226 370
11 624 640 1,360 993 1,100 474 193 170 134 117 232 389
12 683 656 1,380 967 1,120 473 162 128 126 151 237 449
13 699 739 1,150 916 1,030 499 148 141 133 184 267 506
14 999 878 1,100 1,130 1,070 583 140 267 148 172 350 637
15 950 773 997 1,300 912 460 133 406 129 165 365 625
16 660 831 928 1,170 954 410 150 367 119 149 458 611
17 562 802 897 1,030 1,070 433 158 254 119 195 426 586
18 526 893 1,050 888 1,090 507 189 188 115 196 620 693
19 597 819 1,870 865 871 461 198 150 110 168 720 680
20 626 699 1,250 961 787 363 170 129 106 165 665 585
21 700 711 1,210 1,090 697 452 156 119 105 216 541 607
22 873 783 1,030 1,050 579 371 181 111 119 271 447 884
23 929 850 935 1,140 669 294 153 115 164 237 453 700
24 992 875 930 1,250 533 312 143 117 169 199 494 697
25 964 897 1,010 1,340 496 302 132 118 130 179 565 983
26 684 953 1,050 1,230 563 280 129 109 124 192 472 768
27 589 946 1,030 1,110 627 300 116 109 149 176 497 635
28 541 787 1,200 1,050 600 304 112 137 153 191 671 813
29 510 541 1,160 1,010 455 278 130 127 129 205 580 885
30 716   1,220 1,610 396 306 132 167 118 231 498 718
31 969   1,760   363   129 138   310   815