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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 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 1,320 406 362 126 116 123 347 501
2 998 720 637 1,080 1,320 477 246 127 140 125 363 437
3 799 691 676 942 1,300 463 208 137 176 114 358 773
4 814 620 1,020 1,260 1,230 470 332 191 144 107 298 793
5 802 580 1,020 1,330 1,060 404 261 232 135 107 295 542
6 630 605 955 1,230 942 385 205 187 123 129 287 493
7 537 614 932 961 1,040 333 209 155 107 144 258 433
8 549 621 813 763 1,120 358 175 162 101 124 313 423
9 513 623 969 842 987 512 176 145 112 138 281 399
10 520 661 1,150 905 818 512 191 153 121 125 226 370
11 624 640 1,360 993 1,110 470 193 170 134 117 232 389
12 683 656 1,380 967 1,130 471 162 128 126 151 237 449
13 699 739 1,150 916 1,040 496 148 141 133 184 267 506
14 999 878 1,100 1,130 1,080 576 140 267 148 172 350 637
15 950 773 997 1,310 918 454 133 406 129 165 365 625
16 660 831 928 1,180 960 410 150 367 119 149 458 611
17 562 802 897 1,040 1,070 433 158 254 119 195 426 586
18 526 893 1,050 893 1,100 507 189 188 115 196 620 693
19 597 819 1,870 870 877 461 198 150 110 168 720 680
20 626 699 1,250 963 791 363 170 129 106 165 665 585
21 700 711 1,210 1,080 700 452 156 119 105 216 541 607
22 873 783 1,030 1,040 581 371 181 111 119 271 447 884
23 929 850 935 1,140 673 294 153 115 164 237 453 700
24 992 875 930 1,250 536 312 143 117 169 199 494 697
25 964 897 1,010 1,340 498 302 132 118 130 179 565 983
26 684 953 1,050 1,240 565 280 129 109 124 193 472 768
27 589 946 1,030 1,120 631 300 116 109 149 176 497 635
28 541 787 1,200 1,050 603 304 112 137 153 191 671 813
29 510 541 1,160 1,020 456 278 130 127 129 205 580 885
30 716   1,220 1,620 393 306 132 167 118 231 498 718
31 969   1,760   359   129 138   310   815