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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
1 990 820 747 1,430 1,320 406 362 126 116 123 347 501
2 998 719 638 1,090 1,320 477 246 127 140 125 363 437
3 799 691 678 944 1,300 463 208 137 176 114 358 773
4 816 619 1,020 1,250 1,230 470 332 191 144 107 298 800
5 802 580 1,030 1,090 1,060 404 261 232 135 107 295 546
6 622 606 960 968 942 385 205 187 123 129 287 496
7 530 615 937 868 1,040 333 209 155 107 144 258 435
8 545 622 817 724 1,120 358 175 162 101 124 313 426
9 511 625 975 828 987 512 176 145 112 138 281 402
10 519 663 1,160 897 818 512 191 153 121 125 226 372
11 624 643 1,370 991 1,110 470 193 170 134 117 232 391
12 685 659 1,390 968 1,130 471 162 128 126 151 237 452
13 700 742 1,160 918 1,040 496 148 141 133 184 267 510
14 1,000 883 1,110 1,140 1,080 576 140 267 148 172 350 642
15 955 773 1,000 1,310 918 454 133 406 129 165 365 629
16 663 781 932 1,180 960 410 150 367 119 149 458 610
17 563 764 900 1,040 1,070 433 158 254 119 195 426 561
18 525 882 1,060 893 1,100 507 189 188 115 196 620 674
19 589 814 1,880 870 877 461 198 150 110 168 720 666
20 622 696 1,260 963 791 363 170 129 106 165 665 578
21 699 710 1,220 1,080 700 452 156 119 105 216 541 603
22 876 784 1,030 1,040 581 371 181 111 119 271 447 886
23 933 852 941 1,140 673 294 153 115 164 237 453 701
24 997 878 936 1,250 536 312 143 117 169 199 494 699
25 970 899 1,020 1,340 498 302 132 118 130 179 565 987
26 686 956 1,060 1,240 565 280 129 109 124 193 472 766
27 591 950 1,040 1,120 631 300 116 109 149 176 497 628
28 543 789 1,210 1,050 603 304 112 137 153 191 671 806
29 512 541 1,170 1,020 456 278 130 127 129 205 580 862
30 719   1,230 1,620 393 306 132 167 118 231 498 685
31 969   1,780   359   129 138   310   802