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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 05487470 South River near Ackworth, IA


Warren County, Iowa
Hydrologic Unit Code 07100008
Latitude  41°20'16.4", Longitude  93°29'11.1" NAD83
Drainage area 460  square miles
Gage datum 769.84 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 1940-10-01 -> 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 78 183 237 434 485 367 242 88 106 85 231 138
2 86 187 296 323 440 312 198 107 64 121 167 163
3 74 106 375 338 476 300 293 75 92 143 133 90
4 69 139 382 431 422 272 416 220 94 71 103 111
5 69 172 342 378 388 706 555 112 72 87 92 155
6 146 138 288 314 485 470 509 154 73 102 107 128
7 75 151 240 287 795 249 329 136 98 102 89 79
8 65 141 353 356 638 387 435 254 101 140 58 86
9 57 136 377 362 570 707 281 115 122 318 76 75
10 56 120 562 376 514 729 300 77 379 198 128 63
11 59 121 532 475 502 510 319 98 122 252 109 71
12 96 137 478 521 560 775 404 188 140 245 128 62
13 190 180 636 410 629 792 206 71 328 101 118 93
14 88 167 503 429 470 609 168 81 251 269 100 283
15 114 165 510 517 468 615 192 120 232 136 86 137
16 119 166 487 668 397 621 359 69 276 68 173 87
17 130 185 523 488 574 596 265 53 140 54 189 77
18 101 311 471 884 424 467 358 73 143 101 119 71
19 106 368 689 623 336 517 370 193 125 68 94 64
20 122 393 546 465 384 428 397 178 172 66 127 68
21 103 275 331 510 524 516 262 116 196 87 97 64
22 80 213 366 483 582 539 156 86 122 146 81 65
23 89 233 400 408 424 354 115 297 232 234 79 113
24 78 266 484 414 410 306 136 391 182 213 90 198
25 76 249 467 651 807 716 159 243 291 139 107 131
26 97 208 445 426 667 498 143 424 204 95 102 103
27 130 241 418 654 523 520 214 302 113 72 146 190
28 102 298 476 456 536 278 408 147 69 82 157 224
29 97 164 511 393 779 272 517 125 80 89 105 150
30 105   665 434 498 269 153 70 103 96 111 225
31 98   595   382   148 65   170   120