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USGS Daily Statistics for Iowa

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NOTE: Station Numbers for Iowa precipitation gages have changed (see list).


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 06483290 Rock River below Tom Creek at Rock Rapids, IA


Lyon County, Iowa
Hydrologic Unit Code 10170204
Latitude  43°25'23.3", Longitude  96°09'53.7" NAD83
Drainage area 853  square miles
Gage datum 1,308.76 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 2000-10-01 -> 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
1 205 157 326 899 831 798 631 228 134 313 292 239
2 200 155 361 877 867 743 631 222 126 313 283 234
3 189 148 351 841 813 697 605 223 125 349 274 222
4 178 143 335 750 744 642 589 227 141 410 268 226
5 172 135 369 663 748 699 628 239 152 448 264 223
6 164 138 415 625 795 848 776 219 153 481 263 220
7 161 139 432 781 823 736 785 226 139 500 258 213
8 164 133 440 1,040 787 679 687 215 137 490 251 211
9 155 132 483 836 738 650 577 191 152 459 247 206
10 145 201 497 754 728 634 536 205 162 480 238 203
11 144 198 477 768 737 621 570 279 193 483 232 212
12 140 192 592 776 767 635 537 241 268 452 226 220
13 134 194 777 777 786 1,060 540 202 479 395 230 219
14 133 182 1,440 762 745 992 559 181 675 366 239 221
15 131 170 1,500 725 689 1,070 599 184 436 359 242 224
16 127 162 1,320 707 649 1,680 601 191 416 363 237 221
17 129 165 1,320 751 651 1,920 525 240 390 362 237 212
18 127 172 1,250 783 674 1,450 418 275 311 350 252 199
19 131 176 1,210 752 630 1,160 374 295 269 338 273 187
20 148 198 1,180 729 602 899 389 302 409 330 269 198
21 166 213 1,180 765 679 1,140 390 304 466 325 255 194
22 170 218 1,140 780 692 1,400 382 289 455 337 247 187
23 166 234 1,010 804 653 1,370 352 262 540 356 242 185
24 153 248 943 782 660 1,180 352 229 708 359 254 177
25 143 238 860 732 694 1,060 416 196 978 345 250 180
26 139 205 738 699 670 1,050 349 174 716 335 234 192
27 142 201 670 697 787 964 314 158 565 326 223 200
28 141 202 714 740 937 909 315 152 446 319 237 194
29 149 525 858 753 896 778 305 151 375 317 248 182
30 152   862 763 896 673 278 151 335 313 245 194
31 156   856   886   251 145   303   213