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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
1 205 157 326 865 831 811 677 229 132 313 292 239
2 200 155 361 845 864 772 674 222 125 313 283 234
3 189 148 351 811 813 724 642 223 124 349 274 222
4 178 143 335 724 746 668 622 226 139 410 268 226
5 172 135 369 641 746 719 655 237 149 448 264 223
6 164 138 400 605 789 858 793 218 150 481 263 220
7 161 139 416 754 825 746 799 224 137 500 258 213
8 164 133 423 1,000 799 687 708 213 134 490 251 211
9 155 132 465 807 758 656 604 189 149 459 247 206
10 145 201 478 729 745 637 557 202 159 480 238 203
11 144 198 459 743 750 621 588 273 188 483 232 212
12 140 192 569 750 774 631 555 236 260 452 226 220
13 134 194 746 751 788 1,040 554 200 462 395 230 219
14 133 182 1,380 735 745 970 569 179 650 366 239 221
15 131 170 1,430 700 688 1,040 605 183 421 359 242 224
16 127 162 1,260 684 648 1,630 605 190 401 363 237 221
17 129 165 1,270 731 649 1,860 529 237 390 362 237 212
18 127 172 1,200 766 669 1,460 426 269 311 350 252 199
19 131 176 1,160 737 623 1,210 381 289 269 338 273 187
20 148 198 1,130 713 595 979 393 295 409 330 269 198
21 166 213 1,130 746 670 1,870 393 297 466 325 255 194
22 170 218 1,090 758 686 2,660 384 282 455 337 247 187
23 166 234 967 780 654 2,100 355 256 540 356 242 185
24 153 248 904 758 674 1,650 354 225 708 359 254 177
25 143 238 827 709 718 1,320 415 192 978 345 250 180
26 139 205 710 679 690 1,180 350 171 716 335 234 192
27 142 201 644 677 795 1,030 315 156 565 326 223 200
28 141 202 688 720 935 970 315 150 446 319 237 194
29 149 525 826 740 891 840 304 150 375 317 248 182
30 152   830 762 887 727 277 149 335 313 245 194
31 156   824   879   251 144   303   213