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USGS Surface-Water 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 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
1 205 157 326 865 831 798 631 228 134 313 292 239
2 200 155 361 845 867 743 631 222 126 313 283 234
3 189 148 351 811 813 697 605 223 125 349 274 222
4 178 143 335 724 744 642 589 227 141 410 268 226
5 172 135 369 641 748 699 628 239 152 448 264 223
6 164 138 400 605 795 848 776 219 153 481 263 220
7 161 139 416 754 823 736 785 226 139 500 258 213
8 164 133 423 1,000 787 679 687 215 137 490 251 211
9 155 132 465 807 738 650 577 191 152 459 247 206
10 145 201 478 729 728 634 536 205 162 480 238 203
11 144 198 459 743 737 621 570 279 193 483 232 212
12 140 192 569 750 767 635 537 241 268 452 226 220
13 134 194 746 751 786 1,060 540 202 479 395 230 219
14 133 182 1,380 735 745 992 559 181 675 366 239 221
15 131 170 1,430 700 689 1,070 599 184 436 359 242 224
16 127 162 1,260 684 649 1,680 601 191 416 363 237 221
17 129 165 1,270 731 651 1,920 525 240 390 362 237 212
18 127 172 1,200 766 674 1,450 418 275 311 350 252 199
19 131 176 1,160 737 630 1,160 374 295 269 338 273 187
20 148 198 1,130 713 602 899 389 302 409 330 269 198
21 166 213 1,130 746 679 1,140 390 304 466 325 255 194
22 170 218 1,090 758 692 1,400 382 289 455 337 247 187
23 166 234 967 780 653 1,370 352 262 540 356 242 185
24 153 248 904 782 660 1,180 352 229 708 359 254 177
25 143 238 827 732 694 1,060 416 196 978 345 250 180
26 139 205 710 699 670 1,050 349 174 716 335 234 192
27 142 201 644 697 787 964 314 158 565 326 223 200
28 141 202 688 740 937 909 315 152 446 319 237 194
29 149 525 826 753 896 778 305 151 375 317 248 182
30 152   830 763 896 673 278 151 335 313 245 194
31 156   824   886   251 145   303   213