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USGS Daily Statistics for the Nation

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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 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 -> 2026-09-30)

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
1 199 152 316 835 806 784 707 240 130 292 274 226
2 195 150 350 818 837 746 694 230 123 292 266 227
3 184 143 341 789 787 700 652 228 122 325 258 216
4 173 138 326 710 722 646 625 228 137 381 251 220
5 168 130 357 629 722 696 652 238 147 416 248 216
6 159 134 387 592 763 829 782 221 147 446 247 214
7 157 135 404 733 797 721 785 229 134 464 243 208
8 159 129 410 972 772 664 695 226 132 454 236 206
9 151 128 449 782 732 634 592 202 146 426 232 201
10 141 194 463 707 719 616 548 210 155 445 224 198
11 141 192 444 719 724 600 577 275 183 448 218 206
12 136 185 550 726 746 611 545 238 252 419 213 214
13 131 187 719 726 760 1,000 542 200 446 367 217 213
14 130 176 1,320 711 719 936 555 180 626 340 225 214
15 127 165 1,380 677 664 1,000 588 182 407 334 229 217
16 124 156 1,220 662 625 1,570 589 188 388 338 224 215
17 126 160 1,220 706 626 1,800 517 233 364 337 223 206
18 124 167 1,150 740 646 1,410 422 268 292 326 238 194
19 128 170 1,110 712 602 1,170 380 289 252 315 259 182
20 144 191 1,090 688 576 945 391 295 381 307 256 192
21 161 206 1,090 720 648 1,800 389 294 434 303 243 188
22 165 211 1,050 731 669 2,560 379 279 423 314 236 182
23 161 227 931 752 641 2,020 351 252 502 332 230 181
24 148 241 870 732 659 1,590 349 222 656 335 241 173
25 138 231 796 686 700 1,270 409 190 905 322 237 176
26 135 201 684 658 672 1,140 350 169 663 313 222 187
27 138 197 621 658 772 998 313 155 525 304 211 195
28 137 198 663 699 904 938 314 149 415 297 224 190
29 144 525 795 718 862 817 306 148 349 296 235 178
30 147   800 739 858 721 285 147 313 292 232 190
31 151   794   850   260 141   284   208