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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 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 -> 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
1 199 152 316 835 806 784 707 229 132 302 283 232
2 195 150 350 818 837 746 694 222 125 302 275 227
3 184 143 341 789 787 700 652 223 124 337 266 216
4 173 138 326 710 722 646 625 226 139 395 259 220
5 168 130 357 629 722 696 652 237 149 431 256 216
6 159 134 387 592 763 829 782 218 150 463 254 214
7 157 135 404 733 797 721 785 224 137 481 250 208
8 159 129 410 972 772 664 695 213 134 471 244 206
9 151 128 449 782 732 634 604 189 149 442 239 201
10 141 194 463 707 719 616 557 202 159 462 231 198
11 141 192 444 719 724 600 588 273 188 465 225 206
12 136 185 550 726 746 611 555 236 260 435 219 214
13 131 187 719 726 760 1,000 554 200 462 381 224 213
14 130 176 1,320 711 719 936 569 179 650 353 232 214
15 127 165 1,380 677 664 1,000 605 183 421 346 235 217
16 124 156 1,220 662 625 1,570 605 190 401 350 231 215
17 126 160 1,220 706 626 1,800 529 237 376 349 230 206
18 124 167 1,150 740 646 1,410 426 269 301 337 245 194
19 128 170 1,110 712 602 1,170 381 289 260 326 266 182
20 144 191 1,090 688 576 945 393 295 395 318 264 192
21 161 206 1,090 720 648 1,800 393 297 450 313 249 188
22 165 211 1,050 731 669 2,560 384 282 438 325 242 182
23 161 227 931 752 641 2,020 355 256 520 344 236 181
24 148 241 870 732 659 1,590 354 225 680 346 248 173
25 138 231 796 686 700 1,270 415 192 940 333 244 176
26 135 201 684 658 672 1,140 350 171 688 324 228 187
27 138 197 621 658 772 998 315 156 544 314 217 195
28 137 198 663 699 904 938 315 150 429 308 231 190
29 144 525 795 718 862 817 304 150 361 306 241 178
30 147   800 739 858 721 277 149 324 302 238 190
31 151   794   850   251 144   293   208