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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 05387500 Upper Iowa River at Decorah, IA


Winneshiek County, Iowa
Hydrologic Unit Code 07060002
Latitude  43°18'17.7", Longitude  91°47'43.4" NAD27
Drainage area 511  square miles
Gage datum 850.07 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 1951-10-01 -> 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
1 210 154 453 1,110 559 599 655 317 480 371 285 201
2 193 149 510 990 631 535 616 393 357 353 277 198
3 186 140 419 867 624 493 594 430 290 381 274 200
4 175 179 486 879 676 493 566 421 275 372 264 198
5 169 154 480 832 623 477 519 335 320 381 259 199
6 166 156 451 803 588 480 599 286 310 341 254 201
7 170 189 461 762 608 470 527 275 388 316 259 194
8 168 225 432 730 605 727 507 269 349 307 260 187
9 156 296 402 686 564 1,060 484 270 352 344 250 181
10 157 221 476 676 535 1,240 457 257 359 405 248 176
11 152 183 574 671 544 807 425 252 303 352 277 171
12 149 170 680 640 533 645 451 239 275 318 301 171
13 146 163 607 601 559 619 454 231 289 298 303 187
14 144 185 757 624 606 557 390 222 282 286 263 185
15 139 197 782 754 584 528 402 215 258 288 251 187
16 170 178 758 727 595 558 456 208 299 275 243 194
17 186 170 720 703 543 648 396 213 321 264 233 185
18 225 166 693 674 506 618 430 213 271 258 225 177
19 193 167 751 653 521 553 353 216 322 252 220 170
20 160 202 763 651 541 615 353 231 441 255 221 167
21 152 270 778 682 638 751 337 274 494 292 226 167
22 188 317 765 658 690 831 362 363 573 298 247 166
23 174 256 848 627 711 996 409 375 466 312 240 162
24 167 253 918 579 595 922 463 587 434 338 224 160
25 176 243 839 601 542 692 451 466 494 312 216 164
26 154 234 904 586 557 709 504 378 408 298 213 167
27 153 294 978 575 545 764 422 342 362 299 208 186
28 142 317 1,040 584 571 732 354 369 356 303 206 260
29 155 282 920 590 590 784 348 458 462 282 208 253
30 143   1,040 542 616 787 321 473 495 276 207 269
31 139   1,110   690   316 500   283   256