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USGS Daily Statistics for Iowa

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Boating safety tips are available from the U.S. Coast Guard.

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 05459500 Winnebago River at Mason City, IA


Cerro Gordo County, Iowa
Hydrologic Unit Code 07080203
Latitude  43°09'54", Longitude  93°11'33" NAD83
Drainage area 526  square miles
Gage datum 1,069.51 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 1932-10-01 -> 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
1 125 76 303 912 549 561 573 249 241 232 216 153
2 118 72 285 825 564 545 524 243 214 238 221 152
3 109 73 301 771 567 512 485 246 196 242 212 147
4 100 76 328 759 560 496 446 237 187 248 203 145
5 100 80 375 776 562 486 434 237 196 253 198 141
6 106 82 419 788 547 457 460 230 194 248 198 140
7 97 76 407 763 520 487 417 223 214 247 198 137
8 92 79 364 721 507 645 426 231 228 246 188 137
9 86 94 359 676 521 612 427 227 230 255 183 129
10 85 93 388 658 531 598 415 259 218 254 191 121
11 83 107 469 669 518 547 419 244 202 243 192 118
12 79 99 516 692 526 628 384 221 188 250 192 126
13 78 107 530 697 534 659 389 232 197 242 192 131
14 77 115 571 701 528 585 412 240 209 222 190 136
15 73 124 591 659 498 585 375 221 249 210 186 141
16 75 123 635 629 483 576 346 211 263 203 186 136
17 78 141 608 598 496 616 364 211 242 198 189 129
18 82 163 614 570 513 614 371 226 228 198 190 125
19 79 164 600 584 501 653 414 198 261 198 190 119
20 80 190 661 620 497 642 405 207 313 202 190 118
21 80 208 642 616 540 664 396 216 303 201 198 115
22 90 212 619 601 624 682 352 247 324 209 197 115
23 92 217 624 601 577 694 331 276 297 219 188 112
24 91 202 624 576 592 723 326 276 269 222 181 110
25 89 193 646 562 561 739 313 274 261 215 175 114
26 83 212 710 542 550 741 300 252 262 211 168 116
27 79 239 733 525 561 726 289 244 248 216 168 125
28 79 294 729 561 574 660 277 250 253 209 161 140
29 77 366 760 560 598 653 275 290 260 207 158 137
30 76   876 551 642 624 272 264 242 215 154 137
31 76   920   583   261 307   209   132