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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 05471050 South Skunk River at Colfax, IA


Jasper County, Iowa
Hydrologic Unit Code 07080105
Latitude  41°40'54.5", Longitude  93°14'48.6" NAD83
Drainage area 803  square miles
Gage datum 770.00 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 1985-10-01 -> 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
1 278 203 481 878 1,090 1,440 1,360 477 653 365 375 309
2 279 202 501 840 1,120 1,360 1,300 404 650 441 346 319
3 260 206 530 756 1,070 1,230 1,130 385 547 470 333 303
4 243 227 555 739 1,090 1,200 1,070 400 471 434 342 286
5 237 221 583 704 1,140 1,250 1,020 375 419 419 336 273
6 233 213 606 675 1,090 1,260 1,080 337 406 396 342 261
7 227 214 592 672 1,090 1,200 1,020 321 459 378 344 254
8 227 225 649 654 1,130 1,230 893 321 441 373 326 249
9 220 244 728 710 1,160 1,190 924 452 392 419 304 242
10 209 292 858 746 1,280 1,200 957 635 367 457 290 237
11 205 325 917 714 1,190 1,230 1,020 794 349 483 279 234
12 198 275 921 763 1,140 1,340 1,180 754 397 514 281 234
13 190 238 1,100 843 1,300 1,410 1,160 850 363 487 284 274
14 196 244 1,220 821 1,230 1,430 966 931 316 484 301 384
15 188 282 1,250 864 1,100 1,570 827 715 279 492 294 418
16 190 319 1,180 870 1,020 1,600 758 594 281 471 297 429
17 213 317 1,040 806 1,050 1,530 729 546 313 427 352 407
18 199 374 959 817 1,100 1,600 744 523 348 400 334 350
19 194 478 930 830 1,050 1,730 758 600 346 424 305 308
20 197 556 898 843 1,130 1,770 838 590 342 408 297 291
21 211 561 853 878 1,280 1,620 714 614 395 373 293 282
22 219 544 798 888 1,320 1,610 631 529 390 374 290 273
23 217 485 767 936 1,290 1,480 571 460 415 397 283 273
24 204 456 790 906 1,340 1,410 564 451 428 430 272 274
25 196 419 822 954 1,530 1,360 617 386 456 391 264 280
26 198 385 800 1,080 1,670 1,390 549 382 513 368 255 282
27 192 407 774 1,220 1,690 1,390 494 452 464 345 285 286
28 187 495 740 1,220 1,600 1,350 555 385 411 325 304 330
29 183 583 703 1,150 1,490 1,250 556 496 384 321 303 322
30 182   722 1,040 1,520 1,240 592 556 363 403 310 297
31 191   817   1,530   553 546   406   274