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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 06809500 East Nishnabotna River at Red Oak, IA


Montgomery County, Iowa
Hydrologic Unit Code 10240003
Latitude  41°00'32.5", Longitude  95°14'28.9" NAD83
Drainage area 894  square miles
Gage datum 1,005.40 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 1918-10-01 -> 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
1 206 235 627 662 867 894 870 394 363 370 295 227
2 213 259 633 559 789 1,040 764 421 367 401 306 230
3 205 234 662 493 753 864 946 433 288 330 275 222
4 193 283 659 506 716 855 853 406 318 296 257 214
5 200 301 685 537 730 1,040 785 359 389 334 252 212
6 225 321 619 515 856 896 748 384 468 322 247 212
7 198 235 504 485 1,030 882 647 424 486 319 238 204
8 186 258 488 477 861 1,020 654 404 434 329 234 197
9 179 269 529 529 826 1,080 820 361 470 358 254 191
10 179 278 593 547 967 971 758 308 450 335 248 187
11 182 274 685 580 875 1,050 719 345 404 408 251 186
12 177 250 770 575 880 1,390 694 466 470 365 256 182
13 174 267 976 584 855 1,310 664 361 641 315 240 220
14 173 291 1,000 558 830 1,440 581 361 539 317 233 315
15 174 319 794 638 750 1,830 519 315 387 517 232 310
16 205 323 616 609 733 1,540 485 307 463 412 241 260
17 225 356 777 544 873 1,090 507 328 374 301 264 239
18 242 446 825 570 758 948 524 302 328 324 262 218
19 204 682 905 597 710 919 505 305 325 294 251 209
20 201 617 806 559 727 924 605 328 331 260 251 201
21 207 515 639 605 885 978 524 336 344 254 254 200
22 212 450 573 602 1,000 1,000 622 407 337 253 236 199
23 199 451 592 602 948 1,070 560 426 337 276 228 209
24 201 430 583 632 917 961 472 406 320 290 224 223
25 189 403 557 683 1,010 900 589 384 371 268 220 208
26 183 431 560 671 998 821 458 410 365 249 216 208
27 180 517 615 752 972 1,010 425 319 325 242 219 252
28 181 605 636 742 994 941 407 342 320 236 219 295
29 176 501 704 641 1,050 813 399 495 313 243 214 262
30 203   635 809 970 764 441 546 339 275 219 284
31 197   644   853   424 467   285   224