About this river
Winnebago River is a 16.7 mile river near Lady of the Lake in Iowa. Streamflow is measured at the USGS gauge Winnebago River at Mason City, IA (site 05459500). The National Hydrography Dataset places it at stream order 5. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1933 to 2026
Winnebago River typically runs highest in April, at a median 429 cfs, and lowest in January, at 55 cfs. The highest flow on record for any single day is 10,400 cfs, in 2008.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 55 | 26 to 110 | |
| February | 62 | 30 to 113 | |
| March | 303 | 107 to 711 | |
| April | 429 | 202 to 864 | |
| May | 353 | 157 to 708 | |
| June | 345 | 138 to 775 | |
| July | 207 | 78 to 469 | |
| August | 99 | 51 to 226 | |
| September | 84 | 45 to 203 | |
| October | 87 | 40 to 270 | |
| November | 114 | 44 to 244 | |
| December | 76 | 33 to 161 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 94 years of record. Statistics published by the US Geological Survey for Winnebago River at Mason City, IA (site 05459500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Winnebago River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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