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Around Clear Lake Boats
Source: USGS GNIS · Public land: USGS PAD-US
Typical flow by month
1933 to 2026
The water at Clear Lake Boats 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.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| 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 | 101 | 51 to 229 |
| September | 86 | 46 to 201 |
| 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.
Current conditions
Today · Sat
71Go/ 100
CloudyHigh 48°F, low 32°FRain 0%Wind 12 kt, gusts 23
Streamflow
898 cfs
Much above normal (95th)
Water level
6.89 ft
National Weather ServiceBelow flood stage
Flood stage 10 ft. NWS reads 6.7 ft here.
NWS issues forecasts here only during high water.
Forecast from Open-Meteo global models (NOAA & ECMWF). Flood stages and forecasts: NOAA National Weather Service. See full conditions →
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