Alton Marina
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Boat launches near Alton Marina
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Typical flow by month
1941 to 2026
The water at Alton Marina typically runs highest in April, at a median 16 cfs, and lowest in September, at 0.4 cfs. The highest flow on record for any single day is 4,270 cfs, in 1946.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 7.2 | 1.5 to 20 | |
| February | 12 | 3.7 to 27 | |
| March | 16 | 7.6 to 31 | |
| April | 16 | 7.5 to 32 | |
| May | 11 | 4.4 to 28 | |
| June | 5.7 | 1.7 to 16 | |
| July | 2.4 | 0.6 to 8.4 | |
| August | 0.8 | 0.2 to 2.9 | |
| September | 0.4 | 0.1 to 1.8 | |
| October | 0.4 | 0.1 to 2.1 | |
| November | 2.3 | 0.4 to 7.6 | |
| December | 4.5 | 0.8 to 14 |
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 86 years of record. Statistics published by the US Geological Survey for Indian Creek at Wanda, IL (site 05588000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Current conditions
Streamflow
1.4 cfs
Normal (68th)
Water level
0.41 ft
High today
69°F
Wind
8 kt
Gusts 16 kt
Rain chance
1%
Week ahead
Forecast from Open-Meteo global models (NOAA & ECMWF). See full conditions →
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