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Around Alton Marina
Data Source: Recreation.gov · Public land: USGS PAD-US
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.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| 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 | 5.8 | 1.7 to 16 |
| July | 2.5 | 0.6 to 8.7 |
| 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
Today · Sun
88Go/ 100
ClearHigh 65°F, low 34°FRain 0%Wind 8 kt, gusts 18
Streamflow
0.9 cfs
Normal (39th)
Water level
0.39 ft
Air quality
63 Moderate
Alton monitor, 3 km
Forecast from Open-Meteo global models (NOAA & ECMWF). Air quality: Illinois EPA via EPA AirNow. Preliminary data, not verified. See full conditions →
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