Harborside Marina
Harborside Marina is a marina in Wilmington, IL. The marina offers dockage and has a service department.
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Around Harborside Marina
Data Source: Recreation.gov · Public land: USGS PAD-US
Typical flow by month
1935 to 2026
The water at Harborside Marina typically runs highest in April, at a median 6,905 cfs, and lowest in September, at 1,075 cfs. The highest flow on record for any single day is 55,100 cfs, in 1991.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 3,620 | 1,900 to 6,550 |
| February | 4,160 | 2,030 to 7,120 |
| March | 6,510 | 4,130 to 9,520 |
| April | 6,905 | 4,370 to 10,650 |
| May | 5,550 | 3,600 to 8,930 |
| June | 4,150 | 2,835 to 7,525 |
| July | 2,330 | 1,500 to 4,140 |
| August | 1,460 | 1,030 to 2,190 |
| September | 1,075 | 780 to 1,760 |
| October | 1,300 | 908 to 2,360 |
| November | 2,215 | 1,235 to 4,125 |
| December | 2,950 | 1,550 to 5,590 |
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 92 years of record. Statistics published by the US Geological Survey for Kankakee River near Wilmington, IL (site 05527500). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Current conditions
Today · Fri
80Go/ 100
CloudyWaves 0.8 ft48°FRain 0%Wind 10 kt, gusts 23
Waves
0.5 ft @ 2s
Wind
4 kt
Gusts 23 kt
Air
41°F
Streamflow
1,590 cfs
Normal (39th)
Water level
1.34 ft
Water
55°F
Air quality
17 Good
BRAIDWD monitor, 19 km
National Weather ServiceBelow flood stage
Flood stage 6.5 ft. NWS reads 1.34 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. Air quality: Illinois EPA via EPA AirNow. Preliminary data, not verified. See full conditions →
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