West Fork Mazon River in Illinois
Around here
Around West Fork Mazon River
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
About this river
West Fork Mazon River is a 28.5 mile stream. Streamflow is measured at the USGS gauge Mazon River near Coal City, IL (site 05542000). The National Hydrography Dataset places it at stream order 4. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1940 to 2026
West Fork Mazon River typically runs highest in April, at a median 327 cfs, and lowest in September, at 5.3 cfs. The highest flow on record for any single day is 19,400 cfs, in 1983.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 120 | 32 to 290 |
| February | 129 | 43 to 362 |
| March | 327 | 154 to 699 |
| April | 327 | 159 to 763 |
| May | 285 | 131 to 566 |
| June | 192 | 80 to 485 |
| July | 47 | 14 to 189 |
| August | 9.9 | 3.8 to 31 |
| September | 5.3 | 1.4 to 24 |
| October | 7.7 | 1.8 to 107 |
| November | 35 | 4.8 to 198 |
| December | 105 | 6.5 to 307 |
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 84 years of record. Statistics published by the US Geological Survey for Mazon River near Coal City, IL (site 05542000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show West Fork Mazon 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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