About this river
Fox River is a 12.1 mile river near Harborside Marina in Illinois. Streamflow is measured at the USGS gauge Fox River at Montgomery, IL (site 05551540). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2003 to 2026
Fox River typically runs highest in April, at a median 2,560 cfs, and lowest in September, at 663 cfs. The highest flow on record for any single day is 15,500 cfs, in 2008.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 1,150 | 741 to 1,730 | |
| February | 1,230 | 674 to 2,130 | |
| March | 2,440 | 1,600 to 3,320 | |
| April | 2,560 | 1,510 to 3,600 | |
| May | 2,160 | 1,250 to 3,440 | |
| June | 1,515 | 838 to 2,335 | |
| July | 947 | 608 to 1,890 | |
| August | 732 | 466 to 1,160 | |
| September | 663 | 401 to 1,160 | |
| October | 717 | 474 to 1,270 | |
| November | 1,155 | 890 to 1,545 | |
| December | 1,130 | 735 to 1,780 |
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 24 years of record. Statistics published by the US Geological Survey for Fox River at Montgomery, IL (site 05551540). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
3 mapped launches sit in the mapped area of Fox River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Fox River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
See every free widget you can put on your site, including live conditions and a 7 day forecast.
