Around here
Around Mackinaw River
Data Source: Recreation.gov · Public land: USGS PAD-US
About this river
Mackinaw River is a 41.1 mile river. Streamflow is measured at the USGS gauge Mackinaw River near Green Valley, IL (site 05568000). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1921 to 2026
Mackinaw River typically runs highest in April, at a median 855 cfs, and lowest in October, at 65 cfs. The highest flow on record for any single day is 23,500 cfs, in 1944.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 339 | 86 to 912 |
| February | 500 | 141 to 1,080 |
| March | 777 | 407 to 1,430 |
| April | 855 | 453 to 1,635 |
| May | 830 | 383 to 1,570 |
| June | 573 | 276 to 1,200 |
| July | 271 | 119 to 575 |
| August | 116 | 65 to 235 |
| September | 74 | 50 to 135 |
| October | 65 | 44 to 190 |
| November | 125 | 56 to 409 |
| December | 167 | 57 to 629 |
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 74 years of record. Statistics published by the US Geological Survey for Mackinaw River near Green Valley, IL (site 05568000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
One mapped launch sits in the mapped area of Mackinaw River. Ramp data comes from the USGS national boat-ramp inventory.
- Powerton LakePowerton LakePublic
Made to print
Put Mackinaw River on your wall
This river section as an art print, drawn over the real terrain with its miles, plus the trails, roads and peaks around it. Pick the colors and the size, and see the finished print before you buy. From $39, shipping included.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Mackinaw 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.
