About this river
Sangamon River is a 46.4 mile river near Hills guide service in Illinois. Streamflow is measured at the USGS gauge Sangamon River at Route 48 at Decatur, IL (site 05573540). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1983 to 2026
Sangamon River typically runs highest in May, at a median 730 cfs, and lowest in September, at 3.2 cfs. The highest flow on record for any single day is 19,200 cfs, in 2008.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 304 | 16 to 847 | |
| February | 407 | 125 to 1,120 | |
| March | 648 | 293 to 1,450 | |
| April | 680 | 358 to 1,510 | |
| May | 730 | 317 to 1,700 | |
| June | 589 | 209 to 1,310 | |
| July | 171 | 10 to 463 | |
| August | 4.7 | 2.0 to 46 | |
| September | 3.2 | 1.2 to 19 | |
| October | 4.0 | 1.6 to 66 | |
| November | 17 | 2.8 to 355 | |
| December | 307 | 4.9 to 853 |
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 44 years of record. Statistics published by the US Geological Survey for Sangamon River at Route 48 at Decatur, IL (site 05573540). 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 Sangamon 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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