RIVER GAUGE · FOX RIVER
Fox River at Algonquin
McHenry County, Illinois
Water level1.60 ft
Flow766 cfs
Last readingSep 16, 2026, 4:45 PM UTC (last recorded)
Action2.8 ft
Minor flood3 ft
Moderate flood3.3 ft
Major flood4 ft
The past week
Loading chart…
What floods at each level
- 6 ft
Algonquin Road (IL-62) is threatened west of the river in Algonquin.
- 4 ft
Flooding affects residences in Algonquin along Lowe Drive.
- 3.5 ft
Some homes flood in Valley View subdivision north of St Charles.
- 3.2 ft
Some homes are threatened by flooding in Richardson subdivision near Algonquin.
- 3 ft
Flooding begins to affect residences along River Road in Fox River Grove. Water inundates some streets in mobile home park in Northwest Elgin. Street flooding begins in Holiday Hills.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Mar 31, 1916 | 4.5 ft | — |
| Jul 4, 1938 | 4.42 ft | 5,630 cfs |
| Mar 5, 1918 | 4.4 ft | 5,750 cfs |
When the water runs low
- 1.0
River reaches zero flow except for any water released manually through gates.
More on Fox River
DownstreamFox River at Algonquin tailwater
Get an alert when Fox River rises
Save this gauge in the free StormCast app and pick the level that matters to you. Your phone goes off when the water gets there.
