How high is the Fox River at Algonquin, IL right now?

The Fox River at Algonquin, IL is currently flowing at 725 cubic feet per second with a gage height of 1.58 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Fox River at Algonquin, IL normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 56th percentile compared to the long-term historical record at this gauge.

Is the Fox River at Algonquin, IL at flood stage?

No — the gage height is 1.42 feet below the NWS flood-stage threshold of 3.0 feet.

What is the historical median flow for the Fox River at Algonquin, IL on June 11?

The long-term median discharge for this date is 567 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 227 to 3,300 cfs.

Where is the Fox River at Algonquin, IL stream gauge located?

The Fox River at Algonquin, IL stream gauge is operated by the USGS in McHenry County, IL on the Fox River. USGS site number 05550000 (coordinates 42.1663, -88.2903).

Fox River at Algonquin, IL

USGS Site No: 05550000 • Fox River • McHenry County, IL

Fox River at Algonquin, IL on the Fox River is currently at 725 cfs (Normal — 56th percentile for this date) . Gage height: 1.58 ft.

Reading from 1 week ago

↑ Upstream on Fox River

Fox River at Johnsburg, IL

Downstream on Fox River ↓

Fox River at South Elgin, IL

725

CFS Discharge

1.58

Gage Height (ft)

Normal

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile	Label	CFS Threshold	Today's Flow
10th	Very Low threshold	227
25th	Low threshold	341
50th (Median)	Normal (median)	567
75th	High threshold	1,280	Today: 725 cfs
95th	Very High threshold	3,300

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	—	1.68
May 27, 2026	—	1.70
May 26, 2026	—	1.78
May 25, 2026	—	1.82
May 24, 2026	—	1.75
May 23, 2026	—	1.72
May 22, 2026	—	1.78
May 21, 2026	—	1.87
May 20, 2026	—	1.89
May 19, 2026	—	1.75
May 18, 2026	—	1.71
May 17, 2026	—	1.74
May 16, 2026	—	1.72
May 15, 2026	—	1.73
Apr 20, 2026	—	3.21
Apr 19, 2026	—	2.99
Apr 18, 2026	—	2.77
Apr 17, 2026	—	2.41
Apr 16, 2026	—	2.28
Apr 15, 2026	—	2.07
Apr 14, 2026	—	1.86
Apr 13, 2026	—	1.87
Apr 12, 2026	—	1.93
Apr 11, 2026	—	2.05
Apr 10, 2026	—	2.09
Apr 9, 2026	—	2.00
Apr 8, 2026	—	1.93
Apr 7, 2026	—	1.89
Apr 6, 2026	—	1.76
Apr 5, 2026	—	1.63

Station Information

USGS Site No: 05550000
State: IL
County: McHenry County
Coordinates: 42.1663, -88.2903
Drainage Area: 1,403 mi²
Datum (ft): 729.2
HUC Code: 07120006

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 2.8 ft
Flood Stage: 3.0 ft
Moderate Flood: 3.3 ft
Major Flood: 4.0 ft

Currently 1.42 ft below flood stage.

Nearby Gauges

Salt Creek at Rolling Meadows, IL
15.8 mi · 8 cfs

Normal
Buffalo Creek Near Wheeling, IL
17.1 mi · 8 cfs

Normal
Kishwaukee River at Marengo, IL
17.7 mi · 64 cfs

Normal
Salt Creek at Elk Grove Village, IL
18.3 mi · 43 cfs

Normal
Des Plaines River at Lincolnshire, IL
19.2 mi · 121 cfs

Low