How high is the Kaskaskia River at Cooks Mills, IL right now?

The Kaskaskia River at Cooks Mills, IL is currently flowing at 254 cubic feet per second with a gage height of 3.87 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Kaskaskia River at Cooks Mills, IL normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 43th percentile compared to the long-term historical record at this gauge.

What is the historical median flow for the Kaskaskia River at Cooks Mills, IL on June 11?

The long-term median discharge for this date is 301 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 96 to 2,550 cfs.

Where is the Kaskaskia River at Cooks Mills, IL stream gauge located?

The Kaskaskia River at Cooks Mills, IL stream gauge is operated by the USGS in Coles County, IL on the Kaskaskia River. USGS site number 05591200 (coordinates 39.5835, -88.4138).

Kaskaskia River at Cooks Mills, IL

USGS Site No: 05591200 • Kaskaskia River • Coles County, IL

Kaskaskia River at Cooks Mills, IL on the Kaskaskia River is currently at 254 cfs (Normal — 43th percentile for this date) . Gage height: 3.87 ft.

Reading from 1 week ago

↑ Upstream on Kaskaskia River

Kaskaskia River at Chesterville, IL

Downstream on Kaskaskia River ↓

Kaskaskia River at Shelbyville, IL

254

CFS Discharge

3.87

Gage Height (ft)

Normal

Flow Condition

N/A

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	96
25th	Low threshold	128
50th (Median)	Normal (median)	301	Today: 254 cfs
75th	High threshold	652
95th	Very High threshold	2,550

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	344	4.47
May 27, 2026	246	3.84
May 26, 2026	239	3.79
May 25, 2026	284	4.04
May 24, 2026	327	4.34
May 23, 2026	382	4.72
May 22, 2026	460	5.21
May 21, 2026	531	5.63
May 20, 2026	559	5.79
May 19, 2026	512	5.52
May 18, 2026	357	4.56
May 17, 2026	333	4.39
May 16, 2026	316	4.27
May 15, 2026	326	4.34
Apr 20, 2026	1,250	8.91
Apr 19, 2026	1,010	7.93
Apr 18, 2026	653	6.26
Apr 17, 2026	398	4.83
Apr 16, 2026	314	4.25
Apr 15, 2026	285	4.04
Apr 14, 2026	312	4.24
Apr 13, 2026	333	4.39
Apr 12, 2026	377	4.69
Apr 11, 2026	462	5.23
Apr 10, 2026	587	5.94
Apr 9, 2026	759	6.82
Apr 8, 2026	1,010	7.93
Apr 7, 2026	1,270	8.98
Apr 6, 2026	1,480	9.76
Apr 5, 2026	1,620	10.14

Station Information

USGS Site No: 05591200
State: IL
County: Coles County
Coordinates: 39.5835, -88.4138
Drainage Area: 473 mi²
Datum (ft): 616.9
HUC Code: 07140201

View on USGS NWIS →

Recent Extremes

Max discharge: 1,620 cfs

Apr 5, 2026
Min discharge: 3 cfs

Nov 17, 2025

Computed from the local daily-values archive.

Nearby Gauges

Whitley Creek Near Allenville, IL
8.0 mi · 39 cfs

High
Kaskaskia River at Chesterville, IL
8.4 mi · 0 cfs

Unknown
Kaskaskia River Below Ficklin, IL
14.6 mi · 71 cfs

Normal
Lake Fork at Atwood, IL
15.8 mi · 91 cfs

Normal
West Okaw River Near Lovington, IL
16.7 mi · 49 cfs

Normal