How high is the Illinois River at Marseilles, IL right now?

The Illinois River at Marseilles, IL is currently flowing at 7,110 cubic feet per second with a gage height of 12.14 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Illinois River at Marseilles, IL normal for this time of year?

Current flow is classified as low for June 11. Today's discharge is at the 20th percentile compared to the long-term historical record at this gauge.

What is the historical median flow for the Illinois River at Marseilles, IL on June 11?

The long-term median discharge for this date is 10,500 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 6,470 to 24,400 cfs.

Where is the Illinois River at Marseilles, IL stream gauge located?

The Illinois River at Marseilles, IL stream gauge is operated by the USGS in LaSalle County, IL on the Illinois River. USGS site number 05543500 (coordinates 41.3270, -88.7171).

Illinois River at Marseilles, IL

USGS Site No: 05543500 • Illinois River • LaSalle County, IL

Illinois River at Marseilles, IL on the Illinois River is currently at 7,110 cfs (Low — 20th percentile for this date) . Gage height: 12.14 ft. This station is at or above flood stage.

Reading from 1 week ago

↑ Upstream on Illinois River

Illinois River at Morris, IL

Downstream on Illinois River ↓

Illinois River at Henry, IL

7,110

CFS Discharge

12.14

Gage Height (ft)

Low

Flow Condition

FLOOD

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	6,470
25th	Low threshold	7,430	Today: 7,110 cfs
50th (Median)	Normal (median)	10,500
75th	High threshold	14,600
95th	Very High threshold	24,400

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	5,440	11.71
May 27, 2026	6,560	11.99
May 26, 2026	7,030	12.08
May 25, 2026	7,180	12.13
May 24, 2026	6,870	12.08
May 23, 2026	5,000	11.60
May 22, 2026	5,560	11.74
May 21, 2026	5,170	11.63
May 20, 2026	6,500	11.98
May 19, 2026	6,120	11.88
May 18, 2026	6,600	12.01
May 17, 2026	5,430	11.72
May 16, 2026	6,290	11.92
May 15, 2026	5,860	11.82
Apr 20, 2026	24,400	15.63
Apr 19, 2026	26,500	15.99
Apr 18, 2026	27,900	16.24
Apr 17, 2026	23,300	15.43
Apr 16, 2026	19,100	14.66
Apr 15, 2026	17,900	14.43
Apr 14, 2026	15,500	13.96
Apr 13, 2026	15,000	13.84
Apr 12, 2026	15,800	14.02
Apr 11, 2026	16,200	14.09
Apr 10, 2026	17,800	14.40
Apr 9, 2026	19,900	14.80
Apr 8, 2026	22,200	15.23
Apr 7, 2026	26,700	16.03
Apr 6, 2026	33,400	17.17
Apr 5, 2026	42,900	18.81

Station Information

USGS Site No: 05543500
State: IL
County: LaSalle County
Coordinates: 41.3270, -88.7171
Drainage Area: 8,259 mi²
Datum (ft): 452.8
HUC Code: 07120005

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 17.0 ft

Recent Extremes

Max discharge: 42,900 cfs

Apr 5, 2026
Min discharge: 2,960 cfs

Oct 17, 2025

Computed from the local daily-values archive.

Nearby Gauges

Fox River at Dayton, IL
5.4 mi · 1,440 cfs

Normal
Illinois River at Morris, IL
15.1 mi · 5,290 cfs

Low
Mazon River Near Coal City, IL
18.8 mi · 148 cfs

Normal
Aux Sable Creek Near Morris, IL
20.1 mi · 35 cfs

Low
Fox River at Yorkville, IL
26.0 mi · 953 cfs

Low