How high is the Rock River at Rockton, IL right now?

The Rock River at Rockton, IL is currently flowing at 4,690 cubic feet per second with a gage height of 5.02 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Rock River at Rockton, IL normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 59th percentile compared to the long-term historical record at this gauge.

Is the Rock River at Rockton, IL at flood stage?

No — the gage height is 4.98 feet below the NWS flood-stage threshold of 10.0 feet.

What is the historical median flow for the Rock River at Rockton, IL on June 11?

The long-term median discharge for this date is 3,980 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 1,750 to 13,200 cfs.

Where is the Rock River at Rockton, IL stream gauge located?

The Rock River at Rockton, IL stream gauge is operated by the USGS in Winnebago County, IL on the Rock River. USGS site number 05437500 (coordinates 42.4503, -89.0725).

Rock River at Rockton, IL

USGS Site No: 05437500 • Rock River • Winnebago County, IL

Rock River at Rockton, IL on the Rock River is currently at 4,690 cfs (Normal — 59th percentile for this date) . Gage height: 5.02 ft.

Reading from 1 week ago

Downstream on Rock River ↓

Rock River at Byron, IL

4,690

CFS Discharge

5.02

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	1,750
25th	Low threshold	2,440
50th (Median)	Normal (median)	3,980
75th	High threshold	6,030	Today: 4,690 cfs
95th	Very High threshold	13,200

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	4,790	5.08
May 27, 2026	4,560	4.94
May 26, 2026	4,680	5.01
May 25, 2026	5,320	5.37
May 24, 2026	5,460	5.45
May 23, 2026	5,750	5.61
May 22, 2026	6,050	5.77
May 21, 2026	6,190	5.84
May 20, 2026	6,380	5.94
May 19, 2026	6,540	6.02
May 18, 2026	6,720	6.12
May 17, 2026	6,970	6.26
May 16, 2026	7,070	6.32
May 15, 2026	7,270	6.42
Apr 20, 2026	20,800	12.20
Apr 19, 2026	21,600	12.48
Apr 18, 2026	20,500	12.07
Apr 17, 2026	16,100	10.42
Apr 16, 2026	14,600	9.83
Apr 15, 2026	11,000	8.28
Apr 14, 2026	8,540	7.08
Apr 13, 2026	7,970	6.79
Apr 12, 2026	7,920	6.77
Apr 11, 2026	7,920	6.76
Apr 10, 2026	7,600	6.60
Apr 9, 2026	7,250	6.41
Apr 8, 2026	7,580	6.59
Apr 7, 2026	7,790	6.70
Apr 6, 2026	7,680	6.64
Apr 5, 2026	7,480	6.53

Station Information

USGS Site No: 05437500
State: IL
County: Winnebago County
Coordinates: 42.4503, -89.0725
Drainage Area: 6,363 mi²
Datum (ft): 707.8
HUC Code: 07090005

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 8.5 ft
Flood Stage: 10.0 ft
Moderate Flood: 11.0 ft
Major Flood: 14.0 ft

Currently 4.98 ft below flood stage.

Recent Extremes

Max discharge: 21,600 cfs

Apr 19, 2026
Min discharge: 2,490 cfs

Nov 15, 2025
Days at flood stage: 4

Computed from the local daily-values archive.

Nearby Gauges

Pecatonica River near Shirland, Ill
5.3 mi · 1,380 cfs

Normal
Kishwaukee River at Belvidere, IL
17.2 mi · 233 cfs

Normal
Kishwaukee River Near Perryville, IL
18.1 mi · 570 cfs

Normal
Rock River at Byron, IL
24.5 mi · 5,540 cfs

Normal
South Branch Kishwaukee River near Fairdale IL
25.1 mi · 73 cfs

Low