How high is the Rock River Near Joslin, IL right now?

The Rock River Near Joslin, IL is currently flowing at 6,680 cubic feet per second with a gage height of 6.44 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Rock River Near Joslin, IL normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 50th percentile compared to the long-term historical record at this gauge.

Is the Rock River Near Joslin, IL at flood stage?

No — the gage height is 5.56 feet below the NWS flood-stage threshold of 12.0 feet.

What is the historical median flow for the Rock River Near Joslin, IL on June 11?

The long-term median discharge for this date is 6,620 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 2,970 to 23,500 cfs.

Where is the Rock River Near Joslin, IL stream gauge located?

The Rock River Near Joslin, IL stream gauge is operated by the USGS in Rock Island County, IL on the Rock River. USGS site number 05446500 (coordinates 41.5561, -90.1853).

Rock River Near Joslin, IL

USGS Site No: 05446500 • Rock River • Rock Island County, IL

Rock River Near Joslin, IL on the Rock River is currently at 6,680 cfs (Normal — 50th percentile for this date) . Gage height: 6.44 ft.

Reading from 1 week ago

↑ Upstream on Rock River

Rock River at Como, IL

6,680

CFS Discharge

6.44

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	2,970
25th	Low threshold	4,100
50th (Median)	Normal (median)	6,620
75th	High threshold	10,000	Today: 6,680 cfs
95th	Very High threshold	23,500

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	6,910	6.57
May 27, 2026	7,760	7.05
May 26, 2026	7,930	7.15
May 25, 2026	8,230	7.32
May 24, 2026	8,360	7.39
May 23, 2026	8,530	7.49
May 22, 2026	8,570	7.51
May 21, 2026	9,030	7.77
May 20, 2026	9,240	7.88
May 19, 2026	9,460	8.00
May 18, 2026	9,780	8.18
May 17, 2026	10,100	8.35
May 16, 2026	10,100	8.33
May 15, 2026	10,200	8.41
Apr 20, 2026	29,400	15.48
Apr 19, 2026	26,800	14.71
Apr 18, 2026	24,200	13.91
Apr 17, 2026	20,000	12.55
Apr 16, 2026	14,900	10.68
Apr 15, 2026	12,900	9.78
Apr 14, 2026	13,000	9.82
Apr 13, 2026	13,300	9.96
Apr 12, 2026	13,400	10.03
Apr 11, 2026	13,400	10.01
Apr 10, 2026	13,500	10.07
Apr 9, 2026	15,000	10.75
Apr 8, 2026	18,000	11.86
Apr 7, 2026	19,800	12.50
Apr 6, 2026	19,500	12.41
Apr 5, 2026	17,700	11.77

Station Information

USGS Site No: 05446500
State: IL
County: Rock Island County
Coordinates: 41.5561, -90.1853
Drainage Area: 9,549 mi²
Datum (ft): 563.7
HUC Code: 07090005

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 11.0 ft
Flood Stage: 12.0 ft
Moderate Flood: 14.0 ft
Major Flood: 16.5 ft

Currently 5.56 ft below flood stage.

Recent Extremes

Max discharge: 29,400 cfs

Apr 20, 2026
Min discharge: 3,040 cfs

Oct 15, 2025
Days at flood stage: 6

Computed from the local daily-values archive.

Nearby Gauges

Green River Near Geneseo, IL
4.9 mi · 448 cfs

Normal
Crow Creek at Bettendorf, IA
14.0 mi · 5 cfs

Low
Mississippi River at Clinton, IA
15.9 mi · 49,000 cfs

Normal
Beaver Slough at 3rd Street at Clinton, IA
18.7 mi · 0 cfs

Unknown
Mill Creek at Milan, IL
20.7 mi · 18 cfs

Normal