How high is the South Branch Kishwaukee River at Dekalb, IL right now?

The South Branch Kishwaukee River at Dekalb, IL is currently flowing at 21 cubic feet per second with a gage height of 3.15 feet, based on the most recent USGS instantaneous reading.

Is the flow on the South Branch Kishwaukee River at Dekalb, IL normal for this time of year?

Current flow is classified as low for June 11. Today's discharge is at the 23th percentile compared to the long-term historical record at this gauge.

Is the South Branch Kishwaukee River at Dekalb, IL at flood stage?

No — the gage height is 6.85 feet below the NWS flood-stage threshold of 10.0 feet.

What is the historical median flow for the South Branch Kishwaukee River at Dekalb, IL on June 11?

The long-term median discharge for this date is 55 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 10 to 403 cfs.

Where is the South Branch Kishwaukee River at Dekalb, IL stream gauge located?

The South Branch Kishwaukee River at Dekalb, IL stream gauge is operated by the USGS in DeKalb County, IL on the South Branch Kishwaukee River. USGS site number 05439000 (coordinates 41.9311, -88.7597).

South Branch Kishwaukee River at Dekalb, IL

USGS Site No: 05439000 • South Branch Kishwaukee River • DeKalb County, IL

South Branch Kishwaukee River at Dekalb, IL on the South Branch Kishwaukee River is currently at 21 cfs (Low — 23th percentile for this date) . Gage height: 3.15 ft.

Reading from 1 week ago

Downstream on South Branch Kishwaukee River ↓

South Branch Kishwaukee River near Fairdale IL

CFS Discharge

3.15

Gage Height (ft)

Low

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	10
25th	Low threshold	23	Today: 21 cfs
50th (Median)	Normal (median)	55
75th	High threshold	98
95th	Very High threshold	403

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	25	3.19
May 27, 2026	29	3.22
May 26, 2026	32	3.25
May 25, 2026	38	3.30
May 24, 2026	52	3.44
May 23, 2026	26	3.19
May 22, 2026	27	3.21
May 21, 2026	26	3.20
May 20, 2026	29	3.23
May 19, 2026	35	3.28
May 18, 2026	36	3.29
May 17, 2026	36	3.29
May 16, 2026	40	3.32
May 15, 2026	40	3.32
Apr 20, 2026	277	5.05
Apr 19, 2026	424	5.82
Apr 18, 2026	571	6.55
Apr 17, 2026	333	5.35
Apr 16, 2026	360	5.50
Apr 15, 2026	201	4.57
Apr 14, 2026	141	4.14
Apr 13, 2026	128	4.04
Apr 12, 2026	135	4.10
Apr 11, 2026	144	4.17
Apr 10, 2026	160	4.29
Apr 9, 2026	163	4.31
Apr 8, 2026	202	4.58
Apr 7, 2026	257	4.93
Apr 6, 2026	358	5.49
Apr 5, 2026	549	6.44

Station Information

USGS Site No: 05439000
State: IL
County: DeKalb County
Coordinates: 41.9311, -88.7597
Drainage Area: 78 mi²
Datum (ft): 831.8
HUC Code: 07090006

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 8.5 ft
Flood Stage: 10.0 ft
Moderate Flood: 11.0 ft
Major Flood: 12.5 ft

Currently 6.85 ft below flood stage.

Recent Extremes

Max discharge: 698 cfs

Apr 3, 2026
Min discharge: 0 cfs

Oct 5, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

South Branch Kishwaukee River near Fairdale IL
14.4 mi · 73 cfs

Low
Kishwaukee River Near Perryville, IL
21.9 mi · 570 cfs

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

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

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

Normal