How high is the Sangamon River at Petersburg, IL right now?

The Sangamon River at Petersburg, IL is currently flowing at 1,310 cubic feet per second with a gage height of 6.28 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Sangamon River at Petersburg, IL normal for this time of year?

Current flow is classified as normal for June 11. Today's discharge is at the 30th percentile compared to the long-term historical record at this gauge.

Is the Sangamon River at Petersburg, IL at flood stage?

No — the gage height is 16.72 feet below the NWS flood-stage threshold of 23.0 feet.

What is the historical median flow for the Sangamon River at Petersburg, IL on June 11?

The long-term median discharge for this date is 2,240 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 464 to unavailable cfs.

Where is the Sangamon River at Petersburg, IL stream gauge located?

The Sangamon River at Petersburg, IL stream gauge is operated by the USGS in Menard County, IL on the Sangamon River. USGS site number 05578000 (coordinates 40.0133, -89.8383).

Sangamon River at Petersburg, IL

USGS Site No: 05578000 • Sangamon River • Menard County, IL

Sangamon River at Petersburg, IL on the Sangamon River is currently at 1,310 cfs (Normal — 30th percentile for this date) . Gage height: 6.28 ft.

Reading from 1 week ago

↑ Upstream on Sangamon River

Sangamon River at Riverton, IL

Downstream on Sangamon River ↓

Sangamon River Near Oakford, IL

1,310

CFS Discharge

6.28

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	464
25th	Low threshold	1,080
50th (Median)	Normal (median)	2,240	Today: 1,310 cfs
75th	High threshold	3,630
95th	Very High threshold	0

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	1,550	6.65
May 27, 2026	1,760	6.95
May 26, 2026	2,090	7.39
May 25, 2026	2,430	7.86
May 24, 2026	2,730	8.29
May 23, 2026	3,020	8.69
May 22, 2026	3,440	9.27
May 21, 2026	3,800	9.72
May 20, 2026	3,460	9.28
May 19, 2026	2,520	7.99
May 18, 2026	2,130	7.44
May 17, 2026	2,030	7.32
May 16, 2026	1,860	7.10
May 15, 2026	1,930	7.19
Apr 20, 2026	4,000	9.98
Apr 19, 2026	3,250	9.00
Apr 18, 2026	2,120	7.44
Apr 17, 2026	1,300	6.27
Apr 16, 2026	1,250	6.19
Apr 15, 2026	1,330	6.32
Apr 14, 2026	1,420	6.45
Apr 13, 2026	1,530	6.62
Apr 12, 2026	1,620	6.75
Apr 11, 2026	1,830	7.05
Apr 10, 2026	2,170	7.50
Apr 9, 2026	2,470	7.92
Apr 8, 2026	2,660	8.20
Apr 7, 2026	3,060	8.75
Apr 6, 2026	3,410	9.22
Apr 5, 2026	3,540	9.39

Station Information

USGS Site No: 05578000
State: IL
County: Menard County
Coordinates: 40.0133, -89.8383
Drainage Area: 3,063 mi²
Datum (ft): 473.7
HUC Code: 07130008

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 18.0 ft
Flood Stage: 23.0 ft
Moderate Flood: 24.0 ft
Major Flood: 33.0 ft

Currently 16.72 ft below flood stage.

Recent Extremes

Max discharge: 4,700 cfs

Jun 7, 2025
Min discharge: 57 cfs

Dec 14, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Salt Creek Near Greenview, IL
9.8 mi · 723 cfs

Low
Sangamon River Near Oakford, IL
10.8 mi · 2,260 cfs

Normal
Spring Creek at Springfield, IL
15.5 mi · 53 cfs

Normal
Sangamon River at Riverton, IL
19.4 mi · 940 cfs

Normal
Sugar Creek Near Springfield, IL
20.8 mi · 98 cfs

Normal