Provisional Monthly Streamflow Network - Data Details, Illinois State Water Survey

Water and Atmospheric Resources Monitoring Program (WARM)

Weather Soil Groundwater Sediment Streamflow Reservoirs

Provisional Monthly Streamflow Network - Tabular Data: May 2017

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Long-term monthly flows for period of record (cfs)

Station Drainage area
(sq. mi.)
Years of record Monthly mean flow (cfs) Mean flow* Median (50% exceedence) flow 90% exceedence flow 10% exceedence flow USGS
Station No.
 Rock River at Rockton

6,363

81

11,000

5,790

5,046

2,745

9,091

5437500

 Rock River near Joslin

9,549

73

20,220

9,085

8,238

3,875

16,030

5446500

 Pecatonica River at Freeport

1,326

97

1,988

1,072

881

453

1,738

5435500

 Green River near Geneseo

1,003

77

2,300

1,035

879

301

2,045

5447500

 Edwards River near New Boston

445

78

850

546

368

120

1,194

5466500

 Kankakee River at Momence

2,294

98

4,032

2,923

2,794

1,449

4,744

5520500

 Iroquois River near Chebanse

2,091

92

6,019

2,756

2,229

669

5,203

5526000

 Fox River at Dayton

2,642

96

6,344

2,585

2,190

801

4,762

5552500

 Vermilion River at Pontiac

579

72

1,250

756

586

180

1,645

5554500

 Spoon River at Seville

1,636

99

4,185

1,868

1,276

397

4,333

5570000

 LaMoine River at Ripley

1,293

92

4,466

1,487

820

208

3,693

5585000

 Bear Creek near Marcelline

349

71

N/A

417

195

25

1,163

5495500

 Mackinaw River near Congerville

767

67

1,364

937

739

244

1,747

5567500

 Salt Creek near Greenview

1,804

74

3,691

2,410

1,821

624

5,164

5582000

 Sangamon River at Monticello

550

103

1,352

722

492

181

1,591

5572000

 So. Fork Sangamon near Rochester

867

66

5,663

1,074

669

153

2,420

5576000

 Illinois River at Valley City

26,743

77

72,050

37,250

34,760

15,327

65,790

5586100

 Macoupin Creek near Kane

868

87

4,244

969

449

82

2,801

5587000

 Vermilion River near Danville

1,290

94

4,965

1,696

1,271

493

3,864

3339000

 Kaskaskia River at Vandalia

1,940

46

5,618

1,994

1,512

199

4,913

5592500

 Shoal Creek near Breese

735

72

4,952

882

561

104

1,789

5594000

 Embarras River at Ste. Marie

1,516

102

9,440

1,969

1,228

340

4,487

3345500

 Skillet Fork at Wayne City

464

96

2,324

660

332

32

2,021

3380500

 Little Wabash below Clay City

1,131

101

8,597

1,479

786

91

4,133

3379500

 Big Muddy at Plumfield

794

45

6,184

1,456

907

215

3,961

5597000

 Cache River at Forman

244

92

1,988

436

313

27

1,031

3612000



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Station Numbers are linked to the U.S. Geological Survey, providing more information about each station.

Notes:
Much below normal flow = 90-100% chance of exceedence.
Below normal flow = 70-90% chance of exceedence.
Normal flow = 30-70% chance of exceedence.
Above normal flow = 10-30% chance of exceedence.
Much above normal flow = 0-10% chance of exceedence.
* As reported in U.S. Geological Survey (USGS) Water Resources Data, Illinois, Water Year 2015.

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Streamflow Data



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