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: April 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

10,720

7,688

6,878

3,161

12,840

5437500

 Rock River near Joslin

9,549

73

18,240

11,190

10,252

4,694

18,873

5446500

 Pecatonica River at Freeport

1,326

97

1,843

1,291

1,058

512

2,361

5435500

 Green River near Geneseo

1,003

77

1,829

1,073

960

379

2,347

5447500

 Edwards River near New Boston

445

78

837

557

422

149

1,147

5466500

 Kankakee River at Momence

2,294

98

4,723

3,463

3,508

1,678

5,393

5520500

 Iroquois River near Chebanse

2,091

92

4,313

3,174

2,962

936

5,945

5526000

 Fox River at Dayton

2,642

96

6,270

3,353

2,956

1,173

5,375

5552500

 Vermilion River at Pontiac

579

72

1,181

809

672

190

1,644

5554500

 Spoon River at Seville

1,636

99

3,194

1,911

1,532

395

4,055

5570000

 LaMoine River at Ripley

1,293

92

1,902

1,590

1,279

246

3,284

5585000

 Bear Creek near Marcelline

349

71

547

424

304

36

861

5495500

 Mackinaw River near Congerville

767

67

1,833

1,060

928

233

2,077

5567500

 Salt Creek near Greenview

1,804

74

3,387

2,373

1,955

771

4,521

5582000

 Sangamon River at Monticello

550

103

852

796

674

187

1,648

5572000

 So. Fork Sangamon near Rochester

867

66

1,525

1,070

770

153

2,243

5576000

 Illinois River at Valley City

26,743

77

52,410

37,230

33,940

15,297

61,280

5586100

 Macoupin Creek near Kane

868

87

1,869

1,142

674

125

2,864

5587000

 Vermilion River near Danville

1,290

94

2,537

1,880

1,571

471

3,786

3339000

 Kaskaskia River at Vandalia

1,940

46

1,845

2,562

1,960

293

5,594

5592500

 Shoal Creek near Breese

735

72

954

1,034

696

160

2,236

5594000

 Embarras River at Ste. Marie

1,516

102

2,218

2,275

1,768

516

4,787

3345500

 Skillet Fork at Wayne City

464

96

1,133

820

669

110

1,910

3380500

 Little Wabash below Clay City

1,131

101

1,464

1,718

1,194

195

3,830

3379500

 Big Muddy at Plumfield

794

45

953

1,519

1,313

350

3,113

5597000

 Cache River at Forman

244

92

643

586

518

117

1,184

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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