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: March 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

80

8,613

7,365

7,851

2,949

12,719

5437500

 Rock River near Joslin

9,549

72

11,700

11,090

9,725

4,324

18,100

5446500

 Pecatonica River at Freeport

1,326

96

1,457

1,765

1,722

649

3,180

5435500

 Green River near Geneseo

1,003

76

686

1,081

902

398

2,037

5447500

 Edwards River near New Boston

445

77

219

528

413

138

1,062

5466500

 Kankakee River at Momence

2,294

97

3,047

3,341

3,201

1,639

5,157

5520500

 Iroquois River near Chebanse

2,091

91

1,482

3,170

2,742

829

6,044

5526000

 Fox River at Dayton

2,642

95

3,422

3,363

2,866

1,231

5,915

5552500

 Vermilion River at Pontiac

579

71

463

758

674

120

1,567

5554500

 Spoon River at Seville

1,636

98

748

1,727

1,287

449

4,009

5570000

 LaMoine River at Ripley

1,293

91

281

1,317

917

281

3,486

5585000

 Bear Creek near Marcelline

349

70

87

375

247

42

1,002

5495500

 Mackinaw River near Congerville

767

66

739

948

739

157

2,391

5567500

 Salt Creek near Greenview

1,804

73

988

2,106

1,729

435

4,212

5582000

 Sangamon River at Monticello

550

102

264

713

606

139

1,339

5572000

 So. Fork Sangamon near Rochester

867

65

133

989

708

98

2,051

5576000

 Illinois River at Valley City

26,743

76

23,190

34,480

30,487

13,052

54,710

5586100

 Macoupin Creek near Kane

868

86

317

876

576

114

1,721

5587000

 Vermilion River near Danville

1,290

93

957

1,726

1,442

501

3,125

3339000

 Kaskaskia River at Vandalia

1,940

45

594

2,958

2,498

546

6,037

5592500

 Shoal Creek near Breese

735

71

152

958

729

182

1,940

5594000

 Embarras River at Ste. Marie

1,516

101

516

2,185

1,981

523

4,495

3345500

 Skillet Fork at Wayne City

464

95

295

821

728

112

1,820

3380500

 Little Wabash below Clay City

1,131

100

508

1,747

1,470

295

3,447

3379500

 Big Muddy at Plumfield

794

44

598

1,355

1,139

367

2,292

5597000

 Cache River at Forman

244

91

331

620

436

207

1,217

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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