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: June 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

7,730

5,083

4,352

1,734

9,631

5437500

 Rock River near Joslin

9,549

73

12,610

8,342

6,922

2,881

16,493

5446500

 Pecatonica River at Freeport

1,326

97

1,501

1,121

927

357

1,990

5435500

 Green River near Geneseo

1,003

77

992

992

813

225

2,257

5447500

 Edwards River near New Boston

445

78

377

486

370

60

1,138

5466500

 Kankakee River at Momence

2,294

98

2,026

2,334

2,075

1,002

3,927

5520500

 Iroquois River near Chebanse

2,091

92

4,016

2,308

1,703

417

5,013

5526000

 Fox River at Dayton

2,642

96

2,343

2,160

1,719

588

4,676

5552500

 Vermilion River at Pontiac

579

72

1,119

597

406

96

1,270

5554500

 Spoon River at Seville

1,636

99

1,251

1,768

1,138

284

3,852

5570000

 LaMoine River at Ripley

1,293

92

425

1,326

789

101

2,878

5585000

 Bear Creek near Marcelline

349

71

30

369

135

7

1,130

5495500

 Mackinaw River near Congerville

767

67

874

821

568

100

2,073

5567500

 Salt Creek near Greenview

1,804

74

846

2,049

1,650

486

3,964

5582000

 Sangamon River at Monticello

550

103

224

557

388

83

1,230

5572000

 So. Fork Sangamon near Rochester

867

66

280

961

566

107

2,470

5576000

 Illinois River at Valley City

26,743

77

35,880

32,090

28,310

10,482

65,053

5586100

 Macoupin Creek near Kane

868

87

349

652

323

51

1,504

5587000

 Vermilion River near Danville

1,290

94

799

1,363

1,057

229

2,955

3339000

 Kaskaskia River at Vandalia

1,940

46

1,933

1,868

1,684

113

3,826

5592500

 Shoal Creek near Breese

735

72

284

621

366

59

1,469

5594000

 Embarras River at Ste. Marie

1,516

102

921

1,446

986

212

3,178

3345500

 Skillet Fork at Wayne City

464

96

31

358

148

11

1,073

3380500

 Little Wabash below Clay City

1,131

101

157

965

495

55

2,307

3379500

 Big Muddy at Plumfield

794

45

662

832

639

167

1,809

5597000

 Cache River at Forman

244

92

98

214

121

9

441

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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