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

82

7,730

5,083

4,352

1,734

9,631

5437500

 Rock River near Joslin

9,549

74

12,610

8,342

6,922

2,881

16,493

5446500

 Pecatonica River at Freeport

1,326

98

1,501

1,121

927

357

1,990

5435500

 Green River near Geneseo

1,003

78

992

992

813

225

2,257

5447500

 Edwards River near New Boston

445

79

377

486

370

60

1,138

5466500

 Kankakee River at Momence

2,294

99

2,026

2,334

2,075

1,002

3,927

5520500

 Iroquois River near Chebanse

2,091

93

4,016

2,308

1,703

417

5,013

5526000

 Fox River at Dayton

2,642

97

2,343

2,160

1,719

588

4,676

5552500

 Vermilion River at Pontiac

579

73

1,119

597

406

96

1,270

5554500

 Spoon River at Seville

1,636

100

1,251

1,768

1,138

284

3,852

5570000

 LaMoine River at Ripley

1,293

93

425

1,326

789

101

2,878

5585000

 Bear Creek near Marcelline

349

72

30

369

135

7

1,130

5495500

 Mackinaw River near Congerville

767

68

874

821

568

100

2,073

5567500

 Salt Creek near Greenview

1,804

75

846

2,049

1,650

486

3,964

5582000

 Sangamon River at Monticello

550

104

224

557

388

83

1,230

5572000

 So. Fork Sangamon near Rochester

867

67

280

961

566

107

2,470

5576000

 Illinois River at Valley City

26,743

78

35,880

32,090

28,310

10,482

65,053

5586100

 Macoupin Creek near Kane

868

88

349

652

323

51

1,504

5587000

 Vermilion River near Danville

1,290

95

799

1,363

1,057

229

2,955

3339000

 Kaskaskia River at Vandalia

1,940

47

1,933

1,868

1,684

113

3,826

5592500

 Shoal Creek near Breese

735

73

284

621

366

59

1,469

5594000

 Embarras River at Ste. Marie

1,516

103

921

1,446

986

212

3,178

3345500

 Skillet Fork at Wayne City

464

97

31

358

148

11

1,073

3380500

 Little Wabash below Clay City

1,131

102

157

965

495

55

2,307

3379500

 Big Muddy at Plumfield

794

46

662

832

639

167

1,809

5597000

 Cache River at Forman

244

93

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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