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: October 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

5,019

3,172

2,932

1,093

5,603

5437500

 Rock River near Joslin

9,549

74

7,826

4,599

4,180

1,578

8,614

5446500

 Pecatonica River at Freeport

1,326

98

1,201

716

634

313

1,343

5435500

 Green River near Geneseo

1,003

78

941

377

215

67

963

5447500

 Edwards River near New Boston

445

79

155

138

48

13

428

5466500

 Kankakee River at Momence

2,294

99

1,826

1,247

922

596

2,415

5520500

 Iroquois River near Chebanse

2,091

93

1,282

733

193

59

1,923

5526000

 Fox River at Dayton

2,642

97

3,753

1,153

894

320

2,099

5552500

 Vermilion River at Pontiac

579

73

200

152

24

3

556

5554500

 Spoon River at Seville

1,636

100

215

514

179

58

1,143

5570000

 LaMoine River at Ripley

1,293

93

120

430

113

25

1,336

5585000

 Bear Creek near Marcelline

349

72

32

122

13

1

277

5495500

 Mackinaw River near Congerville

767

68

23

203

30

7

562

5567500

 Salt Creek near Greenview

1,804

75

165

546

218

110

1,663

5582000

 Sangamon River at Monticello

550

104

19

173

35

7

591

5572000

 So. Fork Sangamon near Rochester

867

67

10

208

24

2

381

5576000

 Illinois River at Valley City

26,743

78

16,027

12,770

7,888

5,592

29,690

5586100

 Macoupin Creek near Kane

868

88

20

262

41

5

663

5587000

 Vermilion River near Danville

1,290

95

333

364

104

42

983

3339000

 Kaskaskia River at Vandalia

1,940

47

159

581

172

53

1,781

5592500

 Shoal Creek near Breese

735

73

144

181

45

8

716

5594000

 Embarras River at Ste. Marie

1,516

103

144

428

100

30

1,064

3345500

 Skillet Fork at Wayne City

464

97

7

107

12

0

310

3380500

 Little Wabash below Clay City

1,131

102

87

231

51

7

725

3379500

 Big Muddy at Plumfield

794

46

56

143

65

34

386

5597000

 Cache River at Forman

244

93

58

61

16

1

187

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 2016.

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Streamflow Data



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