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: September 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

4,263

3,006

2,721

1,166

5,494

5437500

 Rock River near Joslin

9,549

73

6,077

4,402

3,842

1,766

7,952

5446500

 Pecatonica River at Freeport

1,326

97

1,125

772

667

297

1,432

5435500

 Green River near Geneseo

1,003

77

193

351

160

61

878

5447500

 Edwards River near New Boston

445

78

N/A

135

51

15

358

5466500

 Kankakee River at Momence

2,294

98

869

1,075

782

550

1,892

5520500

 Iroquois River near Chebanse

2,091

92

241

601

126

45

1,754

5526000

 Fox River at Dayton

2,642

96

1,010

1,054

652

258

2,490

5552500

 Vermilion River at Pontiac

579

72

42

129

17

2

353

5554500

 Spoon River at Seville

1,636

99

N/A

590

193

54

1,380

5570000

 LaMoine River at Ripley

1,293

92

46

459

121

24

952

5585000

 Bear Creek near Marcelline

349

71

0

152

19

1

399

5495500

 Mackinaw River near Congerville

767

67

33

228

26

5

646

5567500

 Salt Creek near Greenview

1,804

74

141

466

199

115

932

5582000

 Sangamon River at Monticello

550

103

10

121

28

8

324

5572000

 So. Fork Sangamon near Rochester

867

66

2

182

23

3

446

5576000

 Illinois River at Valley City

26,743

77

6,450

12,030

8,221

6,291

24,900

5586100

 Macoupin Creek near Kane

868

87

16

210

52

7

441

5587000

 Vermilion River near Danville

1,290

94

121

294

110

44

730

3339000

 Kaskaskia River at Vandalia

1,940

46

84

560

311

45

1,811

5592500

 Shoal Creek near Breese

735

72

30

171

40

12

384

5594000

 Embarras River at Ste. Marie

1,516

102

34

353

114

38

906

3345500

 Skillet Fork at Wayne City

464

96

0

75

19

1

197

3380500

 Little Wabash below Clay City

1,131

101

14

220

63

8

656

3379500

 Big Muddy at Plumfield

794

45

60

155

105

45

368

5597000

 Cache River at Forman

244

92

3

58

13

1

183

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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