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

82

4,263

3,006

2,721

1,166

5,494

5437500

 Rock River near Joslin

9,549

74

6,077

4,402

3,842

1,766

7,952

5446500

 Pecatonica River at Freeport

1,326

98

1,125

772

667

297

1,432

5435500

 Green River near Geneseo

1,003

78

193

351

160

61

878

5447500

 Edwards River near New Boston

445

79

N/A

135

51

15

358

5466500

 Kankakee River at Momence

2,294

99

869

1,075

782

550

1,892

5520500

 Iroquois River near Chebanse

2,091

93

241

601

126

45

1,754

5526000

 Fox River at Dayton

2,642

97

1,010

1,054

652

258

2,490

5552500

 Vermilion River at Pontiac

579

73

42

129

17

2

353

5554500

 Spoon River at Seville

1,636

100

N/A

590

193

54

1,380

5570000

 LaMoine River at Ripley

1,293

93

46

459

121

24

952

5585000

 Bear Creek near Marcelline

349

72

0

152

19

1

399

5495500

 Mackinaw River near Congerville

767

68

33

228

26

5

646

5567500

 Salt Creek near Greenview

1,804

75

141

466

199

115

932

5582000

 Sangamon River at Monticello

550

104

10

121

28

8

324

5572000

 So. Fork Sangamon near Rochester

867

67

2

182

23

3

446

5576000

 Illinois River at Valley City

26,743

78

6,450

12,030

8,221

6,291

24,900

5586100

 Macoupin Creek near Kane

868

88

16

210

52

7

441

5587000

 Vermilion River near Danville

1,290

95

121

294

110

44

730

3339000

 Kaskaskia River at Vandalia

1,940

47

84

560

311

45

1,811

5592500

 Shoal Creek near Breese

735

73

30

171

40

12

384

5594000

 Embarras River at Ste. Marie

1,516

103

34

353

114

38

906

3345500

 Skillet Fork at Wayne City

464

97

0

75

19

1

197

3380500

 Little Wabash below Clay City

1,131

102

14

220

63

8

656

3379500

 Big Muddy at Plumfield

794

46

60

155

105

45

368

5597000

 Cache River at Forman

244

93

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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