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: August 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

8,658

3,144

2,596

1,280

5,047

5437500

 Rock River near Joslin

9,549

73

13,903

4,795

3,957

2,001

8,286

5446500

 Pecatonica River at Freeport

1,326

97

2,179

762

605

332

1,414

5435500

 Green River near Geneseo

1,003

77

501

386

245

98

1,001

5447500

 Edwards River near New Boston

445

78

75

157

79

20

347

5466500

 Kankakee River at Momence

2,294

98

1,473

1,129

930

525

1,822

5520500

 Iroquois River near Chebanse

2,091

92

831

463

248

63

1,281

5526000

 Fox River at Dayton

2,642

96

2,315

1,038

680

294

2,059

5552500

 Vermilion River at Pontiac

579

72

55

117

34

6

304

5554500

 Spoon River at Seville

1,636

99

N/A

505

311

80

1,020

5570000

 LaMoine River at Ripley

1,293

92

165

349

189

35

971

5585000

 Bear Creek near Marcelline

349

71

27

96

45

1

279

5495500

 Mackinaw River near Congerville

767

67

52

161

59

13

266

5567500

 Salt Creek near Greenview

1,804

74

219

626

363

160

1,044

5582000

 Sangamon River at Monticello

550

103

30

141

54

12

346

5572000

 So. Fork Sangamon near Rochester

867

66

16

205

53

7

470

5576000

 Illinois River at Valley City

26,743

77

16,164

13,769

11,670

7,032

22,381

5586100

 Macoupin Creek near Kane

868

87

23

192

68

14

409

5587000

 Vermilion River near Danville

1,290

94

292

395

157

49

1,001

3339000

 Kaskaskia River at Vandalia

1,940

46

401

898

568

87

2,045

5592500

 Shoal Creek near Breese

735

72

57

177

65

17

456

5594000

 Embarras River at Ste. Marie

1,516

102

92

397

168

59

891

3345500

 Skillet Fork at Wayne City

464

96

5

117

23

1

345

3380500

 Little Wabash below Clay City

1,131

101

46

308

99

16

553

3379500

 Big Muddy at Plumfield

794

45

150

263

217

45

602

5597000

 Cache River at Forman

244

92

11

68

24

4

176

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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