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: December 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

3,841

3,509

3,196

1,341

5,673

5437500

 Rock River near Joslin

9,549

74

5,602

5,432

4,925

1,984

9,551

5446500

 Pecatonica River at Freeport

1,326

98

845

722

612

303

1,293

5435500

 Green River near Geneseo

1,003

78

422

520

403

85

1,174

5447500

 Edwards River near New Boston

445

79

69

202

119

16

432

5466500

 Kankakee River at Momence

2,294

99

2,000

2,069

1,764

826

3,787

5520500

 Iroquois River near Chebanse

2,091

93

753

1,650

1,090

132

4,045

5526000

 Fox River at Dayton

2,642

97

1,446

1,611

1,284

491

3,312

5552500

 Vermilion River at Pontiac

579

73

60

400

170

7

1,070

5554500

 Spoon River at Seville

1,636

100

174

739

401

66

1,511

5570000

 LaMoine River at Ripley

1,293

93

59

550

240

29

1,426

5585000

 Bear Creek near Marcelline

349

72

4

164

36

1

487

5495500

 Mackinaw River near Congerville

767

68

24

477

226

15

1,493

5567500

 Salt Creek near Greenview

1,804

75

180

1,132

533

105

2,837

5582000

 Sangamon River at Monticello

550

104

18

380

184

12

1,118

5572000

 So. Fork Sangamon near Rochester

867

67

26

593

139

8

1,694

5576000

 Illinois River at Valley City

26,743

78

9,831

18,590

15,396

6,722

37,150

5586100

 Macoupin Creek near Kane

868

88

9

531

155

8

1,514

5587000

 Vermilion River near Danville

1,290

95

242

993

564

61

2,625

3339000

 Kaskaskia River at Vandalia

1,940

47

150

2,076

1,677

199

5,294

5592500

 Shoal Creek near Breese

735

73

52

628

195

18

1,762

5594000

 Embarras River at Ste. Marie

1,516

103

63

1,337

833

38

3,501

3345500

 Skillet Fork at Wayne City

464

97

8

468

255

5

1,252

3380500

 Little Wabash below Clay City

1,131

102

21

1,112

533

22

2,706

3379500

 Big Muddy at Plumfield

794

46

88

713

337

43

1,877

5597000

 Cache River at Forman

244

93

136

363

215

13

931

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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