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: February 2018

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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

10,411

4,014

3,426

1,688

7,159

5437500

 Rock River near Joslin

9,549

74

14,502

6,715

5,854

2,598

12,000

5446500

 Pecatonica River at Freeport

1,326

98

2,940

1,126

915

426

2,052

5435500

 Green River near Geneseo

1,003

78

1,480

774

723

131

1,545

5447500

 Edwards River near New Boston

445

79

506

372

318

45

791

5466500

 Kankakee River at Momence

2,294

99

4,717

2,576

2,492

1,073

4,271

5520500

 Iroquois River near Chebanse

2,091

93

8,139

2,545

2,080

372

6,178

5526000

 Fox River at Dayton

2,642

97

N/A

2,113

1,824

557

3,918

5552500

 Vermilion River at Pontiac

579

73

1,551

522

389

40

1,315

5554500

 Spoon River at Seville

1,636

100

1,689

1,455

1,336

241

2,839

5570000

 LaMoine River at Ripley

1,293

93

836

1,029

745

121

2,196

5585000

 Bear Creek near Marcelline

349

72

338

263

166

14

598

5495500

 Mackinaw River near Congerville

767

68

700

665

540

62

1,616

5567500

 Salt Creek near Greenview

1,804

75

1,079

1,713

1,352

259

3,813

5582000

 Sangamon River at Monticello

550

104

1,133

589

443

52

1,345

5572000

 So. Fork Sangamon near Rochester

867

67

319

874

602

32

2,068

5576000

 Illinois River at Valley City

26,743

78

20,436

25,069

23,518

8,698

48,240

5586100

 Macoupin Creek near Kane

868

88

N/A

755

490

39

1,752

5587000

 Vermilion River near Danville

1,290

95

5,177

1,472

1,063

213

3,208

3339000

 Kaskaskia River at Vandalia

1,940

47

1,995

2,779

2,398

414

5,650

5592500

 Shoal Creek near Breese

735

73

1,003

900

583

76

2,158

5594000

 Embarras River at Ste. Marie

1,516

103

2,430

1,946

1,591

218

4,117

3345500

 Skillet Fork at Wayne City

464

97

1,630

650

498

51

1,487

3380500

 Little Wabash below Clay City

1,131

102

2,050

1,530

1,183

158

3,323

3379500

 Big Muddy at Plumfield

794

46

1,322

1,009

1,030

195

1,767

5597000

 Cache River at Forman

244

93

1,562

487

430

78

943

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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