Station list     Available data
ILLINOIS RIVER BASIN


05586100       ILLINOIS RIVER AT VALLEY CITY, IL

 

LOCATION.-- Lat 39°42'12", long 90°38'43" (NAD of 1927), in SE1/4NW1/4 sec.34, T.15 N., R.14 W., Scott County, Hydrologic Unit 07130011, on upstream side of Norfolk & Southern Corporation Railroad bridge at Flints Creek, 0.4 mi east of Valley City, 1.8 mi downstream from Mauvaise Terre Creek, and at mile 61.3. Auxiliary gage 10.0 miles upstream.

 

DRAINAGE AREA.-- 26,743 mi2, does not include diversion from Lake Michigan through the Chicago Sanitary and Ship Canal, which has occurred since Jan. 17, 1900.

 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

 

DISCHARGE: October 1938 to current year. Prior to October 1960, at site 0.2 mi upstream at same datum. Prior to October 1989, published as "at Meredosia." Records are considered equivalent.

 

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

 

CHEMICAL: Water years 1975-93 and 1996 to current year.

 

SEDIMENT: February 1980 to current year.

 

SPECIFIC CONDUCTANCE: Water years 1975-81.

 

WATER TEMPERATURE: Water years 1975-81.

 

MISCELLANEOUS: Contaminants in streambed sediments, October 1996; contaminants in fish tissue, October 1996; sediment concentration and particle size, water years 1996-2003.

BIOLOGICAL

 

ALGAE: Water years 1980-81, 1997-98, and 2002-03.

 

BENTHIC MACROINVERTEBRATES: Water years 1997-98 and 2002.

 

FISH: Water year 1998 and 2003-04.

 

HABITAT: Water years 1997-98 and 2003.

 

GAGE.-- U.S. Army Corps of Engineer's water-stage recorder and satellite telemeter, crest-stage gage, and water-quality monitor. Datum of gage is 418.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to Nov. 25, 1992 and Oct. 1, 1994 to current; auxiliary gage (05585500) at site 10.0 mi upstream. Nov. 25, 1992 to Sept. 30, 1994; auxiliary gage operated at this site (05586100).

 

REMARKS.-- Occasional regulation at low flow by navigation dam at La Grange. Since Jan. 17, 1900, flow has included diversion from Lake Michigan through Chicago Sanitary and Ship Canal. Suspended-sediment samples were collected by a local observer twice weekly with additional samples collected during high runoff periods. Since February 1994, samples used to compute sediment record have been collected at upstream side Rt. 106 bridge at Florence at mile 56.

 

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 123,000 ft3/s, May 26-28, 1943; maximum gage height, 28.61 ft, May 26, 1943; minimum daily discharge, 1,330 ft3/s, Sept. 2, 1984.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 3,720 mg/L, Apr. 14, 1981; minimum daily, 14 mg/L, Dec. 26, 1984, July 21, 1993.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 410,000 tons, June 4, 1980; minimum daily, 172 tons, Sept. 2, 1984.

 

REMARKS FOR CURRENT YEAR.-- Records fair except those for estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
16140 6650 30900 19400 e7400 17700 34400 17200 43600 38400 9440 24900 
25820 6970 30000 19700 e6500 14900 36500 18100 44500 36800 9090 25200 
35030 7600 28600 19700 e6900 14200 38200 18500 45600 35500 9820 25100 
44390 8680 e26100 21600 e7200 15100 39300 18500 46000 33600 10400 24700 
54770 11600 e18400 23200 e7500 21000 40000 17400 46400 31800 10100 24200 
 
64040 15800 17100 23700 e8000 e23900 40100 16200 46900 29800 10300 e23100 
73150 17500 16300 22300 e8500 26500 39600 16100 47500 26200 11400 e19700 
83520 17300 15400 21500 e9400 29200 38700 16300 47800 e21800 11200 18000 
94630 17300 15100 21600 e10000 31400 37700 15800 47700 19400 10800 16200 
105720 16400 e18500 22400 e8400 33000 36200 14000 47500 19300 10300 12000 
 
114470 15700 e27000 22600 e9400 34200 34600 12600 47400 20000 9190 8490 
123700 14300 29300 22600 e10000 34700 33100 13600 47500 21500 8720 7620 
134020 e12500 30600 22200 e12000 34600 31400 13600 47100 22700 7800 7580 
144030 12000 31900 21000 e9400 34200 29300 14300 46700 22500 7270 8070 
153960 12000 32800 19700 e11000 33300 25300 16600 47500 22000 7230 9840 
 
164480 10900 32100 19400 10100 32600 e20100 e20100 49600 20900 7880 8600 
175680 11200 30500 18600 8980 31600 16600 e25200 50600 20500 7720 10200 
186040 13900 29600 17800 9060 30600 14600 27400 50700 19900 6870 11900 
195860 20800 28300 17000 9890 29300 12200 29200 51100 18600 6570 10900 
205220 e23500 27000 14800 11000 28200 12200 30900 51200 16900 7730 8250 
 
215370 27200 24400 13600 11700 26100 12800 32300 51200 14200 8200 7470 
225190 29300 e19500 12600 12500 e23200 13400 33000 50900 13400 8680 6650 
234770 30800 17300 12400 13400 20500 14500 33800 50100 13300 8360 6680 
245430 31900 18200 12100 15400 18900 16400 34200 49100 14000 8700 6390 
254250 32200 19000 12300 16700 15800 17800 38500 48100 13900 10700 6640 
 
264180 32300 19000 11500 17800 14900 17500 39900 46600 13300 20500 6600 
274080 32700 19400 10200 18400 18600 17400 42000 45200 11900 19900 6420 
284220 32600 19300 e9400 18200 22100 18300 42200 43500 9610 e21900 5850 
295260 32400 18800 e9800 18400 e25300 18000 41400 41800 8710 25300 5440 
306330 31700 19000 e7000 --- 29100 17000 41300 40300 9330 25000 4920 
 
315740 --- 19300 e6200 --- 31900 --- 42800 --- 9380 24600 --- 

TOTAL1494905857007287005279003231307966007732007930001419700629130361670367610
MEAN48221952023510170301114025700257702558047320202901167012250
MAX63303270032800237001840034700401004280051200384002530025200
MIN31506650151006200650014200122001260040300871065704920

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 2004, BY WATER YEAR (WY)
MEAN125901437017660194002437033370369503661030580215601375011330
MAX548404890078130595406706094940938007816087690608205085062870
(WY)199419861983199319741985197919701974199319811993
MIN425850475923480841441007010010111706207664957095164
(WY)196520031963196319632003195619881988198819411976

SUMMARY STATISTICSFOR 2003 CALENDAR YEARFOR 2004 WATER YEARWATER YEARS 1939 - 2004
ANNUAL TOTAL5606800 7455830         
ANNUAL MEAN15360 20370         22690         
HIGHEST ANNUAL MEAN46810         1993
LOWEST ANNUAL MEAN8977         1940
HIGHEST DAILY MEAN41600     May 1851200             Jun 20,21123000         May 27 1943
LOWEST DAILY MEAN3150     Oct 73150             Oct 71330         Sep 2 1984
ANNUAL SEVEN-DAY MINIMUM4170     Oct 74170             Oct 72290         Oct 8 1964
MAXIMUM PEAK FLOW51700      A    Jun 21123000      BC
MAXIMUM PEAK STAGE14.08 D    Jun 2128.61 BMay 26 1943
INSTANTANEOUS LOW FLOW2860             Oct 8
10 PERCENT EXCEEDS32500 40000         47600         
50 PERCENT EXCEEDS11900 17900         16000         
90 PERCENT EXCEEDS5200 6410         6490         

A - Gage height, 14.06 ft.

B - At Meredosia.

C - May 26-28, 1943.

D - Discharge, 50,900 ft3/s.



Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data