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
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 6140  6650  30900  19400  e7400  17700  34400  17200  43600  38400  9440  24900 
2 5820  6970  30000  19700  e6500  14900  36500  18100  44500  36800  9090  25200 
3 5030  7600  28600  19700  e6900  14200  38200  18500  45600  35500  9820  25100 
4 4390  8680  e26100  21600  e7200  15100  39300  18500  46000  33600  10400  24700 
5 4770  11600  e18400  23200  e7500  21000  40000  17400  46400  31800  10100  24200 
 
6 4040  15800  17100  23700  e8000  e23900  40100  16200  46900  29800  10300  e23100 
7 3150  17500  16300  22300  e8500  26500  39600  16100  47500  26200  11400  e19700 
8 3520  17300  15400  21500  e9400  29200  38700  16300  47800  e21800  11200  18000 
9 4630  17300  15100  21600  e10000  31400  37700  15800  47700  19400  10800  16200 
10 5720  16400  e18500  22400  e8400  33000  36200  14000  47500  19300  10300  12000 
 
11 4470  15700  e27000  22600  e9400  34200  34600  12600  47400  20000  9190  8490 
12 3700  14300  29300  22600  e10000  34700  33100  13600  47500  21500  8720  7620 
13 4020  e12500  30600  22200  e12000  34600  31400  13600  47100  22700  7800  7580 
14 4030  12000  31900  21000  e9400  34200  29300  14300  46700  22500  7270  8070 
15 3960  12000  32800  19700  e11000  33300  25300  16600  47500  22000  7230  9840 
 
16 4480  10900  32100  19400  10100  32600  e20100  e20100  49600  20900  7880  8600 
17 5680  11200  30500  18600  8980  31600  16600  e25200  50600  20500  7720  10200 
18 6040  13900  29600  17800  9060  30600  14600  27400  50700  19900  6870  11900 
19 5860  20800  28300  17000  9890  29300  12200  29200  51100  18600  6570  10900 
20 5220  e23500  27000  14800  11000  28200  12200  30900  51200  16900  7730  8250 
 
21 5370  27200  24400  13600  11700  26100  12800  32300  51200  14200  8200  7470 
22 5190  29300  e19500  12600  12500  e23200  13400  33000  50900  13400  8680  6650 
23 4770  30800  17300  12400  13400  20500  14500  33800  50100  13300  8360  6680 
24 5430  31900  18200  12100  15400  18900  16400  34200  49100  14000  8700  6390 
25 4250  32200  19000  12300  16700  15800  17800  38500  48100  13900  10700  6640 
 
26 4180  32300  19000  11500  17800  14900  17500  39900  46600  13300  20500  6600 
27 4080  32700  19400  10200  18400  18600  17400  42000  45200  11900  19900  6420 
28 4220  32600  19300  e9400  18200  22100  18300  42200  43500  9610  e21900  5850 
29 5260  32400  18800  e9800  18400  e25300  18000  41400  41800  8710  25300  5440 
30 6330  31700  19000  e7000  ---  29100  17000  41300  40300  9330  25000  4920 
 
31 5740  ---  19300  e6200  ---  31900  ---  42800  ---  9380  24600  --- 

TOTAL 149490 585700 728700 527900 323130 796600 773200 793000 1419700 629130 361670 367610
MEAN 4822 19520 23510 17030 11140 25700 25770 25580 47320 20290 11670 12250
MAX 6330 32700 32800 23700 18400 34700 40100 42800 51200 38400 25300 25200
MIN 3150 6650 15100 6200 6500 14200 12200 12600 40300 8710 6570 4920
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 2004, BY WATER YEAR (WY)
MEAN 12590 14370 17660 19400 24370 33370 36950 36610 30580 21560 13750 11330
MAX 54840 48900 78130 59540 67060 94940 93800 78160 87690 60820 50850 62870
(WY) 1994 1986 1983 1993 1974 1985 1979 1970 1974 1993 1981 1993
MIN 4258 5047 5923 4808 4144 10070 10010 11170 6207 6649 5709 5164
(WY) 1965 2003 1963 1963 1963 2003 1956 1988 1988 1988 1941 1976

SUMMARY STATISTICS FOR 2003 CALENDAR YEAR FOR 2004 WATER YEAR WATER YEARS 1939 - 2004
ANNUAL TOTAL 5606800  7455830         
ANNUAL MEAN 15360  20370          22690         
HIGHEST ANNUAL MEAN 46810          1993
LOWEST ANNUAL MEAN 8977          1940
HIGHEST DAILY MEAN 41600      May 18 51200              Jun 20,21 123000          May 27 1943
LOWEST DAILY MEAN 3150      Oct 7 3150              Oct 7 1330          Sep 2 1984
ANNUAL SEVEN-DAY MINIMUM 4170      Oct 7 4170              Oct 7 2290          Oct 8 1964
MAXIMUM PEAK FLOW 51700      A     Jun 21 123000      B C
MAXIMUM PEAK STAGE 14.08 D     Jun 21 28.61 B May 26 1943
INSTANTANEOUS LOW FLOW 2860              Oct 8
10 PERCENT EXCEEDS 32500  40000          47600         
50 PERCENT EXCEEDS 11900  17900          16000         
90 PERCENT EXCEEDS 5200  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