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.
 

PARTIAL RECORD: Annual maximum, water years 1921 to 1938.

SURFACE-WATER QUALITY
 

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

DISSOLVED OXYGEN: Water years 2001-2003.
PH: Water years 2001-2003.
 

SEDIMENT: February 1980 to current year
 

SPECIFIC CONDUCTANCE: Water years 1975-81, 2001-2003.
 

TURBIDITY: Water years 2001-2003.
 

WATER TEMPERATURE: Water years 1975-81, 2001-2003.
 

MISCELLANEOUS: Contaminants in streambed sediments, October 1996; contaminants in fish tissue, October 1996; sediment concentration and particle size, water years 1996-2005.

BIOLOGICAL
 

ALGAE: Water years 1980-81, 1996-98, and 2002 to current year.
 

BENTHIC MACROINVERTEBRATES: Water years 1997-98, 2002 to current year.
 

FISH: Water year 1998, 2003 to current year.
 

HABITAT: Water years 1997-98, 2003, 2005.
 

GAGE.-- U.S. Army Corps of Engineer's water-stage recorder and satellite telemeter, and crest-stage gage. Datum of gage is 418.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers) (417.65 ft NAVD 1988). 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 local observers generally 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 2004 TO SEPTEMBER 2005
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 4480  17400  38000  21000  58300  46800  24100  20200  9910  3040  e8200  5810 
2 4150  25500  40100  22700  55600  45700  25500  19600  8930  3290  e5200  5760 
3 4680  26300  41800  25300  52800  44600  26200  19000  8670  4020  4050  5800 
4 4520  28600  42900  32200  50200  43500  26600  18700  8800  3300  3900  5880 
5 4870  31800  43700  37900  48000  42400  26600  17600  7950  3370  3750  6040 
 
6 4570  33800  45500  40900  46100  41200  26400  16200  7820  3860  3820  5810 
7 4630  35400  47800  44000  44300  40100  26000  14800  8520  4160  4320  5860 
8 4660  35500  49800  47400  42900  38900  24500  14100  8860  4020  3960  5920 
9 4220  34200  51200  49600  42200  37900  e22000  14000  8440  3830  4550  5750 
10 4730  33000  53100  51700  41900  36700  20500  13100  9190  4150  4850  6010 
 
11 4860  31700  55200  53600  41600  35300  19800  13300  9180  3230  4760  6130 
12 5090  30400  56400  55500  41600  34500  20500  14000  9080  3260  4750  6230 
13 5110  28900  56600  60500  42500  33500  25200  15300  9410  3770  4620  6260 
14 5150  25900  56800  66500  44900  32400  25000  14600  9580  3380  4940  5940 
15 5360  e21500  56500  70300  46500  31300  24600  13700  9080  3020  6110  5220 
 
16 5010  17800  55600  77400  47500  30600  23000  14200  9350  3070  6540  6010 
17 4260  13900  54500  84600  48900  29700  21900  14000  10300  2880  6540  6160 
18 5310  12700  53400  89400  49500  28900  21200  13100  11000  3100  6520  6700 
19 6240  11700  52100  91400  50100  27900  e20600  12100  10600  3010  6580  7710 
20 5890  11600  50300  92600  51000  26600  20200  11800  8860  3630  6530  6260 
 
21 6210  11300  48100  92600  51400  25100  20000  14100  7940  3820  6620  5210 
22 6380  12100  45800  91300  51900  23500  19900  15700  6940  3590  7830  6170 
23 5130  13100  43100  88600  51900  e21500  22600  15400  5770  3940  9500  6840 
24 5360  e14300  40400  86600  51500  20100  24400  15300  4840  4300  9650  7960 
25 10700  17200  e36500  83000  50800  19600  25100  15400  4370  4740  8890  8880 
 
26 12200  18900  e34000  79400  49900  19500  24200  14400  4100  4010  7700  7110 
27 13700  e22200  e31000  75700  48800  20300  22700  12200  3620  4020  5760  6320 
28 15800  27700  e28000  71900  48000  22800  22100  10900  2750  e7000  5770  6130 
29 16400  32400  e26000  68200  ---  24500  e21400  10700  3150  e11000  5920  5980 
30 14500  35700  e24000  64700  ---  24700  20300  10300  3940  e10500  5510  7000 
 
31 13000  ---  21900  61400  ---  24000  ---  10300  ---  e9600  5570  --- 

TOTAL 217170 712500 1380100 1977900 1350600 974100 693100 448100 230950 135910 183210 188860
MEAN 7005 23750 44520 63800 48240 31420 23100 14450 7698 4384 5910 6295
MAX 16400 35700 56800 92600 58300 46800 26600 20200 11000 11000 9650 8880
MIN 4150 11300 21900 21000 41600 19500 19800 10300 2750 2880 3750 5210
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 2005, BY WATER YEAR (WY)
MEAN 12510 14510 18060 20060 24720 33340 36740 36280 30240 21310 13630 11250
MAX 54840 48900 78130 63800 67060 94940 93800 78160 87690 60820 50850 62870
(WY) 1994 1986 1983 2005 1974 1985 1979 1970 1974 1993 1981 1993
MIN 4258 5047 5923 4808 4144 10070 10010 11170 6207 4384 5709 5164
(WY) 1965 2003 1963 1963 1963 2003 1956 1988 1988 2005 1941 1976

SUMMARY STATISTICS FOR 2004 CALENDAR YEAR FOR 2005 WATER YEAR WATER YEARS 1939 - 2005
ANNUAL TOTAL 8301710  8492500         
ANNUAL MEAN 22680  23270          22700         
HIGHEST ANNUAL MEAN 46810          1993
LOWEST ANNUAL MEAN 8977          1940
HIGHEST DAILY MEAN 56800      Dec 14 92600              Jan 20,21 123000          May 27 1943
LOWEST DAILY MEAN 4150      Oct 2 2750              Jun 28 1330          Sep 2 1984
ANNUAL SEVEN-DAY MINIMUM 4560      Oct 1 3160              Jul 14 2290          Oct 8 1964
MAXIMUM PEAK FLOW 93500      A     Jan 20 123000      B C
MAXIMUM PEAK STAGE 21.30 D     Jan 21 28.61 B May 26 1943
INSTANTANEOUS LOW FLOW 2370              Jul 1
10 PERCENT EXCEEDS 46500  51800          47700         
50 PERCENT EXCEEDS 18800  15400          16000         
90 PERCENT EXCEEDS 6810  4200          6440         

A - Gage height, 21.17 ft.

B - At Meredosia.

C - May 26-28, 1943.

D - Discharge, 91900 ft3/s.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data