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.
 

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 1994-2002.

SURFACE-WATER QUALITY
 

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

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.

BIOLOGICAL
 

ALGAE: Water years 1980-81.
 

BENTHIC MACROINVERTEBRATES: Water years 1997-98.
 

FISH: Water year 1998.
 

HABITAT: Water years 1997 and 1998.
 

GAGE.-- U.S. Army Corps of Engineer's water-stage recorder, satellite telemeter and rain gage, 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).
 

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, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 10800  33600  14900  e14500  26100  34200  29900  54500  71700  34200  10200  14200 
2 8980  33600  14800  e13800  27300  34200  29900  56200  69100  31800  8620  12000 
3 7890  33800  15500  e13000  30100  33600  29700  57300  66300  29700  8460  10000 
4 7450  33700  16900  e15000  32000  33400  29800  57400  62900  25900  8340  9830 
5 7460  33100  16600  e14000  33500  33100  29800  56700  60100  22000  7300  9860 
 
6 8430  32300  16200  e13500  34600  33400  29800  54900  57900  19400  8880  8520 
7 9680  31400  16500  e13000  35300  33800  29800  51800  56500  17400  9210  7380 
8 10400  30300  16600  e14000  35600  34500  30200  49600  54900  15300  8200  7180 
9 10300  29100  16900  e12500  35700  34800  32400  50200  53200  13700  7310  6930 
10 10200  27900  17200  e12000  35400  35800  34700  54100  51000  12900  8050  6190 
 
11 8520  26800  17000  12900  35100  37800  36000  55800  49400  13000  7310  6250 
12 10700  25500  16900  13800  34800  39400  36600  62200  48300  13400  7350  6700 
13 12400  24000  16300  14200  34200  40800  37300  68900  52800  13800  7370  6480 
14 14100  22600  15600  13700  33400  42000  38200  70900  56800  13800  7640  6380 
15 16300  e18300  16200  12800  32300  43000  38800  81000  58200  13200  8240  6010 
 
16 e21600  14200  16300  12900  31400  43600  39300  90800  60400  11500  8000  5950 
17 24500  12100  17100  12600  30700  43800  39200  99400  62600  9830  9310  6130 
18 25500  11100  18100  12000  29900  43800  39200  104000  64300  8630  10800  6330 
19 26500  10000  e19400  12000  28900  43200  38500  105000  64500  7460  12700  6010 
20 27400  9870  e22400  11900  28400  42500  38000  106000  63500  7310  13400  6200 
 
21 27900  10500  24100  10600  28600  41400  37700  105000  60900  8430  12500  6190 
22 28400  10100  25400  9730  29900  40200  39000  102000  57200  8660  12000  5290 
23 29100  10200  26200  9850  31100  39100  40100  99600  54500  8720  15800  6170 
24 30000  11800  26900  9830  32300  38100  41000  96400  51900  8500  23700  7440 
25 30000  11200  27000  10900  33100  37000  42400  93300  49200  8530  26400  7680 
 
26 30200  11900  26200  11300  33600  35600  43700  90200  46300  8310  28500  6260 
27 30800  13600  e23200  10700  34100  34400  44100  87600  43900  10200  28800  4650 
28 31800  13900  19800  9930  34400  33200  48800  84300  41100  12200  27800  5100 
29 32500  14500  18300  10400  ---  32300  51100  80500  38500  12500  26100  5600 
30 32800  14300  17400  11400  ---  31000  52800  77300  36200  12500  22000  5490 
 
31 33400  ---  e16000  e21500  ---  30300  ---  74300  ---  11600  17800  --- 

TOTAL 616010 615270 587900 390240 901800 1153300 1127800 2377200 1664100 444380 418090 214400
MEAN 19870 20510 18960 12590 32210 37200 37590 76680 55470 14330 13490 7147
MAX 33400 33800 27000 21500 35700 43800 52800 106000 71700 34200 28800 14200
MIN 7450 9870 14800 9730 26100 30300 29700 49600 36200 7310 7300 4650
e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 2002, BY WATER YEAR (WY)
MEAN 12820 14430 17740 19640 24840 33850 37460 36870 30530 21490 13780 11370
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 5519 5923 4808 4144 10870 10010 11170 6207 6649 5709 5164
(WY) 1965 1957 1963 1963 1963 1964 1956 1988 1988 1988 1941 1976

SUMMARY STATISTICS FOR 2001 CALENDAR YEAR FOR 2002 WATER YEAR WATER YEARS 1939 - 2002
ANNUAL TOTAL 9254780  10510490         
ANNUAL MEAN 25360  28800          22880         
HIGHEST ANNUAL MEAN 46810          1993
LOWEST ANNUAL MEAN 8977          1940
HIGHEST DAILY MEAN 73300      Mar 4 106000              May 20 123000          May 27 1943
LOWEST DAILY MEAN 5950      Aug 19 4650              Sep 27 1330          Sep 2 1984
ANNUAL SEVEN-DAY MINIMUM 6540      Aug 15 6010              Sep 16 2290          Oct 8 1964
MAXIMUM PEAK FLOW 106000      A     May 19 123000      B C
MAXIMUM PEAK STAGE 25.56 D     May 19 28.61 B May 26 1943
INSTANTANEOUS LOW FLOW 4340              Sep 27
10 PERCENT EXCEEDS 51900  57000          48000         
50 PERCENT EXCEEDS 19200  26200          16100         
90 PERCENT EXCEEDS 8330  8030          6540         

A- Gage height, 25.52 ft.

B- At Meredosia.

C- May 26-28, 1943.

D- Discharge, 105000 ft3/s.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data