Station list     Available data
ILLINOIS RIVER BASIN


05586100       ILLINOIS RIVER AT VALLEY CITY, IL



LOCATION.-- Lat 39°42'12", long 90°38'43", 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 1995-2001.
SURFACE-WATER QUALITY
 

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

SEDIMENT: Water years 1980 to current.
 

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 sea level (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.

EXTREMES FOR CURRENT YEAR.--
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 1,300 mg/L, June 6; minimum daily, 36 mg/L, May 16.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 140,000 tons, June 6; minimum daily, 925 tons, Nov. 1.
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001
MEAN MEAN MEAN
MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT MEAN CONCEN- SEDIMENT
DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE DISCHARGE TRATION DISCHARGE
DAY (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY) (CFS) (MG/L) (TONS/DAY)
 
OCTOBER NOVEMBER DECEMBER
1 11300 102 3090 8910 38 925 13600 98 3540
2 10100 107 2910 8200 43 949 13300 90 3260
3 9090 107 2630 7450 47 955 13500 88 3210
4 11200 119 3610 8280 53 1190 12900 87 3030
5 13700 108 4020 9120 63 1560 11000 85 2520
 
6 14000 111 4200 10700 61 1740 11000 78 2300
7 14500 115 4510 9650 52 1360 10700 70 2020
8 14600 131 5130 9230 57 1420 9790 66 1740
9 14400 134 5190 11200 62 1880 10200 72 1970
10 14100 126 4800 14600 68 2670 10200 78 2150
 
11 13100 79 2810 17500 98 4650 10600 84 2410
12 13500 92 3350 18900 174 8890 9880 91 2410
13 12700 73 2490 19900 177 9520 e9500 97 2480
14 11300 61 1880 20100 174 9480 e8500 101 2330
15 11300 62 1880 20500 171 9500 e7000 98 1850
 
16 12000 69 2250 20500 168 9320 e6200 93 1560
17 11700 75 2370 20100 170 9210 e7200 88 1710
18 11200 85 2580 20300 184 10100 e7500 83 1670
19 9810 98 2590 20000 198 10700 e7400 73 1460
20 9440 111 2820 18500 213 10800 e7000 64 1210
 
21 8900 97 2350 17800 222 10700 e6400 54 937
22 8930 48 1150 16500 210 9370 e7200 49 952
23 9560 64 1650 14700 196 7760 e8000 55 1180
24 9700 37 960 12400 182 6320 e8800 61 1450
25 9310 46 1190 12300 168 5560 e9600 67 1720
 
26 8720 67 1570 12800 154 5260 e9500 68 1740
27 9020 69 1670 12200 140 4600 e9200 69 1710
28 9440 57 1440 12100 127 4150 e8300 70 1560
29 10500 46 1290 11900 117 3760 e7700 70 1470
30 10500 45 1260 12600 107 3670 e7400 71 1430
 
31 10200 42 1150 --- --- --- e7200 72 1400
 
TOTAL 347820 --- 80790 428940 --- 167969 286270 --- 60379
 
JANUARY FEBRUARY MARCH
1 e7100 73 1400 32400 592 51600 70200 217 41100
2 e7100 74 1420 37500 512 51700 72500 268 52400
3 e7100 75 1430 39800 436 46800 73000 154 30300
4 e7100 76 1450 41000 360 39800 73300 149 29500
5 e7000 76 1440 41000 290 32100 72500 226 44200
 
6 e7000 77 1460 41100 256 28300 71100 187 35900
7 e7000 78 1480 40500 270 29500 69300 153 28700
8 e6900 79 1470 39800 323 34600 66800 126 22800
9 e6900 80 1490 42600 519 59900 63800 109 18800
10 e6800 81 1480 45200 731 89300 61100 115 18900
 
11 e6900 81 1520 47100 815 104000 58600 108 17000
12 e7100 82 1580 50200 576 78000 56400 100 15300
13 e7300 83 1640 53500 454 65500 54000 113 16500
14 e7600 88 1810 57500 414 64200 51900 185 26000
15 e8200 107 2370 60600 360 58900 50400 261 35500
 
16 e9000 125 3040 62600 291 49200 49900 324 43700
17 e10000 137 3690 62900 227 38600 50200 307 41700
18 e11400 148 4540 63200 182 31200 49600 191 25500
19 e12500 159 5350 62900 154 26200 48600 161 21100
20 e14000 152 5740 61900 157 26300 48300 138 18000
 
21 e15200 76 3110 60800 160 26300 48200 111 14400
22 e17600 60 2830 59500 163 26100 47900 97 12500
23 e17000 59 2710 57900 165 25800 47500 94 12100
24 16500 59 2600 57000 168 25900 46800 92 11600
25 13200 58 2070 59400 227 36500 45700 90 11000
 
26 12600 57 1950 61200 345 57000 44500 87 10400
27 10300 77 2150 63200 186 31800 43200 87 10100
28 10500 245 6950 66600 181 32600 42000 93 10500
29 16900 771 35000 --- --- --- 40700 100 11000
30 28700 1090 83400 --- --- --- 39500 103 11000
 
31 29000 754 59100 --- --- --- 38400 96 9970
 
TOTAL 351500 --- 247670 1468900 --- 1267700 1695900 --- 707470
 
APRIL MAY JUNE
1 36900 89 8870 25500 80 5530 27500 373 27700
2 35500 85 8170 23400 78 4920 28600 404 31200
3 34200 93 8590 20600 64 3560 29300 356 28100
4 32600 108 9510 18900 67 3440 e31000 458 38300
5 31200 141 11900 18600 63 3180 e34000 696 63800
 
6 29600 176 14000 e18200 68 3320 e40000 1300 140000
7 27700 211 15800 e18000 73 3550 e46000 942 116000
8 24900 250 16800 e17600 67 3160 e49000 736 97300
9 21900 262 15700 e17200 55 2580 e51000 610 83900
10 23800 205 13700 e17200 46 2120 e52000 483 67800
 
11 28100 224 17000 e17600 37 1770 e53000 384 54900
12 32000 267 23100 e17800 46 2220 e54000 362 52800
13 34000 306 28100 e18000 51 2460 e54000 354 51700
14 35500 335 32100 e18300 41 2040 54100 390 56900
15 36300 370 36300 e19000 37 1910 53500 454 65600
 
16 36000 324 31500 e19800 36 1900 52600 348 49400
17 35600 251 24200 e21000 45 2550 51800 241 33700
18 35200 179 17000 e22600 71 4340 49900 205 27600
19 34400 138 12800 e24500 105 6900 47600 197 25300
20 33700 151 13700 e26500 124 8890 45400 206 25200
 
21 32800 120 10600 e28000 108 8150 43900 270 31900
22 31900 120 10300 e27500 123 9160 42300 443 50600
23 32000 122 10600 e26500 137 9810 40700 372 40900
24 31200 125 10500 e25500 167 11500 38600 259 27100
25 30500 127 10500 e24000 187 12100 36500 234 23100
 
26 29400 126 10000 21700 207 12100 34400 240 22300
27 28900 126 9870 21200 177 10100 32400 253 22200
28 28100 137 10400 21300 186 10700 30400 244 20000
29 27200 100 7350 21700 208 12200 28900 272 21200
30 26700 88 6310 23500 243 15500 24900 282 19000
 
31 --- --- --- 25800 295 20600 --- --- ---
 
TOTAL 937800 --- 455270 667000 --- 202260 1257300 --- 1415500
 
JULY AUGUST SEPTEMBER
1 21300 230 13400 11200 124 3760 10700 185 5350
2 19800 175 9370 9860 125 3320 10600 173 4980
3 17200 140 6520 9920 129 3450 10600 162 4660
4 15800 163 6920 10800 142 4160 9530 152 3910
5 15000 189 7650 12200 156 5160 9860 146 3900
 
6 16200 205 8950 12900 163 5650 10200 131 3610
7 16300 193 8500 12100 148 4840 8430 143 3240
8 15500 178 7440 10200 131 3600 7010 142 2680
9 14900 164 6580 9370 114 2900 7400 139 2780
10 14800 152 6060 8220 101 2240 8860 137 3270
 
11 14700 147 5820 8320 97 2180 9820 136 3610
12 14300 143 5520 8290 93 2090 10200 142 3910
13 13900 138 5200 8330 90 2020 9810 148 3910
14 12900 134 4670 7870 88 1880 9700 147 3840
15 11900 130 4200 6920 94 1760 9720 126 3310
 
16 10200 130 3560 6720 100 1810 9020 104 2530
17 8600 129 3000 6230 106 1770 7560 82 1680
18 8880 129 3080 6360 107 1840 6910 68 1280
19 8910 128 3080 5950 98 1570 8080 77 1680
20 9530 128 3280 6160 88 1460 8270 116 2720
 
21 8860 127 3040 7460 75 1490 12500 273 9250
22 8620 126 2940 7090 54 1040 13800 303 11300
23 8480 122 2800 14700 243 10700 14200 320 12200
24 8360 108 2440 19200 600 31100 14600 299 11800
25 9210 99 2470 18000 509 24800 15700 271 11500
 
26 11400 109 3340 17000 384 17600 15800 248 10500
27 13400 116 4200 16900 341 15600 15300 242 10000
28 14100 122 4650 15600 303 12800 14100 235 8950
29 13000 123 4330 13900 266 10000 12800 219 7580
30 12000 123 3990 13900 229 8630 11600 194 6070
 
31 11800 124 3950 13000 198 6940 --- --- ---
 
TOTAL 399850 --- 160950 334670 --- 198160 322680 --- 166000
 
YEAR 8498630 5130118
e Estimated


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data