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.--Decemer 1974 to current year.

PERIOD OF DAILY RECORD.--
SUSPENDED SEDIMENT: Feb. 1980 to current year.

REMARKS.--Suspended-sediment samples were collected by a local observer once weekly with additional samples collected during high runoff periods.

EXTREMES FOR PERIOD OF DAILY RECORD.--
SEDIMENT CONCENTRATIONS: Maximum daily, 3,720 mg/L, Apr. 14, 1981; minimum daily, 14 mg/L, Dec. 26, 1984, July 21, 1993.
SEDIMENT LOADS: Maximum daily, 410,000 tons, June 4, 1980; minimum daily, 172 tons, Sept. 2, 1984.

EXTREMES FOR CURRENT YEAR.--
SEDIMENT CONCENTRATIONS: Maximum daily, 617 mg/L, July 21; minimum daily, 29 mg/L, Oct. 13.
SEDIMENT LOADS: Maximum daily, 98,000 tons, June 22; minimum daily, 588 tons, Oct. 13.
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998
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 6870 62 1150 8490 42 963 13200 93 3380
2 7520 40 823 8800 52 1240 14300 136 5250
3 7090 32 605 8240 54 1210 14200 147 5550
4 6600 40 714 8870 50 1210 12200 139 4580
5 7260 52 1020 9310 47 1180 11600 121 3770
 
6 7940 73 1550 9130 43 1060 11500 98 3070
7 7250 72 1410 8400 41 946 11600 80 2510
8 7280 65 1280 8900 43 1020 11600 65 2050
9 6890 58 1060 8110 44 963 11300 57 1710
10 5980 50 806 7880 45 968 9800 60 1590
 
11 6980 40 753 7950 47 1010 9820 65 1740
12 7720 32 673 7760 48 1000 10700 69 2020
13 7570 29 588 7130 50 956 10900 71 2070
14 6800 38 701 7040 49 935 9950 72 1930
15 7000 51 965 7050 43 829 10000 74 2010
 
16 6850 67 1230 6940 38 713 10800 74 2150
17 6540 77 1370 e7200 35 682 10300 70 1940
18 6740 69 1250 e7600 39 833 10100 66 1790
19 7030 60 1140 7400 44 860 9330 62 1550
20 7090 54 1050 6930 50 932 9370 63 1630
 
21 6740 51 915 6900 54 1010 10800 78 2320
22 6570 48 864 7280 56 1100 10300 89 2440
23 7450 45 915 7580 57 1160 8800 74 1760
24 7020 43 806 7430 58 1160 9710 70 1850
25 6370 43 741 7100 59 1130 10100 69 1900
 
26 6560 52 919 6260 60 991 10800 84 2450
27 5830 57 902 7370 72 1520 11700 124 3970
28 7040 48 915 8720 79 1830 13600 118 4380
29 6710 41 730 8120 61 1360 14000 109 4100
30 7210 34 675 11100 58 1770 14000 101 3850
 
31 8390 33 746 --- --- --- 14200 95 3630
 
TOTAL 216890 --- 29266 236990 --- 32541 350580 --- 84940
 
JANUARY FEBRUARY MARCH
1 e13800 88 3290 28700 81 6180 41400 229 25600
2 12900 80 2760 26600 86 6130 41400 173 19300
3 11800 68 2160 25800 90 6320 40400 132 14300
4 12300 69 2330 26900 95 6860 38900 100 10500
5 15500 81 3460 28000 96 7270 37800 80 8190
 
6 20800 144 8630 28500 98 7510 36900 79 7850
7 24500 279 18600 29000 103 8000 35800 79 7630
8 27900 362 27800 28800 108 8420 35600 90 8810
9 32000 401 34800 28700 112 8670 38600 376 39300
10 34400 351 33100 28400 144 11000 39600 313 33400
 
11 36500 359 35400 29600 380 31300 41300 239 26400
12 37800 343 35200 33500 598 54300 42200 182 20600
13 38900 248 26100 35600 350 33800 42800 139 16100
14 39700 241 25900 37000 323 32400 43400 115 13500
15 40200 172 18600 37400 303 30600 43500 116 13700
 
16 40600 131 14300 37500 280 28300 44200 148 17700
17 40700 134 14800 37600 248 25200 44800 295 35900
18 40800 140 15300 37900 219 22500 47900 477 61800
19 40000 131 14100 38500 194 20200 50100 353 47900
20 39300 87 9270 38800 171 18000 52400 215 30400
 
21 38700 63 6540 39000 150 15700 56700 201 31000
22 37600 71 7150 39300 131 13900 62100 188 31700
23 36600 79 7750 39400 119 12700 66900 172 31100
24 35600 81 7740 39300 119 12700 70100 163 31000
25 34500 82 7620 38800 119 12500 72800 139 27300
 
26 33300 82 7360 38600 220 22800 74200 91 18400
27 32200 78 6790 39700 400 43400 74400 58 11700
28 31100 75 6270 41000 333 36900 73800 58 11500
29 30100 71 5780 --- --- --- 73400 78 15400
30 29200 71 5580 --- --- --- 72700 86 16900
 
31 29200 75 5940 --- --- --- 71300 63 12200
 
TOTAL 968500 --- 420420 957900 --- 543560 1607400 --- 697080
 
APRIL MAY JUNE
1 70500 52 9920 47400 240 30600 51900 106 14800
2 69700 104 19400 48900 244 32200 49200 131 17300
3 68700 116 21500 50700 170 23200 46300 156 19400
4 68600 96 17700 52300 140 19800 43500 178 20800
5 67600 68 12500 53800 121 17600 40800 183 20100
 
6 66600 57 10200 54600 86 12700 38200 162 16600
7 64800 47 8260 54200 96 14000 35900 142 13700
8 62400 49 8160 55500 110 16500 33700 124 11300
9 61800 50 8390 57300 92 14300 32600 113 9930
10 61800 38 6330 60100 92 15100 33100 188 16800
 
11 61200 43 7040 64700 91 15900 32400 257 22500
12 60100 51 8290 69000 64 12100 32500 232 20400
13 58600 73 11600 72500 55 10800 34400 321 29900
14 58600 156 24600 74700 53 10600 36900 376 37800
15 58600 96 15200 75800 52 10700 40500 337 37100
 
16 57400 86 13300 76000 50 10300 43700 305 36300
17 55600 36 5390 75300 68 13800 46900 276 35200
18 54100 36 5260 73900 60 11900 49700 258 34800
19 53200 32 4670 72300 62 12000 52600 287 41100
20 52400 36 5010 70300 66 12500 56800 327 50400
 
21 51700 56 7790 69000 114 21200 58300 439 69100
22 51200 58 8040 65400 220 38700 61000 592 98000
23 50400 46 6230 63500 170 29100 63200 233 39500
24 49600 44 5890 62200 102 17200 64300 91 15800
25 48800 44 5810 62100 185 31100 64500 67 11700
 
26 48200 48 6210 62100 292 48900 63900 48 8110
27 47200 52 6610 61100 130 21500 63000 102 17300
28 46300 56 6940 60400 104 16900 61600 451 74800
29 46300 58 7220 58900 93 14800 61500 487 81100
30 46100 120 14900 56600 91 13900 63400 437 74700
 
31 --- --- --- 54300 89 13000 --- --- ---
 
TOTAL 1718100 --- 298360 1934900 --- 582900 1456300 --- 996340
 
JULY AUGUST SEPTEMBER
1 63400 246 42100 11800 81 2570 10100 126 3410
2 62200 135 22700 11000 98 2890 9410 112 2820
3 60200 87 14100 9860 111 2940 8400 98 2200
4 57500 82 12700 9800 110 2960 7650 85 1740
5 54100 79 11500 12900 139 4950 6920 74 1380
 
6 51900 78 10900 16200 177 7880 6800 64 1180
7 50100 137 18400 20500 226 12800 6570 58 1010
8 49700 507 68300 21800 287 16900 6210 56 929
9 49400 371 49500 21600 366 21600 6770 54 999
10 48300 293 37900 22600 364 22200 8760 52 1260
 
11 48100 272 35300 22400 329 19900 9430 53 1350
12 48000 181 23400 21700 310 18200 8590 62 1400
13 47000 131 16500 21000 264 15000 6860 71 1290
14 46300 122 15200 16800 218 9780 7630 82 1730
15 45600 114 14000 15300 179 7390 6830 91 1640
 
16 44400 106 12700 14300 148 5680 7120 83 1630
17 43200 112 13000 13800 122 4520 7870 79 1670
18 42100 145 16500 12600 120 4080 7460 88 1780
19 40200 167 17900 14700 135 5450 7400 99 1970
20 38000 202 20600 16000 131 5680 6910 114 2110
 
21 35300 617 57900 14200 119 4490 6570 125 2190
22 33000 485 43200 12100 107 3460 6190 115 1930
23 31400 227 19300 10400 97 2680 5960 106 1680
24 29000 142 11100 9080 90 2190 6210 97 1640
25 27100 175 12600 9130 90 2220 6830 89 1650
 
26 24900 223 14800 8950 90 2190 6590 81 1430
27 22500 241 14700 9420 94 2410 5830 74 1170
28 20000 184 9880 10200 99 2730 6120 68 1130
29 16900 139 6270 10900 105 3100 6160 63 1040
30 14200 105 4010 11400 111 3410 5540 61 912
 
31 13000 82 2880 10800 119 3420 --- --- ---
 
TOTAL 1257000 --- 669840 443240 --- 225670 215690 --- 48270
 
YEAR 11363490 4629187
e Estimated


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data