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.--
SUSPENDED-SEDIMENT DISCHARGE: Feb. 1980 to current year.

REMARKS.--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 this record have been collected at upstream side Rt. 106 bridge at Florence at mile 56.

EXTREMES FOR PERIOD OF 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, 937 mg/L, June 3; minimum daily, 38 mg/L, Sept. 4.
SEDIMENT LOADS: Maximum daily, 102,000 tons, June 3; minimum daily, 564 tons, Sept. 12.
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999
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 5470 64 947 10500 120 3400 8840 49 1180
2 6020 70 1140 12200 174 5820 9640 50 1290
3 6350 76 1310 17300 273 13000 9170 60 1480
4 6240 84 1410 22400 324 19600 9350 73 1860
5 7090 91 1750 18700 134 6880 10500 85 2430
 
6 7920 98 2100 13200 62 2210 9940 87 2330
7 8360 101 2280 9650 55 1430 13900 174 6940
8 8310 103 2320 8730 51 1200 17800 334 16000
9 7680 106 2200 9700 116 3220 17600 266 12600
10 9340 105 2650 14600 593 23700 16400 199 8830
 
11 8700 96 2240 18400 377 18600 15900 157 6730
12 7210 89 1730 20100 272 14700 16100 145 6330
13 e7200 90 1750 22300 221 13300 15600 135 5700
14 6470 92 1600 22600 239 14600 14600 126 4980
15 6590 93 1660 21200 247 14100 13400 117 4230
 
16 6290 95 1610 19300 254 13200 10800 108 3170
17 7270 97 1900 16700 243 10900 10500 100 2840
18 7270 98 1930 16700 182 8170 11200 93 2830
19 9400 123 3260 15400 133 5550 9800 86 2290
20 16100 247 10900 14500 105 4100 9550 82 2120
 
21 20000 390 21100 14900 102 4080 9720 86 2250
22 20000 500 27000 13200 100 3540 9070 90 2210
23 18700 598 30200 10500 96 2710 8720 95 2270
24 17600 716 34000 10000 86 2320 8210 100 2220
25 16000 761 32900 11300 77 2340 7300 106 2110
 
26 14000 581 22100 10200 69 1890 6930 111 2080
27 12100 434 14200 9860 62 1660 8100 114 2490
28 10900 325 9550 9970 59 1580 7340 107 2130
29 11300 243 7420 9910 55 1480 6680 100 1810
30 11200 182 5520 9940 52 1400 e7000 94 1780
 
31 11000 136 4020 --- --- --- e7200 88 1710
 
TOTAL 318080 --- 254697 433960 --- 220680 336860 --- 119220
 
JANUARY FEBRUARY MARCH
1 e5600 82 1240 59400 281 45100 32100 92 7950
2 e6000 77 1250 60900 232 38100 30800 99 8180
3 e5600 73 1100 61300 154 25400 29700 105 8460
4 e5700 72 1110 61500 100 16600 28800 113 8750
5 e5800 71 1110 61200 78 12900 28300 120 9190
 
6 e6000 70 1140 60900 93 15400 29100 129 10100
7 e6000 69 1120 59600 93 14900 29900 138 11100
8 e5900 68 1090 59600 91 14700 29300 146 11600
9 e6200 67 1130 59500 89 14200 28700 154 11900
10 e5900 67 1060 55200 87 13000 28600 161 12500
 
11 e5500 66 975 55200 88 13000 28500 140 10800
12 e5400 65 944 54900 103 15200 28800 120 9340
13 e6500 63 1110 54600 106 15600 29000 114 8910
14 e6100 62 1020 54100 126 18400 28900 110 8550
15 e6000 61 986 53400 117 16900 29300 111 8780
 
16 e6500 60 1050 51800 106 14900 28600 112 8690
17 e7000 58 1100 50700 97 13300 26900 114 8280
18 e7200 57 1110 49300 92 12200 26400 116 8240
19 e7200 56 1090 47600 87 11200 28000 117 8870
20 e8600 63 1460 45700 83 10200 29100 119 9350
 
21 e8800 116 2740 44100 79 9380 29700 121 9690
22 e15000 222 8980 42100 75 8500 30000 122 9920
23 32600 426 37500 40600 71 7800 30100 123 10000
24 35800 670 64800 38800 68 7100 29600 120 9560
25 38900 646 67800 37300 64 6490 29200 116 9150
 
26 42400 606 69300 35800 64 6170 28800 112 8740
27 45500 568 69800 34700 71 6660 28000 109 8240
28 48700 498 65500 33100 82 7270 27200 110 8050
29 51800 347 48500 --- --- --- 26200 125 8840
30 54900 287 42700 --- --- --- 24400 144 9470
 
31 57400 371 57500 --- --- --- e22000 165 9820
 
TOTAL 556500 --- 557315 1422900 --- 410570 884000 --- 291020
 
APRIL MAY JUNE
1 20500 190 10500 58800 72 11500 40200 191 20800
2 19900 205 11000 58400 89 14100 40800 649 69600
3 20800 184 10300 58200 73 11400 40500 937 102000
4 21500 164 9520 57500 69 10800 40900 714 78800
5 21500 146 8500 57300 112 17200 41200 543 60400
 
6 21000 135 7640 56200 119 18000 41600 433 48600
7 20200 125 6840 54300 43 6240 42000 428 48500
8 20500 125 6930 53200 41 5870 41900 413 46800
9 21000 152 8570 e51500 63 8740 41700 301 33800
10 21000 186 10600 e50500 63 8570 41600 296 33200
 
11 21200 228 13100 49700 67 8980 42100 319 36200
12 21800 276 16200 49100 83 10900 42200 344 39200
13 21900 292 17200 48900 90 11800 41800 384 43400
14 23000 297 18400 50000 117 15800 42000 440 49900
15 25300 303 20700 51600 140 19500 42800 422 48800
 
16 31600 276 23400 53200 142 20300 44300 364 43600
17 33600 264 24000 55100 198 29500 46300 264 32900
18 36100 483 47100 57300 330 51000 47800 134 17300
19 38800 429 45000 58400 232 36600 49100 140 18600
20 40700 352 38600 58300 142 22300 49600 145 19400
 
21 42500 280 32200 56800 86 13200 49600 149 19900
22 44900 214 25800 55200 96 14200 49100 145 19300
23 47300 118 15100 53000 111 15900 47900 132 17000
24 49300 137 18300 51100 111 15300 47300 142 18100
25 50500 194 26500 49500 129 17300 45800 137 16900
 
26 51200 198 27400 48100 129 16800 44600 117 14100
27 52500 168 23800 46900 118 15000 43400 113 13300
28 54300 124 18200 45000 105 12800 42300 193 22100
29 56600 104 16000 43500 99 11600 41200 257 28600
30 58500 59 9260 42100 132 15000 39600 294 31400
 
31 --- --- --- 41200 160 17800 --- --- ---
 
TOTAL 1009500 --- 566660 1619900 --- 504000 1311200 --- 1092500
 
JULY AUGUST SEPTEMBER
1 39500 236 25200 10100 119 3250 8500 65 1500
2 38500 220 22900 10400 99 2770 7700 52 1080
3 36900 298 29700 11000 85 2520 7570 42 854
4 34800 319 30000 9990 82 2210 7100 38 732
5 32700 337 29700 8510 79 1820 7040 51 958
 
6 30500 316 26100 8020 77 1660 6860 68 1260
7 28500 211 16200 8510 75 1720 6760 81 1470
8 26600 137 9840 8610 74 1720 7200 67 1310
9 e24000 104 6720 8960 74 1780 6790 54 996
10 21300 119 6830 8270 73 1630 6660 46 821
 
11 18200 130 6400 7590 74 1510 6430 43 740
12 16100 142 6150 8090 89 1950 5230 40 564
13 15600 148 6260 11000 124 3720 5320 40 571
14 15300 137 5650 11600 160 5010 6140 46 766
15 13500 126 4580 11900 172 5520 5260 54 769
 
16 11900 115 3700 11500 170 5300 5330 64 915
17 11100 106 3180 10500 139 3960 5680 72 1100
18 10500 99 2800 9520 112 2900 5810 72 1130
19 10100 96 2620 9150 91 2250 6200 73 1220
20 11200 99 3020 8290 73 1640 4940 73 968
 
21 14700 104 4150 8580 62 1440 5650 68 1040
22 14200 100 3850 7710 69 1430 5380 63 920
23 13300 96 3460 8210 110 2440 5660 59 902
24 12400 97 3220 8810 148 3530 5390 55 800
25 11600 110 3470 9930 123 3280 5450 51 749
 
26 11000 127 3770 10200 98 2710 5760 46 719
27 10500 142 4030 9960 79 2120 5150 42 585
28 11300 144 4390 10000 68 1840 5220 40 573
29 11600 146 4560 9770 73 1920 6860 46 849
30 10600 148 4220 9610 80 2060 11200 52 1550
 
31 10100 142 3870 9190 80 1990 --- --- ---
 
TOTAL 578100 --- 290540 293480 --- 79600 190240 --- 28411
 
YEAR 8954720 4415213
e Estimated


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data