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.
 

EXTREMES FOR CURRENT YEAR.--

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 1,380 mg/L, June 12; minimum daily, 56 mg/L, Nov. 19.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 252,000 tons, May 17; minimum daily, 987 tons, Sept. 16.
SEDIMENT DISCHARGE, SUSPENDED (TONS/DAY), WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
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 10800 322 9330 33600 332 30200 14900 184 7400
2 8980 382 9290 33600 326 29600 14800 148 5930
3 7890 331 7070 33800 285 26000 15500 132 5550
4 7450 272 5480 33700 242 22000 16900 185 8470
5 7460 235 4740 33100 214 19100 16600 244 10800
 
6 8430 261 5950 32300 225 19600 16200 303 13300
7 9680 286 7490 31400 238 20200 16500 340 15100
8 10400 264 7390 30300 251 20500 16600 303 13600
9 10300 229 6330 29100 252 19800 16900 260 11900
10 10200 193 5330 27900 216 16300 17200 220 10200
 
11 8520 172 3970 26800 177 12800 17000 194 8860
12 10700 233 6700 25500 147 10100 16900 169 7710
13 12400 191 6410 24000 139 9010 16300 144 6340
14 14100 169 6460 22600 132 8010 15600 166 6990
15 16300 241 10700 e18300 125 6200 16200 157 6840
 
16 e21600 388 22600 14200 129 4950 16300 144 6350
17 24500 489 32300 12100 140 4600 17100 132 6090
18 25500 488 33600 11100 91 2740 18100 133 6510
19 26500 635 45500 10000 56 1510 e19400 184 9660
20 27400 684 50700 9870 69 1850 e22400 240 14500
 
21 27900 659 49700 10500 86 2430 24100 314 20400
22 28400 524 40100 10100 102 2780 25400 417 28600
23 29100 401 31500 10200 117 3220 26200 359 25300
24 30000 386 31300 11800 125 4000 26900 282 20500
25 30000 378 30700 11200 133 4030 27000 242 17700
 
26 30200 370 30200 11900 142 4550 26200 205 14500
27 30800 362 30200 13600 154 5660 e23200 168 10500
28 31800 347 29800 13900 180 6750 19800 144 7720
29 32500 319 28000 14500 206 8050 18300 185 9120
30 32800 322 28500 14300 217 8420 17400 235 11000
 
31 33400 327 29500 --- --- --- e16000 270 11700
 
TOTAL 616010 --- 646840 615270 --- 334960 587900 --- 359140
 
JANUARY FEBRUARY MARCH
1 e14500 255 10000 26100 795 55900 34200 166 15300
2 e13800 236 8810 27300 792 58300 34200 148 13700
3 e13000 217 7640 30100 580 47100 33600 128 11600
4 e15000 199 8020 32000 404 34800 33400 107 9680
5 e14000 179 6790 33500 364 32900 33100 93 8300
 
6 e13500 158 5770 34600 320 29800 33400 104 9400
7 e13000 137 4800 35300 273 26000 33800 119 10900
8 e14000 118 4460 35600 240 23100 34500 134 12400
9 e12500 119 4020 35700 243 23400 34800 149 14000
10 e12000 122 3960 35400 217 20700 35800 171 16600
 
11 12900 136 4730 35100 193 18200 37800 235 24000
12 13800 183 6850 34800 187 17500 39400 293 31200
13 14200 195 7470 34200 182 16800 40800 259 28600
14 13700 170 6290 33400 183 16500 42000 258 29300
15 12800 159 5520 32300 200 17400 43000 295 34300
 
16 12900 151 5290 31400 169 14300 43600 298 35000
17 12600 143 4860 30700 149 12400 43800 188 22300
18 12000 135 4380 29900 165 13300 43800 170 20100
19 12000 127 4120 28900 132 10300 43200 161 18700
20 11900 119 3830 28400 126 9650 42500 151 17400
 
21 10600 111 3180 28600 218 16800 41400 142 15900
22 9730 103 2710 29900 317 25600 40200 136 14700
23 9850 96 2560 31100 252 21200 39100 137 14400
24 9830 89 2370 32300 194 16900 38100 132 13600
25 10900 96 2840 33100 183 16400 37000 127 12700
 
26 11300 129 3930 33600 167 15100 35600 123 11800
27 10700 109 3140 34100 149 13700 34400 118 10900
28 9930 93 2480 34400 144 13400 33200 113 10100
29 10400 81 2260 --- --- --- 32300 110 9550
30 11400 104 3250 --- --- --- 31000 111 9320
 
31 e21500 413 23900 --- --- --- 30300 113 9270
 
TOTAL 390240 --- 170230 901800 --- 637450 1153300 --- 515020
 
APRIL MAY JUNE
1 29900 119 9650 54500 491 72100 71700 78 15200
2 29900 150 12100 56200 334 50600 69100 72 13500
3 29700 143 11500 57300 207 32000 66300 68 12200
4 29800 142 11400 57400 171 26500 62900 72 12300
5 29800 137 11000 56700 147 22600 60100 89 14400
 
6 29800 116 9330 54900 448 65600 57900 138 21600
7 29800 97 7790 51800 765 108000 56500 181 27600
8 30200 87 7090 49600 277 37000 54900 189 28000
9 32400 118 10400 50200 296 40400 53200 168 24100
10 34700 228 21400 54100 628 91800 51000 149 20600
 
11 36000 267 25900 55800 690 104000 49400 143 19100
12 36600 334 33000 62200 740 124000 48300 1380 180000
13 37300 294 29500 68900 340 63000 52800 821 116000
14 38200 192 19800 70900 212 40400 56800 323 49300
15 38800 166 17300 81000 172 37600 58200 274 43100
 
16 39300 152 16100 90800 464 116000 60400 197 32100
17 39200 164 17400 99400 941 252000 62600 204 34400
18 39200 254 26900 104000 421 118000 64300 195 33900
19 38500 319 33200 105000 213 60400 64500 174 30400
20 38000 298 30600 106000 153 43700 63500 159 27300
 
21 37700 285 29000 105000 134 37900 60900 205 33600
22 39000 325 34200 102000 134 37100 57200 329 50900
23 40100 213 23000 99600 152 40900 54500 277 40800
24 41000 264 29300 96400 212 55100 51900 211 29600
25 42400 526 60400 93300 249 62700 49200 174 23100
 
26 43700 667 78700 90200 231 56200 46300 219 27400
27 44100 547 65300 87600 209 49600 43900 270 31700
28 48800 714 94300 84300 188 42800 41100 320 35500
29 51100 766 106000 80500 146 31900 38500 355 36900
30 52800 647 92300 77300 70 14500 36200 338 33100
 
31 --- --- --- 74300 69 13800 --- --- ---
 
TOTAL 1127800 --- 973860 2377200 --- 1948200 1664100 --- 1097700
 
JULY AUGUST SEPTEMBER
1 34200 320 29500 10200 114 3130 14200 243 9330
2 31800 307 26300 8620 99 2310 12000 207 6730
3 29700 294 23600 8460 88 2000 10000 156 4230
4 25900 281 19700 8340 83 1860 9830 114 3030
5 22000 268 16000 7300 96 1890 9860 108 2880
 
6 19400 284 14900 8880 110 2650 8520 103 2370
7 17400 381 17800 9210 119 2960 7380 91 1810
8 15300 483 20000 8200 113 2500 7180 79 1530
9 13700 540 19900 7310 105 2080 6930 67 1250
10 12900 465 16200 8050 98 2120 6190 59 990
 
11 13000 381 13400 7310 90 1780 6250 66 1110
12 13400 297 10800 7350 83 1640 6700 73 1320
13 13800 227 8460 7370 82 1630 6480 77 1350
14 13800 199 7410 7640 100 2070 6380 72 1240
15 13200 173 6170 8240 119 2650 6010 67 1090
 
16 11500 150 4660 8000 138 2990 5950 61 987
17 9830 137 3650 9310 170 4270 6130 63 1050
18 8630 125 2910 10800 246 7100 6330 85 1460
19 7460 118 2370 12700 381 13100 6010 109 1770
20 7310 127 2500 13400 343 12400 6200 125 2100
 
21 8430 137 3110 12500 245 8310 6190 123 2060
22 8660 146 3430 12000 168 5460 5290 120 1720
23 8720 153 3630 15800 204 9240 6170 117 1950
24 8500 151 3460 23700 430 27600 7440 114 2280
25 8530 148 3410 26400 618 44100 7680 110 2280
 
26 8310 145 3260 28500 579 44600 6260 104 1760
27 10200 143 3940 28800 519 40400 4650 98 1230
28 12200 142 4680 27800 442 33200 5100 92 1260
29 12500 148 5000 26100 360 25400 5600 86 1300
30 12500 155 5250 22000 278 16600 5490 78 1150
 
31 11600 149 4670 17800 224 10800 --- --- ---
 
TOTAL 444380 --- 310070 418090 --- 338840 214400 --- 64617
 
YEAR 10510490 7396927
e Estimated


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data