Station list     Available data
ILLINOIS RIVER BASIN


05525000       IROQUOIS RIVER AT IROQUOIS, IL

 

LOCATION.-- Lat 40°49'22", long 87°34'53" (NAD of 1927), in NE1/4SE1/4 sec.15, T.27 N., R.11 W., Iroquois County, Hydrologic Unit 07120002, on left bank at upstream side of bridge on U.S. Highway 52 in Iroquois, 500 ft upstream from a railroad bridge, 4.5 mi downstream from Indiana-Illinois State line, and at mile 50.4.

 

DRAINAGE AREA.-- 686 mi2.

 

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

 

DISCHARGE: October 1944 to current year.

 

STAGE: Water years 1994 to current year.

SURFACE-WATER QUALITY

 

CHEMICAL: Water years 1978-91. Additional chemical data for water years 1972-77 are published in Water-Resources Investigations 78-23 and 79-24 as site FL 04.

 

SEDIMENT: October 1978 to September 1980, January 1993 to December 1995.

 

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 614.34 ft above NGVD of 1929. Prior to Aug. 5, 1945, nonrecording gage at same site and datum.

 

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 10,400 ft3/s, June 13, 1958, gage height, 26.31 ft; minimum, 5.2 ft3/s, Sept. 13, 1964.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 2,280 mg/L, June 2, 1980; minimum daily, 3 mg/L, Dec. 23, 24, 27-31, 1978.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 12,200 tons, June 3, 1980; minimum daily, 0.45 ton, Dec. 28, 1978.

 

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES
DAYOCTNOVDECJANFEBMARAPRMAYJUNJULAUGSEP
 
137 49 52 125 e62 e145 194 211 383 221 1550 217 
237 48 52 143 e70 e145 187 244 331 208 1260 559 
335 47 53 127 e77 e140 181 297 305 190 1080 681 
437 48 52 99 e100 137 182 296 320 172 1010 559 
539 47 48 87 e130 147 365 361 336 260 948 401 
 
640 48 50 e80 e190 160 719 637 317 1180 839 294 
743 50 49 e72 e175 174 770 690 295 2180 694 235 
843 53 47 e76 e150 191 841 599 280 3350 560 201 
941 52 47 89 e135 241 844 912 264 5160 465 180 
1039 54 46 115 e125 332 747 1540 245 8180 402 164 
 
1138 57 45 161 e115 306 618 1870 234 9590 355 153 
1238 70 46 131 e105 267 512 2010 264 9830 320 144 
1338 78 47 116 e98 242 428 1950 469 9510 290 137 
1438 73 48 e100 e96 237 366 1750 1130 8850 267 135 
1539 66 50 e90 e95 218 330 1540 1330 8100 247 135 
 
1640 61 50 e80 e95 188 309 1290 1220 7510 232 135 
1740 59 50 e72 e97 177 288 1060 958 6660 231 130 
1840 58 52 e66 e100 187 267 862 688 6310 233 121 
1942 57 59 e62 e105 204 248 688 521 6010 212 114 
2043 57 87 e58 e115 224 244 572 417 5340 190 110 
 
2148 57 113 e55 e125 254 308 499 349 4630 176 107 
2250 56 108 e52 e140 284 378 453 306 4190 166 109 
2347 56 92 e49 e160 286 348 415 275 3980 155 116 
2443 57 77 e47 e180 259 300 381 248 3810 145 127 
2541 57 71 e45 e200 241 274 350 224 3590 137 137 
 
2640 57 62 e43 e165 259 264 322 205 3320 132 154 
2742 57 69 e42 e153 294 246 299 189 3010 127 254 
2846 55 67 e43 e147 287 227 283 179 2710 122 467 
2947 53 68 e46 --- 264 213 307 192 2410 122 452 
3046 51 68 e51 --- 236 205 320 224 2110 127 348 
 
3147 --- 81 e55 --- 210 --- 364 --- 1830 132 --- 

TOTAL128416881906247735056936114032337212698134401129267076
MEAN41.456.361.579.91252243807544234336417236
MAX50781131612003328442010133098301550681
MIN3547454262137181211179172122107
CFSM0.060.080.090.120.180.330.551.100.626.320.610.34
IN.0.070.090.100.130.190.380.621.270.697.290.700.38

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1945 - 2003, BY WATER YEAR (WY)
MEAN26433652461381310621077856734492144182
MAX25561878179430302213346231161956349643365952020
(WY)199419861968195019501982195020021958200319901993
MIN10.618.016.920.627.794.824914153.723.411.411.7
(WY)195719571964194519631957194619581988198819881964

SUMMARY STATISTICSFOR 2002 CALENDAR YEARFOR 2003 WATER YEARWATER YEARS 1945 - 2003
ANNUAL TOTAL212562     219672     
ANNUAL MEAN582     602     590     
HIGHEST ANNUAL MEAN1323     1993
LOWEST ANNUAL MEAN121     1964
HIGHEST DAILY MEAN4420         May 159830         Jul 1210200     Jun 14 1958
LOWEST DAILY MEAN35         Oct 335         Oct 35.5  Sep 13 1964
ANNUAL SEVEN-DAY MINIMUM37         Sep 2738         Oct 16.6  Sep 8 1964
MAXIMUM PEAK FLOW9920         Jul 1210400     Jun 13 1958
MAXIMUM PEAK STAGE25.74    Jul 1226.31Jun 13 1958
INSTANTANEOUS LOW FLOW34         Oct 3,45.2  Sep 13 1964
ANNUAL RUNOFF (CFSM)0.850.880.86
ANNUAL RUNOFF (INCHES)11.5311.9111.68
10 PERCENT EXCEEDS1760     1200     1610     
50 PERCENT EXCEEDS208     175     264     
90 PERCENT EXCEEDS47     47     34     



Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data