Station list     Available data
ILLINOIS RIVER BASIN


05536275       THORN CREEK AT THORNTON, IL



LOCATION.-- Lat 41°34'06", long 87°36'28", in SE1/4NW1/4 sec.34, T.36 N., R.14 E., Cook County, Hydrologic Unit 07120003, on right bank at downstream side of bridge on Margaret Street in Thornton, 1.0 mi downstream from North Creek, and at mile 4.2.

DRAINAGE AREA.-- 104 mi2.

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
 

DISCHARGE: May 1948 to current year. Prior to October 1974, records published with those for streams in the St. Lawrence River basin (WSP 1307, 1727, 1911, 2111, WDR IL 1971-74).
 

STAGE: Water years 1994-2001.
SURFACE-WATER QUALITY
 

CHEMICAL: Water years 1979-91.

REVISED RECORDS.-- WSP 1707: Drainage area.

GAGE.-- Water-stage recorder, and phone telemeter. Datum of gage is 586.43 ft above sea level. Prior to Dec. 18, 1948, nonrecording gage at same site and datum.

REMARKS.-- Effluent from sewage-treatment plant upstream consists of publicly supplied water from Lake Michigan and ground water sources.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 4,700 ft3/s, July 13, 1957, gage height, 16.00 ft; maximum gage height, 17.06 ft, June 14, 1981; discharge, 4,140 ft3/s, minimum daily discharge, 4.4 ft3/s, Sept. 11, 1949.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of Apr. 5, 1947, reached a stage of 14.34 ft (from floodmark), discharge, 4,200 ft3/s.

REMARKS FOR CURRENT YEAR.-- Records fair. Effluent from sewage-treatment plant upstream averaged 22.6 ft3/s during the year. The maximum monthly was 38.1 ft3/s in February, and the minimum was 17.7 ft3/s in September.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 42  36  55  44  271  143  55  43  65  30  31  39 
2 41  36  55  44  170  105  50  41  59  29  280  36 
3 40  36  53  44  125  91  49  39  53  53  269  35 
4 260  37  48  44  89  79  49  38  43  51  82  31 
5 108  40  46  45  77  68  49  38  257  36  63  29 
 
6 73  38  44  49  82  64  106  37  394  30  50  30 
7 51  87  43  48  86  77  87  36  234  27  44  62 
8 125  48  43  47  153  95  61  36  130  31  43  41 
9 145  212  44  46  1220  67  65  47  80  28  39  43 
10 76  345  44  45  1500  55  57  50  56  27  54  46 
 
11 53  153  43  45  585  56  56  48  47  27  39  43 
12 45  80  44  45  297  59  84  41  85  25  40  36 
13 41  116  44  48  214  62  61  39  63  24  37  31 
14 38  101  43  61  238  59  53  38  48  25  33  30 
15 40  69  42  142  284  75  161  37  46  27  33  30 
 
16 39  64  44  158  249  157  145  42  42  25  52  31 
17 39  61  48  128  196  215  79  38  40  25  43  29 
18 38  50  46  102  98  251  60  39  36  24  91  32 
19 37  49  46  83  81  227  73  35  33  24  73  129 
20 46  46  45  68  70  168  92  36  33  23  46  56 
 
21 62  44  45  60  61  121  161  51  51  96  40  40 
22 46  42  44  55  58  98  188  43  45  315  37  34 
23 40  44  43  53  54  78  148  42  39  332  39  67 
24 86  44  43  52  259  70  124  47  36  311  35  55 
25 55  44  42  49  1320  61  67  45  33  116  104  58 
 
26 53  65  42  48  662  59  60  100  31  59  122  54 
27 52  58  43  48  328  56  57  311  29  54  54  37 
28 40  53  44  49  238  55  53  178  28  49  40  34 
29 43  58  44  69  ---  53  48  68  31  37  36  33 
30 39  58  43  332  ---  53  44  49  31  34  33  32 
 
31 39  ---  44  350  ---  53  ---  48  ---  32  51  --- 

TOTAL 1932 2214 1397 2501 9065 2930 2442 1780 2198 2026 2033 1283
MEAN 62.3 73.8 45.1 80.7 324 94.5 81.4 57.4 73.3 65.4 65.6 42.8
MAX 260 345 55 350 1500 251 188 311 394 332 280 129
MIN 37 36 42 44 54 53 44 35 28 23 31 29


STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 2001, BY WATER YEAR (WY)
MEAN 59.1 86.3 97.4 100 124 177 179 133 117 74.0 59.4 58.6
MAX 356 385 391 328 421 534 362 399 445 333 236 372
(WY) 1955 1991 1983 1993 1997 1979 1950 1996 1993 1996 1968 1961
MIN 12.5 14.3 15.5 16.2 26.6 37.4 34.0 29.3 24.9 21.7 14.9 11.7
(WY) 1951 1949 1951 1954 1963 1981 1986 1958 1948 1952 1948 1948

SUMMARY STATISTICS FOR 2000 CALENDAR YEAR FOR 2001 WATER YEAR WATER YEARS 1948 - 2001
ANNUAL TOTAL 31999    31801     
ANNUAL MEAN 87.4 87.1   106         
HIGHEST ANNUAL MEAN 199          1993
LOWEST ANNUAL MEAN 51.5       1963
HIGHEST DAILY MEAN 1190        Jun 25 1500          Feb 10 3810          Nov 28 1990
LOWEST DAILY MEAN 20        Jan 29 23          Jul 20 4.4       Sep 11 1949
ANNUAL SEVEN-DAY MINIMUM 22        Jan 25 25          Jul 14 9.0       Sep 14 1948
MAXIMUM PEAK FLOW 1900          Feb 10 4700      A Jul 13 1957
MAXIMUM PEAK STAGE 12.16     Feb 10 17.06 B Jun 14 1981
INSTANTANEOUS LOW FLOW 20          Jul 13-14
10 PERCENT EXCEEDS 180    164      225         
50 PERCENT EXCEEDS 44    49      47         
90 PERCENT EXCEEDS 28    33      23         

A - Gage height, 16.00 ft.
B - Discharge, 4,140 ft3/s.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data