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 1994-2000.
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 except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream averaged 21.5 ft3/s during the year. The maximum monthly was 35.1 ft3/s in June, and the minimum was 14.9 ft3/s in November.
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
 
1 29  e25  e20  23  21  76  22  65  548  88  61  e27 
2 27  e33  e20  23  25  63  23  82  182  60  46  e29 
3 48  e34  e29  27  27  55  24  63  91  128  44  e29 
4 111  e29  57  32  29  51  28  48  65  114  37  e29 
5 43  e20  540  27  28  48  26  42  253  94  57  e30 
 
6 29  e20  244  26  26  44  35  39  170  51  133  e30 
7 29  e22  88  23  28  41  101  38  112  45  290  e30 
8 34  e23  62  21  28  42  169  37  93  40  121  e30 
9 24  e21  52  34  30  41  95  86  51  38  66  e29 
10 21  e21  60  58  39  36  60  218  40  237  49  e32 
 
11 22  e21  48  65  46  33  62  138  38  246  41  187 
12 20  e21  45  68  41  34  47  115  320  145  37  493 
13 19  e22  40  67  38  33  38  81  448  83  35  135 
14 21  e21  46  34  34  34  32  61  541  83  32  102 
15 18  e21  68  29  31  42  28  45  590  51  30  59 
 
16 17  e21  77  26  33  48  36  43  208  43  29  50 
17 22  e31  52  26  35  38  499  42  103  38  142  42 
18 23  e28  37  27  37  33  185  43  71  33  88  e31 
19 20  e22  34  25  40  48  198  103  53  34  44  e31 
20 19  e22  31  25  45  105  503  64  173  31  38  e31 
 
21 e20  e22  28  24  48  85  964  47  1140  31  e33  e36 
22 e20  e21  26  24  118  63  582  42  619  30  e33  41 
23 e20  e22  25  25  162  50  279  43  260  30  e33  70 
24 e22  57  26  26  231  47  192  38  220  29  e31  63 
25 e23  e31  25  21  196  37  129  36  1190  27  e30  52 
 
26 e21  e23  24  23  120  34  103  33  843  27  e30  45 
27 e20  e20  25  23  164  41  86  33  345  27  e30  42 
28 e20  e20  26  23  105  48  71  67  242  28  e33  40 
29 e21  e20  25  20  97  36  63  43  167  146  e30  39 
30 e21  e20  27  22  ---  29  56  54  100  243  e32  40 
 
31 e21  ---  23  23  ---  24  ---  179  ---  106  e30  --- 

TOTAL 825 734 1930 940 1902 1439 4736 2068 9276 2406 1765 1924
MEAN 26.6 24.5 62.3 30.3 65.6 46.4 158 66.7 309 77.6 56.9 64.1
MAX 111 57 540 68 231 105 964 218 1190 246 290 493
MIN 17 20 20 20 21 24 22 33 38 27 29 27

e Estimated
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 2000, BY WATER YEAR (WY)
MEAN 59.0 86.6 98.4 100 121 179 181 135 118 74.2 59.3 58.9
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 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1948 - 2000
ANNUAL TOTAL 38643  29945         
ANNUAL MEAN 106  81.8       106         
HIGHEST ANNUAL MEAN 199          1993
LOWEST ANNUAL MEAN 51.5       1963
HIGHEST DAILY MEAN 1830      Jan 24 1190              Jun 25 3810          Nov 28 1990
LOWEST DAILY MEAN 17      Oct 16 17              Oct 16 4.4       Sep 11 1949
ANNUAL SEVEN-DAY MINIMUM 20      Oct 10 20              Oct 10 9.0       Sep 14 1948
INSTANTANEOUS PEAK FLOW 1390              Jun 25 4700      A Jul 13 1957
INSTANTANEOUS PEAK STAGE 11.57         Jun 25 17.06 B Jun 14 1981
INSTANTANEOUS LOW FLOW 14      C     Oct 12
10 PERCENT EXCEEDS 193  175          226         
50 PERCENT EXCEEDS 41  38          46         
90 PERCENT EXCEEDS 22  21          23         
A - Gage height, 16.00 ft.
B - Discharge, 4,140 ft3/s.
 C - May have been less during the period, Oct. 21 to Dec. 3.


Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data