05536275 DATA: Discharge Tables, 2000

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.