05536275 DATA: Discharge Tables, 2001

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.