05536275 DATA: Discharge Tables, 1999

Station list Available data
ILLINOIS RIVER BASIN

05536275 THORN CREEK AT THORNTON, IL

LOCATION.--Lat 41°34'05", long 87°36'30", 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.--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).

REVISED RECORDS.--WSP 1707: Drainage area.

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

REMARKS.--Records good except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream averaged 23.4 ft³/s, and consists of publicly supplied water from Lake Michigan and ground water sources. Maximum monthly effluent was 41.5 ft³/s in April, and minimum was 15.8 ft³/s in September. Gage-height telemeter at station.

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

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	40	51	57	e29	134	83	43	230	484	75	31	27
2	27	46	38	e32	190	73	41	120	917	44	24	25
3	62	46	31	e33	207	105	41	94	554	33	22	25
4	33	51	30	e34	145	87	74	83	197	31	22	25
5	26	69	30	e35	118	84	56	73	109	29	23	26

6	49	89	186	e34	107	147	69	97	78	29	23	26
7	40	66	554	e33	100	135	55	84	58	30	24	26
8	30	58	228	e33	97	117	51	67	65	28	25	26
9	25	49	118	e33	90	104	237	62	70	28	23	26
10	23	290	83	e32	102	103	167	55	92	27	22	26

11	24	244	64	e32	125	105	324	76	101	27	28	25
12	23	126	55	e32	105	108	218	199	106	24	43	25
13	23	86	51	e32	80	114	125	417	301	24	39	27
14	22	77	50	e33	72	105	98	184	335	24	29	26
15	26	60	54	e35	68	119	116	109	118	24	25	25

16	26	61	83	40	68	177	899	80	70	25	23	25
17	30	57	55	49	67	397	733	86	52	25	23	25
18	86	52	43	132	60	312	321	89	43	29	22	24
19	53	47	40	96	56	155	158	70	38	27	73	24
20	51	50	36	84	54	119	115	59	35	28	37	24

21	37	44	38	89	53	97	115	53	33	29	30	25
22	32	37	39	769	49	85	292	92	63	59	28	25
23	32	46	40	1540	47	78	1360	118	81	30	26	25
24	30	40	39	1830	69	76	958	124	101	26	54	24
25	28	36	37	964	107	64	365	88	61	24	79	25

26	25	40	35	511	107	60	180	68	40	24	47	25
27	30	35	34	398	112	54	333	56	61	23	40	26
28	124	34	35	511	100	54	1760	50	40	24	33	55
29	68	34	36	308	---	50	946	44	35	24	29	58
30	79	46	35	189	---	46	371	41	31	26	27	37

31	68	---	34	148	---	43	---	44	---	24	26	---

TOTAL	1272	2067	2288	8150	2689	3456	10621	3112	4369	924	1000	833
MEAN	41.0	68.9	73.8	263	96.0	111	354	100	146	29.8	32.3	27.8
MAX	124	290	554	1830	207	397	1760	417	917	75	79	58
MIN	22	34	30	29	47	43	41	41	31	23	22	24

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 1999, BY WATER YEAR (WY)
MEAN	59.7	87.8	99.1	102	122	181	181	136	114	74.1	59.3	58.8
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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1948 - 1999
ANNUAL TOTAL	54687		40781
ANNUAL MEAN	150		112		106
HIGHEST ANNUAL MEAN					199	1993
LOWEST ANNUAL MEAN					51.5	1963
HIGHEST DAILY MEAN	2050	May 8	1830	Jan 24	3810	Nov 28 1990
LOWEST DAILY MEAN	20	Sep 29	22	A	4.4	Sep 11 1949
ANNUAL SEVEN-DAY MINIMUM	22	Sep 23	23	Aug 3	9.0	Sep 14 1948
INSTANTANEOUS PEAK FLOW			2230	Jan 24	4700 B	Jul 13 1957
INSTANTANEOUS PEAK STAGE			12.82	Jan 24	17.06 C	Jun 14 1981
INSTANTANEOUS LOW FLOW			17	Oct 14
10 PERCENT EXCEEDS	411		202		227
50 PERCENT EXCEEDS	58		51		47
90 PERCENT EXCEEDS	28		25		23

A - Oct. 14, Aug. 3, 4, 10, 18.
B - Gage height, 16.00 ft.
C - Discharge, 4,140 ft³/s.