USGS CD-ROM: Current Year Discharge

05536275 THORN CREEK AT THORNTON, IL

LOCATION.--Lat 41°34'05", long 87°36'30", in SE¼NW¼ 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. Effluent from sewage-treatment plant upstream averaged 24.9 ft³/s, and consists of publicly supplied water from Lake Michigan and ground water sources. Maximum monthly effluent was 42.0 ft³/s in March, and minimum was 17.2 ft³/s in October. 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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	27	44	55	41	111	53	587	242	32	59	26	32
2	24	34	41	40	268	50	444	164	38	49	28	32
3	28	32	33	55	258	50	274	114	39	39	26	46
4	46	30	30	707	175	64	168	93	32	460	748	42
5	37	25	27	824	121	74	115	83	29	131	1270	32

6	30	37	26	879	96	68	92	231	29	63	616	29
7	27	33	25	506	84	50	81	1470	26	539	270	397
8	27	32	24	779	78	340	243	2050	26	718	555	153
9	40	32	21	949	69	979	250	1090	92	242	205	71
10	36	29	33	547	67	766	209	517	52	99	116	47

11	30	27	75	289	360	432	136	297	452	62	130	37
12	30	28	61	172	681	269	98	221	533	49	97	31
13	41	27	47	101	342	193	93	188	202	39	49	27
14	50	28	40	85	185	171	153	135	81	35	39	24
15	40	42	37	73	115	156	115	126	81	34	36	24

16	33	49	39	66	94	142	111	90	58	33	36	26
17	31	34	46	60	301	309	88	59	45	31	30	24
18	30	27	45	54	755	1340	70	53	46	28	36	22
19	32	27	48	53	456	1340	59	47	67	72	31	22
20	32	26	48	47	262	777	61	44	44	63	29	36

21	29	26	45	44	167	499	610	40	38	38	27	36
22	27	26	73	42	117	344	469	36	36	109	29	24
23	26	26	142	44	93	219	262	36	33	166	29	23
24	35	30	128	42	102	159	154	36	30	68	90	22
25	34	29	319	39	85	145	109	35	28	43	88	22

26	67	26	248	38	87	129	118	33	520	35	41	23
27	298	30	137	37	91	95	155	34	242	31	34	24
28	88	53	85	39	64	217	111	29	123	33	63	22
29	44	80	67	54	---	162	303	29	68	28	49	20
30	31	73	57	60	---	109	260	30	76	26	37	29

31	30	---	46	62	---	228	---	29	---	28	33	---

TOTAL	1380	1042	2148	6828	5684	9929	5998	7681	3198	3450	4893	1399
MEAN	44.5	34.7	69.3	220	203	320	200	248	107	111	158	46.6
MAX	298	80	319	949	755	1340	610	2050	533	718	1270	397
MIN	24	25	21	37	64	50	59	29	26	26	26	20

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 1998, BY WATER YEAR (WY)
MEAN	60.1	88.2	99.6	98.6	122	183	178	137	113	75.0	59.9	59.4
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 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1948 - 1998
ANNUAL TOTAL	41217		53630
ANNUAL MEAN	113		147		106
HIGHEST ANNUAL MEAN					199	1993
LOWEST ANNUAL MEAN					51.5	1963
HIGHEST DAILY MEAN	2670	Feb 22	2050	May 8	3810	Nov 28 1990
LOWEST DAILY MEAN	21	Dec 9	20	Sep 29	4.4	Sep 11 1949
ANNUAL SEVEN-DAY MINIMUM	25	Sep 10	22	Sep 23	9.0	Sep 14 1948
INSTANTANEOUS PEAK FLOW			2360	May 8	4700 A	Jul 13 1957
INSTANTANEOUS PEAK STAGE			13.07	May 8	17.06 B	Jun 14 1981
INSTANTANEOUS LOW FLOW			16	Sep 28, 30
10 PERCENT EXCEEDS	247		375		227
50 PERCENT EXCEEDS	51		53		47
90 PERCENT EXCEEDS	28		27		22

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