USGS CD-ROM: Current Year Discharge

05536215 THORN CREEK AT GLENWOOD, IL

LOCATION.--Lat 41°31'50", long 87°36'20", in SW¼SE¼ sec.9, T.35 N., R.14 E., Cook County, Hydrologic Unit 07120003, on right bank 20 ft downstream from abandoned Baltimore and Ohio Chicago Terminal Railroad bridge, 0.7 mi north of Chicago Heights, 0.8 mi south of Glenwood, 1.0 mi upstream from Deer Creek, and at mile 9.2.

DRAINAGE AREA.--24.7 mi².

PERIOD OF RECORD.--May 1949 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 1437: 1955. WDR IL-75-1: Drainage area.

GAGE.--Water-stage recorder. Datum of gage is 610.97 ft above sea level.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream averaged 24.9 ft³/s and consists of publicly supplied water from Lake Michigan and ground-water sources. The maximum monthly effluent was 42.0 ft³/s in March, and the minimum was 17.2 ft³/s in October.

EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Apr. 1947, reached a stage of 12.94 ft, from floodmarks, discharge not determined.

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	18	34	25	e19	e56	e27	148	58	26	30	22	24
2	16	21	20	e26	74	e26	87	47	25	27	21	23
3	19	21	21	e86	64	e33	65	40	32	59	26	35
4	38	20	20	291	e52	e39	53	38	26	145	708	26
5	21	19	20	227	44	e37	45	46	26	43	215	23

6	21	28	19	170	e41	e27	42	105	26	33	69	22
7	18	21	18	105	e39	e60	45	919	24	227	152	185
8	17	20	18	253	e37	e190	76	390	25	83	141	46
9	33	19	18	190	e36	304	71	147	93	47	56	34
10	21	19	31	88	e90	140	57	98	36	36	46	27

11	19	18	35	64	208	89	47	77	282	32	36	25
12	19	17	27	e48	143	69	41	64	116	28	32	24
13	32	17	24	e39	70	65	53	61	54	27	30	23
14	22	17	23	e35	e56	66	54	49	42	26	27	23
15	19	29	23	e32	e49	e55	43	45	38	25	28	25

16	18	23	26	e29	e74	65	38	41	31	25	28	24
17	18	19	26	e28	173	221	35	38	29	24	25	23
18	19	19	25	e26	186	597	33	39	32	24	27	22
19	18	19	e27	e25	84	235	31	34	43	62	25	22
20	20	18	e25	e23	66	124	68	30	29	37	25	44

21	17	19	e28	e22	e56	95	208	30	26	29	23	27
22	17	18	e44	e23	e49	75	87	29	25	97	24	22
23	15	17	e74	e22	e53	65	58	28	24	58	24	21
24	26	18	71	e21	e45	e59	46	29	24	33	76	21
25	20	18	95	e20	e46	48	43	28	24	27	36	21

26	80	18	e56	e19	e48	46	55	26	209	24	28	23
27	93	23	e42	e22	e36	43	47	26	49	25	26	21
28	30	30	e34	e28	e30	93	38	25	53	23	46	22
29	23	40	e27	e30	---	59	101	26	41	22	29	20
30	21	29	e25	e33	---	48	70	27	37	22	26	34

31	19	---	e22	e42	---	134	---	26	---	22	24	---

TOTAL	787	648	989	2086	2005	3234	1885	2666	1547	1422	2101	932
MEAN	25.4	21.6	31.9	67.3	71.6	104	62.8	86.0	51.6	45.9	67.8	31.1
MAX	93	40	95	291	208	597	208	919	282	227	708	185
MIN	15	17	18	19	30	26	31	25	24	22	21	20

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 1998, BY WATER YEAR (WY)
MEAN	26.8	34.3	38.7	35.8	41.6	59.1	60.2	48.9	43.7	33.7	28.9	28.0
MAX	87.1	108	172	97.7	136	188	112	153	138	147	85.2	108
(WY)	1955	1991	1983	1993	1997	1979	1979	1996	1993	1996	1968	1961
MIN	11.0	9.31	11.4	12.0	19.3	20.8	19.3	18.2	12.4	14.0	11.8	9.28
(WY)	1950	1950	1954	1954	1964	1981	1971	1954	1949	1952	1949	1949

SUMMARY STATISTICS	FOR 1997 CALENDAR YEAR		FOR 1998 WATER YEAR		WATER YEARS 1949 - 1998
ANNUAL TOTAL	16288		20302
ANNUAL MEAN	44.6		55.6		40.1
HIGHEST ANNUAL MEAN					67.9	1993
LOWEST ANNUAL MEAN					24.8	1954
HIGHEST DAILY MEAN	1040	Feb 21	919	May 7	1500	A
LOWEST DAILY MEAN	14	Jul 5, 6	15	Oct 23	6.0	B
ANNUAL SEVEN-DAY MINIMUM	18	Oct 17	18	Oct 17	8.5	Sep 5 1949
INSTANTANEOUS PEAK FLOW			1180	May 7	2700 C	Jul 18 1996
INSTANTANEOUS PEAK STAGE			9.82	May 7	11.26 D	Aug 17 1968
INSTANTANEOUS LOW FLOW			4.2	Oct. 26	.00 E	Jun 3 1992
10 PERCENT EXCEEDS	79		97		68
50 PERCENT EXCEEDS	27		31		23
90 PERCENT EXCEEDS	18		19		15

A - Aug. 17, 1968; July 18, 1996 (estimated).
B - July 4, Aug. 21, Sept. 5, 11, 25, 1949.
C - Estimated, gage height unknown.
D - May have been higher during period of no gage-height record, July 17-20, 1996.
E - No effluent from sewage-treatment plant because of temporary equipment repair.