05536215 DATA: Discharge Tables, 2004

Station list Available data
ILLINOIS RIVER BASIN

05536215 THORN CREEK AT GLENWOOD, IL


LOCATION.-- Lat 41°31'49", long 87°37'20" (NAD of 1927), in SW1/4SE1/4 sec.9, T.35 N., R.14 E., Cook County, Hydrologic Unit 07120003, on right bank 20 ft downstream from Cook County Forest Preserve bike trail, 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.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: 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).
	STAGE: Water years 1994 to current year.

REVISED RECORDS.-- WSP 1437: 1955. WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder. Datum of gage is 610.97 ft above NGVD of 1929.

REMARKS.-- Effluent from sewage-treatment plant 1 mi 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, 2,700 ft³/s (estimated), July 18, 1996, gage height unknown; maximum recorded gage height, 11.26 ft, Aug. 17, 1968, may have been higher during period of no gage-height record, July 17-20, 1996; minimum daily, 6.0 ft³/s, July 4, Aug. 21, Sept. 5, 11, 25, 1949.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of Apr. 1947, reached a stage of 12.94 ft, from floodmarks, discharge not determined.

REMARKS FOR CURRENT YEAR.-- Records good except those for Oct. 1 to Nov. 17, which are fair, and those for extimated daily discharges, which are poor. Effluent from sewage-treatment plant upstream averaged 23.1 ft³/s during the year. The maximum monthly average was 32.8 ft³/s in March and the minimum was 16.5 ft³/s in September.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	17	17	28	23	21	64	e61	59	102	20	18	27
2	15	81	26	23	22	72	e44	38	61	21	19	24
3	19	39	26	23	22	44	e39	32	48	54	33	23
4	18	72	27	23	21	106	e38	29	41	119	115	23
5	16	180	65	28	21	435	e36	29	37	34	30	21

6	17	48	53	23	21	108	e35	27	33	28	23	21
7	15	34	43	21	21	68	e33	29	31	25	21	21
8	15	26	38	21	20	52	e32	28	29	24	20	20
9	14	24	40	21	20	43	e31	28	27	24	19	20
10	15	22	96	21	20	37	e31	44	57	24	19	19

11	14	22	63	22	20	35	e30	49	61	23	18	19
12	17	20	42	25	19	31	e29	54	489	23	18	20
13	16	19	34	23	20	30	e30	119	91	23	18	19
14	97	19	32	22	20	38	e30	182	90	24	18	19
15	29	19	30	21	19	31	e29	85	55	22	17	44

16	27	21	32	21	19	32	e34	52	43	21	17	107
17	20	24	28	24	19	35	e38	40	36	21	18	29
18	18	592	27	23	20	38	e30	57	33	21	20	24
19	17	276	25	21	26	35	e31	40	30	21	29	23
20	16	80	24	21	68	33	e38	35	28	21	25	22

21	15	56	24	21	59	29	e39	32	42	49	20	20
22	16	45	24	21	47	27	e29	151	33	35	18	20
23	16	105	24	21	58	e35	e28	151	28	28	18	18
24	15	113	25	21	57	e36	e44	91	26	22	60	19
25	51	62	23	21	41	e51	e58	120	25	20	113	20

26	21	45	23	21	34	e92	e32	62	24	20	77	20
27	18	38	23	21	31	e67	31	46	23	19	105	20
28	19	34	26	20	29	e114	30	37	24	19	271	19
29	17	31	26	20	29	e203	28	34	22	19	79	19
30	17	30	25	20	---	e95	45	256	21	21	42	18

31	18	---	24	20	---	e121	---	341	---	20	32	---

TOTAL	655	2194	1046	677	844	2237	1063	2377	1690	865	1350	738
MEAN	21.1	73.1	33.7	21.8	29.1	72.2	35.4	76.7	56.3	27.9	43.5	24.6
MAX	97	592	96	28	68	435	61	341	489	119	271	107
MIN	14	17	23	20	19	27	28	27	21	19	17	18

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2004, BY WATER YEAR (WY)
MEAN	27.3	34.5	37.8	35.8	42.2	57.8	60.4	50.5	44.8	34.6	29.5	27.8
MAX	87.1	108	172	97.7	136	188	120	153	138	147	85.2	108
(WY)	1955	1991	1983	1993	1997	1979	1999	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 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1949 - 2004
ANNUAL TOTAL	14746		15736
ANNUAL MEAN	40.4		43.0		40.3
HIGHEST ANNUAL MEAN					67.9	1993
LOWEST ANNUAL MEAN					24.8	1954
HIGHEST DAILY MEAN	690	Jul 21	592	Nov 18	1500	A
LOWEST DAILY MEAN	14	Oct 9,11	14	Oct 9,11	6.0	B
ANNUAL SEVEN-DAY MINIMUM	15	Oct 5	15	Oct 5	8.5	Sep 5 1949
MAXIMUM PEAK FLOW			867	Nov 18	2700 C	Jul 18 1996
MAXIMUM PEAK STAGE			9.07	Nov 18	11.26 D	Aug 17 1968
INSTANTANEOUS LOW FLOW			10	E	0.00 F	Jun 3 1992
10 PERCENT EXCEEDS	66		79		69
50 PERCENT EXCEEDS	24		27		24
90 PERCENT EXCEEDS	19		19		16

	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 - Several days.
	F - No effluent from sewage-treatment plant because of temporary equipment repair.