05525500 DATA: Discharge Tables, 2004

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 40°37'48", long 87°43'26" (NAD of 1927), in NW1/4NE1/4 sec.16, T.25 N., R.12 W., Iroquois County, Hydrologic Unit 07120002, on pier at downstream side of bridge on County Highway 9,200 ft downstream from Mud Creek, 1 mi west of Milford, and at mile 23.9.

DRAINAGE AREA.-- 446 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: July 1948 to current year.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91, and 1999 to current year.
	MISCELLANEOUS: Contaminants in streambed sediments, August 1999; contaminants in fish tissue, August 1999.
BIOLOGICAL
	ALGAE: Water years 2002-03.
	BENTHIC MACROINVERTEBRATES: Water years 1999 and 2002.
	FISH: Water years 1999 and 2002-04.
	HABITAT: Water years 1999 and 2002-04.

REVISED RECORDS.-- WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 622.00 ft above NGVD of 1929. Prior to July 23, 1970, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 22,900 ft³/s, Feb. 21, 1951, gage height, 20.90 ft, from rating curve extended above 8,200 ft³/s; maximum gage height, 28.16 ft, Apr. 12, 1994, discharge, 19,400 ft³/s; minimum discharge, 2.0 ft³/s, Sept. 1, 2, 7, 1972, Oct. 8, 1994.

REMARKS FOR CURRENT YEAR.-- Records good except those for Jan. 28 to Mar. 5, which are fair, and estimated daily discharges, which are poor.

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	101	68	373	935	e115	166	2600	110	5500	190	56	2180
2	86	61	307	695	e110	307	1630	110	3380	173	53	903
3	76	59	280	590	e105	273	1050	105	1720	166	49	511
4	77	59	267	776	e100	261	733	101	920	223	69	536
5	72	72	271	2300	e103	1560	546	100	590	286	98	374

6	63	148	295	e1300	e107	2510	452	97	444	198	92	290
7	58	171	345	e850	e110	1610	406	94	355	180	70	237
8	54	138	420	e680	e100	925	361	92	296	178	56	195
9	50	111	457	508	e90	599	305	90	254	143	48	167
10	50	98	501	406	e100	432	260	88	235	671	43	145

11	49	96	747	360	115	358	237	93	1780	1980	39	128
12	47	186	623	347	122	295	212	99	7590	1900	37	117
13	46	449	457	308	112	246	200	108	9860	1220	36	107
14	50	314	386	280	109	222	188	229	6070	642	35	99
15	118	216	335	269	116	204	172	1110	3340	370	32	97

16	163	175	302	237	103	189	162	968	1900	236	30	104
17	136	147	265	228	106	183	156	590	3670	224	29	99
18	110	336	239	229	109	180	148	468	4420	401	61	91
19	97	2590	220	193	163	167	141	948	3080	351	70	86
20	87	3080	186	e185	762	158	142	813	1960	209	66	80

21	78	1830	189	e180	1090	153	159	589	1080	154	74	76
22	75	1080	196	e170	545	139	156	495	668	128	63	73
23	70	731	653	e180	305	134	147	1330	505	114	51	69
24	67	1290	1690	e160	269	136	136	996	417	97	138	66
25	65	1760	1260	e130	234	143	135	842	362	85	1530	64

26	67	1240	737	e140	194	443	134	1200	325	78	4390	62
27	75	860	512	e150	170	2740	125	1020	286	73	5450	60
28	96	669	436	e130	153	2750	119	689	259	67	3730	59
29	96	540	1250	136	147	1910	114	439	230	62	5010	58
30	86	450	2410	133	---	1830	111	619	208	60	6170	55

31	75	---	1560	129	---	2620	---	4190	---	59	4260	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 2004, BY WATER YEAR (WY)
MEAN	140	225	359	392	538	646	688	577	522	330	124	113
MAX	1813	1964	1361	2240	1918	1915	1908	1824	2057	1599	1030	1250
(WY)	2002	1986	1991	1950	1951	1979	1994	1998	2004	1993	2004	1993
MIN	4.55	7.69	5.57	4.06	12.0	64.5	110	56.6	27.2	10.8	6.13	4.27
(WY)	1964	1964	1964	1977	1963	1981	1986	1988	1988	1988	1988	1988

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1948 - 2004
ANNUAL TOTAL	158074		224758
ANNUAL MEAN	433		614		387
HIGHEST ANNUAL MEAN					855	1993
LOWEST ANNUAL MEAN					87.2	1954
HIGHEST DAILY MEAN	6130	Jul 11	9860	Jun 13	15200	Apr 13 1994
LOWEST DAILY MEAN	18	Aug 28	29	Aug 17	2.5	Sep 1 1972
ANNUAL SEVEN-DAY MINIMUM	22	Aug 23	34	Aug 11	2.9	Sep 11 1988
MAXIMUM PEAK FLOW			10400	Jun 12	22900 A	Feb 21 1951
MAXIMUM PEAK STAGE			24.28	Jun 12	28.16 B	Apr 12 1994
INSTANTANEOUS LOW FLOW			26	Aug 17	2.0	C
ANNUAL RUNOFF (CFSM)	0.971		1.38		0.868
ANNUAL RUNOFF (INCHES)	13.18		18.75		11.79
10 PERCENT EXCEEDS	1130		1700		1000
50 PERCENT EXCEEDS	167		189		130
90 PERCENT EXCEEDS	50		64		11

	A - Gage height, 20.90 ft., from rating curve extended above 8,200 ft³/s.
	B - Discharge, 19,400 ft³/s.
	C - Sept. 1, 2, 7, 1972; Oct. 8, 1994.