05525500 DATA: Discharge Tables, 2003

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
	BENTHIC MACROINVERTEBRATES: Water year 1999, and 2002.
	FISH: Water years 1999, and 2002-03.
	HABITAT: Water years 1999, and 2002-03.

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 estimated daily discharges, which are poor.

Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	14	22	21	341	e68	e70	73	151	702	123	134	318
2	14	21	20	230	76	e74	74	145	453	244	122	1520
3	13	21	20	165	85	66	69	130	362	261	146	1610
4	16	20	20	121	e100	68	77	122	308	191	177	704
5	17	23	20	110	e110	89	908	464	258	149	156	302

6	16	27	18	93	e100	128	1160	779	224	949	125	186
7	15	29	18	77	e90	133	960	563	214	2530	107	134
8	15	28	19	80	e80	201	1210	874	199	3220	93	105
9	15	27	17	183	e70	484	1000	2940	185	2720	98	88
10	15	29	17	260	e63	348	753	4210	168	4950	106	74

11	14	58	17	177	e56	223	584	3490	179	6130	88	65
12	14	46	17	261	e50	177	472	2420	584	4380	73	58
13	14	37	18	150	e47	174	387	1400	944	2860	63	53
14	16	36	19	117	e50	167	329	871	1800	1610	59	51
15	14	35	19	102	e52	136	293	1220	1640	1100	56	51

16	14	32	19	95	e50	136	270	968	1110	1080	52	46
17	15	29	18	e87	e44	168	248	730	712	727	48	40
18	15	27	21	e78	e45	185	219	584	496	1660	46	36
19	19	26	37	e68	e47	173	193	488	409	3660	41	35
20	21	26	119	e62	e52	166	199	439	337	3300	38	34

21	21	25	160	e57	e62	186	269	413	289	2020	34	32
22	20	26	124	e53	e80	197	251	378	256	1220	32	34
23	18	25	87	e50	e100	169	211	342	227	717	28	45
24	17	25	64	e49	e130	137	187	307	201	465	24	42
25	18	24	e60	e48	e100	124	188	278	178	339	21	39

26	19	24	e53	e48	e83	117	190	249	165	271	20	40
27	18	23	e43	e50	e75	114	192	223	154	232	19	236
28	18	21	40	e53	e70	114	173	209	143	210	18	489
29	18	22	37	e56	---	109	163	364	135	195	27	214
30	22	22	46	e60	---	89	150	316	128	170	126	130

31	25	---	264	e64	---	77	---	521	---	149	e142	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1948 - 2003, BY WATER YEAR (WY)
MEAN	142	218	355	391	544	644	693	576	494	330	108	110
MAX	1813	1964	1361	2240	1918	1915	1908	1824	1722	1599	814	1250
(WY)	2002	1986	1991	1950	1951	1979	1994	1998	1980	1993	1977	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 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1948 - 2003
ANNUAL TOTAL	165258		121269
ANNUAL MEAN	453		332		383
HIGHEST ANNUAL MEAN					855	1993
LOWEST ANNUAL MEAN					87.2	1954
HIGHEST DAILY MEAN	7330	May 13	6130	Jul 11	15200	Apr 13 1994
LOWEST DAILY MEAN	13	Oct 3	13	Oct 3	2.5	Sep 1 1972
ANNUAL SEVEN-DAY MINIMUM	14	Oct 10	14	Oct 10	2.9	Sep 11 1988
MAXIMUM PEAK FLOW			6670	Jul 11	22900 A	Feb 21 1951
MAXIMUM PEAK STAGE			19.93	Jul 11	28.16 B	Apr 12 1994
INSTANTANEOUS LOW FLOW			13	C	2.0	D
ANNUAL RUNOFF (CFSM)	1.02		0.74		0.86
ANNUAL RUNOFF (INCHES)	13.78		10.11		11.66
10 PERCENT EXCEEDS	1170		816		1000
50 PERCENT EXCEEDS	131		100		128
90 PERCENT EXCEEDS	18		19		11

	A - Gage height, 20.90 ft., from rating curve extended above 8,200 ft³/s.
	B - Discharge, 19,400 ft³/s.
	C - Oct. 1, 3, 4.
	D - Sept. 1, 2, 7, 1972; Oct. 8, 1994.