05539000 DATA: Discharge Tables, 2004

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 41°30'54", long 88°04'24" (NAD of 1927), in NE1/4SW1/4 sec.15, T.35 N., R.10 E., Will County, Hydrologic Unit 07120004, on left bank at downstream side of Richards Street bridge in Joliet, 0.6 mi downstream from Spring Creek, and at mile 1.6.

DRAINAGE AREA.-- 107.48 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1944 to current year.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1979-91.

REVISED RECORDS.-- WDR IL-91-2: 1981(M).

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 506.00 ft above NGVD of 1929. Prior to Oct. 9, 1946, nonrecording gage at site 0.3 mi upstream at datum 21.00 ft higher. Oct. 9, 1946, to Sept. 30, 1974, at site 0.3 miles upstream at datum 21.00 ft higher. Oct. 1, 1974 to Sept. 30, 2003, at site 0.3 miles upstream at datum 20.00 ft higher.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 17,300 ft³/s, June 13, 1981, gage height, 14.90 ft, from rating curve extended above 6,300 ft³/s, site and datum then in use; maximum gage height, 16.82 ft, June 12, 2004, present site and datum (discharge 4,630 ft³/s); minimum, 0.5 ft³/s, Aug. 9, 16, 19, 1964.

REMARKS FOR CURRENT YEAR.-- Records good except those for 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	21	19	81	e49	e23	67	196	133	812	28	24	113
2	18	252	70	e47	e23	90	146	112	466	26	23	76
3	17	225	65	e45	e24	74	117	73	345	32	32	54
4	17	164	66	e47	e25	99	99	57	211	200	160	45
5	18	510	114	e49	e24	1370	83	50	156	120	127	38

6	17	277	205	e45	e23	718	75	44	115	69	56	34
7	17	147	143	e40	e23	392	67	46	89	47	35	31
8	20	105	117	e35	e22	235	62	47	73	35	28	29
9	16	80	113	e31	e22	172	56	48	65	42	25	26
10	15	70	443	e32	e22	136	52	51	107	72	23	25

11	14	63	378	e33	e23	107	48	47	659	45	21	25
12	14	60	199	e33	e23	81	44	48	3470	34	21	23
13	13	58	132	e32	e23	69	43	425	1350	30	21	22
14	45	51	112	e31	e22	73	39	1140	790	28	20	22
15	78	48	97	e31	e22	70	38	847	489	28	19	25

16	45	47	92	e30	e21	64	37	439	307	26	19	124
17	33	50	86	e29	e21	62	38	265	214	24	19	80
18	26	1040	73	e28	e22	67	38	283	173	24	22	37
19	23	1720	68	e27	e25	77	35	210	145	22	30	28
20	19	769	59	e27	e50	71	43	157	115	22	30	24

21	17	409	56	e26	e200	62	103	128	94	22	28	22
22	17	257	46	e25	172	55	67	164	96	22	23	20
23	16	309	44	e25	187	52	50	895	70	33	21	19
24	17	762	43	e25	180	74	45	423	54	32	40	19
25	38	375	40	e25	128	112	156	364	49	27	47	18

26	44	237	38	e25	96	130	128	246	42	24	147	18
27	27	188	36	e24	73	149	81	161	37	23	298	18
28	23	159	46	e23	61	187	60	118	35	22	1250	17
29	20	130	61	e23	57	698	50	91	33	23	598	17
30	20	98	e65	e22	---	379	64	659	30	26	273	17

31	21	---	e52	e22	---	280	---	1490	---	25	155	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1945 - 2004, BY WATER YEAR (WY)
MEAN	39.6	65.4	78.0	81.3	109	167	172	135	108	59.7	36.9	39.7
MAX	458	359	552	306	416	726	566	488	581	432	144	372
(WY)	1955	1991	1983	1974	1997	1979	1947	1974	1981	1957	1998	1961
MIN	3.05	5.34	3.15	3.89	5.54	18.9	13.8	20.1	10.9	7.17	3.36	4.35
(WY)	1964	1964	1964	1963	1963	1964	1963	1985	1988	1988	1964	1966

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1945 - 2004
ANNUAL TOTAL	35016		49606
ANNUAL MEAN	95.9		136		90.8
HIGHEST ANNUAL MEAN					168	1993
LOWEST ANNUAL MEAN					20.8	1963
HIGHEST DAILY MEAN	1720	Nov 19	3470	Jun 12	8400 B	Jun 13 1981
LOWEST DAILY MEAN	11	A	13	Oct 13	0.80 B	Aug 16 1964
ANNUAL SEVEN-DAY MINIMUM	13	Feb 11	16	Oct 7	1.0 B	Aug 12 1964
MAXIMUM PEAK FLOW			4630	Jun 12	17300 C	Jun 13 1981
MAXIMUM PEAK STAGE			16.82	Jun 12	16.82 D	Jun 12 2004
INSTANTANEOUS LOW FLOW			11	Oct 12	0.50	E
ANNUAL RUNOFF (CFSM)	0.893		1.26		0.845
ANNUAL RUNOFF (INCHES)	12.12		17.17		11.48
10 PERCENT EXCEEDS	212		288		199
50 PERCENT EXCEEDS	36		48		30
90 PERCENT EXCEEDS	15		21		7.8

	A - June 25 and July 2-4.
	B - Site then in use.
	C - From rating curve extended above 6,300 ft³/s, gage height, 14.90 ft, site and datum then in use.
	D - Discharge, 4,630 ft³/s.
	E - Aug. 9, 16, 19, 1964; site then in use.