05551700 DATA: Discharge Tables, 2003

Station list Available data
ILLINOIS RIVER BASIN


LOCATION.-- Lat 41°40'18", long 88°26'29" (NAD of 1927), in SE1/4NW1/4 sec.21, T.37 N., R.7 E., Kendall County, Hydrologic Unit 07120007, on right bank 300 ft upstream from bridge on State Highway 47, 2.0 mi north of Yorkville, and at mile 3.3.

DRAINAGE AREA.-- 70.2 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1960 to current year.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.

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

GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 612.34 ft above NGVD of 1929.

REMARKS.-- Diversion about 7 miles upstream near Jericho Rd. that crosses the watershed divide during overbank flow.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE -WATER DISCHARGE AND STAGE: Maximum discharge, 5,510 ft³/s, from rating curve extended above 3,900 ft³/s, July 18, 1996, gage height, 13.16 ft, backwater from debris jam; minimum, 0.10 ft³/s, Dec. 7, 1962, result of freeze up.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharge, 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	7.6	13	11	e10	14	11	16	120	50	9.7	55	4.6
2	9.3	12	15	e10	14	11	14	245	40	8.7	61	5.4
3	13	14	13	11	16	10	14	180	42	8.4	67	4.3
4	13	14	13	11	17	11	23	134	39	7.8	57	3.2
5	20	14	12	e10	17	11	85	182	33	8.4	49	3.3

6	19	14	12	e10	14	11	95	210	30	15	30	3.1
7	15	14	13	e10	14	11	71	152	29	17	40	2.6
8	13	14	12	e9.8	13	11	58	132	34	20	33	1.9
9	11	14	12	e9.0	14	12	47	215	45	27	28	2.1
10	12	15	12	8.6	e13	11	43	298	41	28	25	2.5

11	11	15	12	10	e12	11	43	261	36	23	22	1.8
12	10	15	13	e10	e12	14	37	221	32	18	19	1.7
13	9.7	14	13	e10	e11	29	31	167	29	14	17	1.6
14	9.6	14	14	e11	e11	40	26	138	25	12	15	2.6
15	9.5	16	14	12	e11	23	23	123	22	39	13	2.5

16	10	16	13	13	e11	20	22	110	19	97	11	2.3
17	9.4	14	14	13	e11	20	22	92	18	52	11	1.8
18	9.9	14	18	13	e11	25	21	78	18	80	9.0	1.8
19	11	14	21	e12	e11	23	20	69	22	57	7.8	1.6
20	11	15	21	e12	e11	25	19	70	22	40	6.8	1.3

21	11	16	18	e12	e11	28	19	63	18	35	6.0	1.4
22	10	17	14	e13	e12	25	18	54	15	29	6.5	1.9
23	11	15	12	e12	e11	23	17	48	14	24	5.7	1.9
24	11	14	e11	e11	e11	19	17	43	12	20	4.7	2.9
25	12	14	e11	e12	e11	18	15	38	13	16	4.1	3.4

26	13	14	e10	e12	e11	18	17	33	14	13	4.0	4.2
27	14	14	e10	e11	12	16	15	30	14	16	4.2	5.7
28	14	14	e10	e11	12	17	14	28	12	18	3.9	5.4
29	15	16	e10	e11	---	19	15	32	12	26	3.4	4.9
30	14	14	e10	e12	---	20	20	35	12	23	3.1	4.8

31	13	---	e11	e13	---	17	---	57	---	22	3.4	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 2003, BY WATER YEAR (WY)
MEAN	31.0	41.8	45.8	43.4	61.9	84.4	87.6	77.8	63.8	46.0	28.5	31.0
MAX	126	175	217	146	202	360	249	221	197	381	172	131
(WY)	1973	1986	1983	1993	1997	1979	1979	1974	1974	1996	1987	1987
MIN	5.42	7.44	4.16	4.25	5.46	18.1	27.2	16.7	14.3	8.43	4.21	2.95
(WY)	1964	1964	1964	1977	1963	2003	1963	1989	1977	1961	1991	2003

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR		FOR 2003 WATER YEAR		WATER YEARS 1961 - 2003
ANNUAL TOTAL	17704.1		9319.5
ANNUAL MEAN	48.5		25.5		53.5
HIGHEST ANNUAL MEAN					97.8	1993
LOWEST ANNUAL MEAN					16.7	1977
HIGHEST DAILY MEAN	489	Jun 6	298	May 10	3460	Jul 19 1996
LOWEST DAILY MEAN	7.2	Sep 14	1.3	Sep 20	1.3	Sep 20 2003
ANNUAL SEVEN-DAY MINIMUM	7.5	Sep 10	1.7	Sep 17	1.7	Sep 17 2003
MAXIMUM PEAK FLOW			313	May 10	5510 A	Jul 18 1996
MAXIMUM PEAK STAGE			6.59	May 10	13.16 B	Jul 18 1996
INSTANTANEOUS LOW FLOW			0.65	Sep 20	0.10 C	Dec 7 1962
ANNUAL RUNOFF (CFSM)	0.69		0.36		0.76
ANNUAL RUNOFF (INCHES)	9.38		4.94		10.36
10 PERCENT EXCEEDS	105		49		110
50 PERCENT EXCEEDS	25		14		31
90 PERCENT EXCEEDS	10		5.4		9.9

	A - From rating curve extended above 3,900 ft³/s.
	B - Backwater from debris jam.
	C - Result of freeze up.