05552500 DATA: Discharge Tables, 2001

ILLINOIS RIVER BASIN

05552500 FOX RIVER AT DAYTON, IL

LOCATION.-- Lat 41°23'04", long 88°47'21", in SW1/4SE1/4 sec.29, T.34 N., R.4 E., La Salle County, Hydrologic Unit 07120007, on left bank under County Highway 18 bridge in Dayton, and at mile 5.2.

DRAINAGE AREA.-- 2,642 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: November 1914 to current year. Prior to April 1925, published as "at Wedron." Monthly discharge only for some periods, published in WSP 1308.

STAGE: Water years 1994-2001.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-92 and 1996.

REVISED RECORDS.-- WSP 730: 1931. WSP 1208: 1930, 1935, 1939. WSP 1308: 1916(M), 1922(M), 1926-31(M), 1934-40(M), 1946-47(M). WDR IL-75-1: Drainage area. WDR IL-76-1: 1969.

GAGE.-- Water-stage recorder, phone telemeter, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 462.30 ft above sea level. Prior to Apr. 13, 1925, nonrecording gage at site 4.1 mi upstream at datum 496.80 ft above Memphis datum. Apr. 13, 1925, to Sept. 30, 1942, nonrecording gage at site 1,000 ft upstream at datum 7.70 ft below sea level. Oct. 1, 1942, to Apr. 10, 1951, nonrecording gage, and Apr. 11, 1951, to Sept. 30, 1978, water-stage recorder, at site 1.000 ft upstream at same datum. Oct. 1, 1978 to June 11, 1997, water-stage recorder at site 500 ft upstream at same datum.

REMARKS.-- Regulation by powerplant upstream from gage.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 55,400 ft³/s, July 19, 1996, gage height, 24.47 ft, from rating curve extended above 43,000 ft³/s; affected by dam failure 500 ft upstream from gage then in use. Maximum gage height, 36.47 ft, Jan. 25, 1960, ice jam; minimum daily discharge, 1.0 ft³/s, Aug. 29, 1934, when turbines were shut down; minimum daily with plant operating, 78 ft³/s, Oct. 29, 1956.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	2390	926	1820	e960	e5000	5380	2480	2810	3050	1240	609	787
2	2150	935	1820	e980	e4000	5080	2310	2680	3450	1090	534	619
3	2010	1010	1780	e1000	e3600	4930	2280	2400	3560	1510	568	572
4	2420	1030	1740	e1000	e3400	4830	2240	2110	3170	1420	517	587
5	2710	1060	e1400	e1000	e3100	4620	2240	2160	3670	1160	570	591

6	2430	1140	e1370	e1010	e2800	4360	2420	2300	5520	1000	625	599
7	2040	1970	e1360	e1020	e2600	4180	2740	1810	4720	919	590	775
8	1860	2680	e1320	e1030	e3300	4020	2500	1710	4050	1000	566	828
9	1750	2870	e1300	e1050	e10900	3880	2490	1690	3670	1010	552	1030
10	1660	5210	e1200	e1070	11800	3740	2600	1720	3420	881	468	1470

11	1460	4770	e1000	e1130	7970	3640	2720	2130	3220	817	605	1570
12	1350	4020	e800	e1170	6360	3670	3450	2990	3160	791	569	1670
13	1290	3780	e900	e1210	5780	3970	3880	2950	3310	753	524	1760
14	1260	3560	e950	e1300	5660	3830	3630	2820	3340	719	468	1760
15	1180	3320	e970	e1380	6250	3990	3880	2750	3710	670	507	1590

16	1150	3130	e1000	e1460	5810	5520	4270	2630	4020	626	542	1220
17	1200	2970	e1010	e1500	4930	5430	3920	2570	4050	607	688	1080
18	1150	2810	e1020	e1700	4590	5190	3690	2490	4050	706	685	1040
19	1150	2560	e1050	e2000	e4400	5020	3530	2410	3950	677	815	2560
20	1030	2390	e1080	e1950	e4300	4820	3480	2340	3610	669	859	3350

21	960	2180	e1100	e1900	e4100	4610	3640	2330	3550	745	834	3030
22	949	2100	e1100	e1850	e4000	4430	3660	2430	3430	700	820	3200
23	1010	2140	e1100	e1800	3780	4220	3590	2310	3060	1090	939	2640
24	1020	2060	e1120	e1700	4940	4020	3680	2240	2620	939	1140	2880
25	1000	1890	e1110	e1700	11400	3800	3490	2270	2380	982	1150	2490

26	997	2030	e1100	e1750	10100	3620	3400	2520	2110	1200	1350	2170
27	981	2020	e1100	e1780	7230	3470	3220	3160	1880	1060	1170	1980
28	977	1870	e1070	e1860	6060	3310	3100	3050	1570	909	961	1880
29	1000	1840	e1000	e2000	---	3130	3000	2810	1440	772	889	1780
30	1000	1860	e980	e4000	---	2970	2900	2640	1310	686	748	1700

31	953	---	e940	e6000	---	2720	---	2550	---	668	902	---

TOTAL	44487	72131	36610	51260	158160	130400	94430	75780	98050	28016	22764	49208
MEAN	1435	2404	1181	1654	5649	4206	3148	2445	3268	904	734	1640
MAX	2710	5210	1820	6000	11800	5520	4270	3160	5520	1510	1350	3350
MIN	949	926	800	960	2600	2720	2240	1690	1310	607	468	572
CFSM	.54	.91	.45	.63	2.14	1.59	1.19	.93	1.24	.34	.28	.62
IN.	.63	1.02	.52	.72	2.23	1.84	1.33	1.07	1.38	.39	.32	.69

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1915 - 2001, BY WATER YEAR (WY)
MEAN	1124	1479	1482	1477	2079	3282	3285	2437	1950	1273	934	983
MAX	5239	5444	7695	4941	5649	11290	9157	7575	6189	5988	4909	5141
(WY)	1955	1986	1983	1960	2001	1979	1979	1974	1996	1996	1924	1972
MIN	141	329	364	335	338	412	418	217	267	174	153	186
(WY)	1957	1954	1940	1940	1934	1934	1934	1934	1934	1934	1934	1946

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1915 - 2001
ANNUAL TOTAL	808136		861296
ANNUAL MEAN	2208		2360		1814
HIGHEST ANNUAL MEAN					3940	1993
LOWEST ANNUAL MEAN					330	1934
HIGHEST DAILY MEAN	10100	Jul 11	11800	Feb 10	46600	Jul 19 1996
LOWEST DAILY MEAN	550 A	Jan 20	468	Aug 10, 14	1.0 B	Aug 29 1934
ANNUAL SEVEN-DAY MINIMUM	643	Jan 15	526	Aug 10	120	Oct 8 1956
MAXIMUM PEAK FLOW			13900 A	Feb 9	55400 C	Jul 19 1996
MAXIMUM PEAK STAGE			14.58 D	Feb 9	36.47 D	Jan 25 1960
INSTANTANEOUS LOW FLOW			74 E	Dec 12
ANNUAL RUNOFF (CFSM)	.84		.89		.69
ANNUAL RUNOFF (INCHES)	11.38		12.13		9.33
10 PERCENT EXCEEDS	4750		4280		4100
50 PERCENT EXCEEDS	1540		1950		1180
90 PERCENT EXCEEDS	800		764		377

	A - Estimated due to backwater from ice.
	B - When turbines were shut down; lowest daily mean with plant operating, 78 ft³/s, Oct. 29, 1956.
	C - Gage height, 24.47 ft, from rating curve extended above 43,000 ft³/s, affected by dam failure 500 ft. upstream from gage then in use.
	D - Ice jam.
	E - Result of freeze up.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data