05552500 DATA: Discharge Tables, 2002

Station list Available data
ILLINOIS RIVER BASIN

05552500 FOX RIVER AT DAYTON, IL


LOCATION.-- Lat 41°23'04", long 88°47'21" (NAD of 1927), 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 1994-2002.
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 NGVD of 1929. 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 NGVD of 1929. 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 CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	1620	3500	2460	e1300	1360	2390	1370	2770	1940	1060	482	823
2	1540	3100	2250	e1400	1200	e2200	1470	2800	1880	1030	410	670
3	1230	2700	2160	e1400	e1150	e1800	1640	2980	1820	970	394	667
4	971	2470	2100	e1320	e1070	e1500	1620	2670	3470	872	468	932
5	1370	2310	2050	e1260	e1130	e1700	1700	2450	14700	912	606	855

6	1600	2260	1970	e1220	e1100	e2100	1670	2340	12200	836	827	804
7	1210	2120	1890	e1200	e1220	2130	1810	2250	8380	795	600	787
8	1050	1940	1810	e1190	1220	3230	2530	2180	6760	767	520	753
9	964	1830	1520	e1180	1160	6060	5530	2240	5930	1140	448	732
10	901	1760	1680	e1190	1430	5910	5700	1880	5360	1860	414	717

11	904	1730	1620	e1220	1810	4390	5050	2380	4950	1180	377	656
12	1140	1710	1450	1230	1840	3940	4670	11700	4690	969	351	632
13	2470	1650	1750	1270	1910	3820	4430	10100	4150	807	379	620
14	7580	1720	2240	1190	2000	3680	4300	6910	3740	755	1530	552
15	6180	1760	2080	1180	1900	3570	4130	5350	3220	711	1990	548

16	4800	1700	1980	1150	1910	3320	3920	4540	2810	676	1310	522
17	3930	1760	2010	1160	1920	3170	3690	5270	2570	648	1060	529
18	3370	1750	2010	1150	1900	3060	3530	4930	2440	608	932	529
19	2940	1770	1950	1140	1890	2890	3190	4380	2290	565	916	557
20	2630	1760	1970	e1160	3070	2770	3360	3970	2080	551	915	578

21	2370	1700	1880	e1180	4160	2460	3340	3620	1940	614	989	730
22	2190	1680	1850	e1200	3900	2110	3320	3080	1830	522	1170	731
23	3140	1660	1870	e1200	3470	1930	3130	2630	1720	362	5060	997
24	5370	1750	1810	1220	3160	2130	2710	2310	1640	409	3750	914
25	5940	2240	e1600	1310	2920	2210	2630	2160	1610	397	3000	844

26	5860	2200	e1300	1120	2800	2200	2260	2010	1470	396	2490	744
27	5350	2130	e1280	1100	2680	1940	2160	1890	1690	459	2120	607
28	4960	2040	e1400	1100	2500	1660	3310	1820	1330	489	1620	574
29	4610	2100	e1350	1130	---	1560	3270	1830	1200	529	1300	567
30	4310	2230	e1230	1170	---	1690	2870	1850	1120	519	1090	560

31	3870	---	e1240	1250	---	1520	---	1940	---	513	963	---

TOTAL	96370	61030	55760	37490	57780	85040	94310	109230	110930	22921	38481	20731
MEAN	3109	2034	1799	1209	2064	2743	3144	3524	3698	739.4	1241	691.0
MAX	7580	3500	2460	1400	4160	6060	5700	11700	14700	1860	5060	997
MIN	901	1650	1230	1100	1070	1500	1370	1820	1120	362	351	522
CFSM	1.18	0.77	0.68	0.46	0.78	1.04	1.19	1.33	1.40	0.28	0.47	0.26
IN.	1.36	0.86	0.79	0.53	0.81	1.20	1.33	1.54	1.56	0.32	0.54	0.29

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1915 - 2002, BY WATER YEAR (WY)
MEAN	1147	1486	1486	1474	2078	3276	3284	2449	1970	1267	937.0	979.3
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 2001 CALENDAR YEAR		FOR 2002 WATER YEAR		WATER YEARS 1915 - 2002
ANNUAL TOTAL	921228		790073
ANNUAL MEAN	2524		2165		1818
HIGHEST ANNUAL MEAN					3940	1993
LOWEST ANNUAL MEAN					330	1934
HIGHEST DAILY MEAN	11800	Feb 10	14700	Jun 5	46600	Jul 19 1996
LOWEST DAILY MEAN	468	Aug 10,14	351	Aug 12	1.0 A	Aug 29 1934
ANNUAL SEVEN-DAY MINIMUM	526	Aug 14	433	Jul 22	120	Oct 8 1956
MAXIMUM PEAK FLOW			16900	Jun 5	55400 B	Jul 19 1996
MAXIMUM PEAK STAGE			14.65	Jun 5	36.47 C	Jan 25 1960
INSTANTANEOUS LOW FLOW			48 D
ANNUAL RUNOFF (CFSM)	0.96		0.82		0.69
ANNUAL RUNOFF (INCHES)	12.97		11.12		9.35
10 PERCENT EXCEEDS	4610		4220		4110
50 PERCENT EXCEEDS	2130		1760		1190
90 PERCENT EXCEEDS	764		612		378

	A - When turbines were shut down; lowest daily mean with plant operating, 78 ft³/s, Oct.
	29, 1956.
	B - 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.
	C - Ice jam.
	D - July 19, 23-27, and Aug. 13.