05552500 DATA: Discharge Tables, 2000

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 1994-2000.

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, 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 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	2180	672	946	e740	e810	2950	1120	3000	7880	2500	2390	803
2	2060	706	869	e720	e800	2830	1020	2840	6500	2260	2600	763
3	1880	668	767	e720	e800	2690	970	2500	6040	3160	2270	741
4	2100	671	851	e720	e800	2590	944	2150	5670	4550	1870	737
5	2110	663	1320	e730	e800	2390	914	1850	5760	3890	1730	684

6	1810	648	2090	e700	e800	2230	904	1720	5960	3480	1920	742
7	1560	691	1630	e700	e800	2110	908	1620	5680	3550	2310	679
8	1300	733	1420	e700	e800	1940	911	1550	5380	3450	2300	649
9	936	707	1360	e720	e800	1710	1170	1770	5080	3130	1920	587
10	942	737	1380	e710	e800	1270	1080	2300	4760	8180	1800	652

11	937	755	1330	e760	e800	1190	1030	2890	4530	10100	1640	636
12	881	894	1290	e800	e800	936	1060	3950	4810	6770	1560	1400
13	820	773	1250	e730	e800	961	1030	3860	5810	5400	1510	2330
14	781	829	1210	e700	e800	917	1010	3340	6680	4760	1430	1850
15	783	841	1260	e710	e800	922	971	3060	7040	4260	1340	1930

16	804	823	1180	e740	e810	909	970	2950	6820	3890	1290	1870
17	747	831	1190	e690	e810	888	1630	2910	6570	3410	1140	1780
18	802	820	1040	e650	e820	942	1980	2860	6360	3060	1380	1690
19	782	857	944	e600	e830	832	1710	3980	6090	2840	1200	1640
20	765	840	941	e550	e880	957	5970	4380	5890	2680	1110	1600

21	799	905	602	e560	e980	1140	8620	4210	5920	2380	1050	1760
22	798	938	e1000	e760	1150	1180	7390	4210	5260	2090	1020	2000
23	779	1040	e820	e800	1560	1050	5930	4290	4770	1800	991	2780
24	773	1110	e810	e810	2800	1190	5300	4270	4680	1540	1030	3260
25	812	1060	e800	e810	4020	1210	4750	4140	6610	1430	1120	3150

26	790	1080	e800	e810	3760	1190	4330	4020	6030	1280	1100	3120
27	679	1030	e800	e820	3570	1180	4020	4060	4660	1150	1010	3050
28	644	938	e780	e830	3340	1150	3770	4550	3810	1080	941	2950
29	705	1010	e780	e840	3140	1210	3520	4260	3270	1100	895	2850
30	693	938	e770	e830	---	1270	3220	3990	2810	1250	853	2680

31	647	---	e740	e820	---	1160	---	4750	---	1690	849	---

TOTAL	33099	25208	32970	22780	40480	45094	78152	102230	167130	102110	45569	51363
MEAN	1068	840	1064	735	1396	1455	2605	3298	5571	3294	1470	1712
MAX	2180	1110	2090	840	4020	2950	8620	4750	7880	10100	2600	3260
MIN	644	648	602	550	800	832	904	1550	2810	1080	849	587
CFSM	.40	.32	.40	.28	.53	.55	.99	1.25	2.11	1.25	.56	.65
IN.	.47	.35	.46	.32	.57	.63	1.10	1.44	2.35	1.44	.64	.72

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1915 - 2000, BY WATER YEAR (WY)
MEAN	1121	1468	1486	1475	2038	3271	3287	2437	1935	1277	936	975
MAX	5239	5444	7695	4941	5461	11290	9157	7575	6189	5988	4909	5141
(WY)	1955	1986	1983	1960	1997	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 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1915 - 2000
ANNUAL TOTAL	861095		746185
ANNUAL MEAN	2359		2039		1807
HIGHEST ANNUAL MEAN					3940	1993
LOWEST ANNUAL MEAN					330	1934
HIGHEST DAILY MEAN	12100	Apr 24	10100	Jul 11	46600	Jul 19 1996
LOWEST DAILY MEAN	436	Sep 25	550 A	Jan 20	1.0 B	Aug 29 1934
ANNUAL SEVEN-DAY MINIMUM	479	Sep 16	643	Jan 15	120	Oct 8 1956
INSTANTANEOUS PEAK FLOW			11200	Jul 11	55400 C	Jul 19 1996
INSTANTANEOUS PEAK STAGE			12.43	Jul 11	36.47 D	Jan 25 1960
INSTANTANEOUS LOW FLOW			171	Sep 8
ANNUAL RUNOFF (CFSM)	.89		.77		.68
ANNUAL RUNOFF (INCHES)	12.12		10.51		9.29
10 PERCENT EXCEEDS	5350		4700		4100
50 PERCENT EXCEEDS	1380		1180		1180
90 PERCENT EXCEEDS	669		730		376

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.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data