05586100 DATA: Discharge Tables, 2000

Station list Available data
ILLINOIS RIVER BASIN

05586100 ILLINOIS RIVER AT VALLEY CITY, IL

LOCATION.-- Lat 39°42'12", long 90°38'43", in SE1/4NW1/4 sec.34, T.15 N., R.14 W., Scott County, Hydrologic Unit 07130011, on upstream side of Norfolk & Southern Corporation Railroad bridge at Flints Creek, 0.4 mi east of Valley City, 1.8 mi downstream from Mauvaise Terre Creek, and at mile 61.3.

DRAINAGE AREA.-- 26,743 mi², does not include diversion from Lake Michigan through the Chicago Sanitary and Ship Canal, which has occurred since Jan. 17, 1900.

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

DISCHARGE: October 1938 to current year. Prior to October 1960, at site 0.2 mi upstream at same datum. Prior to October 1989, published as "at Meredosia." Records are considered equivalent.

STAGE: Water years 1994-2000.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1975-93 and 1996 to current.

SEDIMENT: Water years 1980-99.

SPECIFIC CONDUCTANCE: Water years 1975-81.

WATER TEMPERATURE: Water years 1975-81.

MISCELLANEOUS: Contaminants in streambed sediments, October 1996; contaminants in fish tissue, October 1996.

BIOLOGICAL: Algae, water years 1980-81; Benthic macroinvertebrates, September 1997, September 1998; fish, August 1998.

GAGE.-- U.S. Army Corps of Engineers water-stage recorder, satellite telemeter and rain gage. Datum of gage is 418.00 ft above sea level (levels by U.S. Army Corps of Engineers).

REMARKS.-- Occasional regulation at low flow by navigation dam at La Grange. Since Jan. 17, 1900, flow has included diversion from Lake Michigan through Chicago Sanitary and Ship Canal. Suspended-sediment samples were collected by a local observer twice weekly with additional samples collected during high runoff periods. Since February 1994, samples used to compute sediment record have been collected at upstream side Rt. 106 bridge at Florence at mile 56.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 123,000 ft³/s, May 26-28, 1943; maximum gage height, 28.61 ft, May 26, 1943; minimum daily discharge, 1,330 ft³/s, Sept. 2, 1984.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 3,720 mg/L, Apr. 14, 1981; minimum daily, 14 mg/L, Dec. 26, 1984, July 21, 1993.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 410,000 tons, June 4, 1980; minimum daily, 172 tons, Sept. 2, 1984.

REMARKS FOR CURRENT YEAR.-- Records 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	13200	5350	7340	6300	e4800	18000	9520	25600	21000	43000	11300	7180
2	10700	4380	7170	7010	e4500	17400	8290	24700	e22300	42200	11300	6750
3	9700	5760	6800	6070	e4500	17300	7640	23800	24200	41300	11800	6360
4	9610	5840	5910	5750	e4700	16900	6650	e22000	25200	40100	13400	6310
5	9890	5440	7000	6280	e5000	16500	8900	e21000	25500	41200	14000	6620

6	9900	5490	10200	6670	e4700	15800	7240	19500	25800	42200	12600	7550
7	9870	5480	11900	5890	e4700	14800	6440	16100	25900	42900	11000	7040
8	8880	5110	10900	6150	e4800	12400	7120	13100	25700	42500	12800	6630
9	5110	5390	9570	6480	e4800	9450	8290	12100	25200	41500	13900	7000
10	5490	5440	9380	6370	e4800	8990	6910	13100	24600	40500	15100	7310

11	6180	5150	10300	5510	5640	10800	6760	15600	24100	41100	15300	7830
12	7220	5750	9700	6860	6830	12200	8160	16200	23900	41200	12900	7960
13	7200	5470	7840	7940	6440	9640	9250	16100	23300	40900	11000	10300
14	8080	5070	6510	8700	6150	7570	7610	16400	23000	40600	8720	12400
15	7520	5270	6980	7610	7100	6980	6170	17400	23000	40200	6910	13600

16	4980	5690	6540	5300	5620	7180	6790	17800	23300	40000	6600	14700
17	4760	5840	6720	6240	6590	9770	7770	17800	24100	39600	8690	14400
18	5210	6840	7040	5860	7550	11500	10000	18200	24600	38600	8170	13400
19	5530	5890	7600	5610	7110	8710	11400	17700	25100	37400	8230	12300
20	5360	5230	6330	4850	7780	8580	12100	17300	25700	36600	8200	11000

21	5630	6420	4950	5500	7850	9920	12800	17700	27900	35400	8320	10800
22	4730	5960	5500	6230	7380	10500	18200	18100	29900	33400	6440	11900
23	4910	5720	5840	4990	7410	11000	e20000	18300	32300	31500	6100	10400
24	5380	5400	5610	5210	7750	11000	23300	21100	33600	29300	8490	10800
25	5760	6370	e5400	4630	9620	9910	24200	23000	35700	26800	9260	12600

26	5280	5630	e5370	5480	13500	9400	25600	e21500	38800	22700	8400	13700
27	5800	6030	5350	e4800	14800	9260	26500	22000	39900	18400	7090	14200
28	5350	6480	5390	e4600	17300	8580	26800	22400	40800	15200	7180	13100
29	5960	7350	5610	e4400	18900	10300	26800	e22600	41900	13000	6250	13000
30	5720	6270	5950	e4500	---	11000	26400	e21900	42900	11400	5970	12500

31	5780	---	6240	e4700	---	10500	---	e21200	---	11300	6960	---

TOTAL	214690	171510	222940	182490	218620	351840	393610	591300	849200	1062000	302380	309640
MEAN	6925	5717	7192	5887	7539	11350	13120	19070	28310	34260	9754	10320
MAX	13200	7350	11900	8700	18900	18000	26800	25600	42900	43000	15300	14700
MIN	4730	4380	4950	4400	4500	6980	6170	12100	21000	11300	5970	6310

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 2000, BY WATER YEAR (WY)
MEAN	12730	14330	17860	19890	24280	33460	37560	36480	29940	21750	13830	11450
MAX	54840	48900	78130	59540	67060	94940	93800	78160	87690	60820	50850	62870
(WY)	1994	1986	1983	1993	1974	1985	1979	1970	1974	1993	1981	1993
MIN	4258	5519	5923	4808	4144	10870	10010	11170	6207	6649	5709	5164
(WY)	1965	1957	1963	1963	1963	1964	1956	1988	1988	1988	1941	1976

SUMMARY STATISTICS	FOR 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1939 - 2000
ANNUAL TOTAL	8474960		4870220
ANNUAL MEAN	23220		13310		22780
HIGHEST ANNUAL MEAN					46810	1993
LOWEST ANNUAL MEAN					8977	1940
HIGHEST DAILY MEAN	61500	Feb 4	43000	Jul 1	123000	May 27 1943
LOWEST DAILY MEAN	4380	Nov 2	4380	Nov 2	1330	Sep 2 1984
ANNUAL SEVEN-DAY MINIMUM	5160	Oct 17	4570	Jan 28	2290	Oct 8 1964
INSTANTANEOUS PEAK FLOW			43800 A	Jun 30	123000 B	C
INSTANTANEOUS PEAK STAGE			12.86 D	Jun 29	28.61 B	May 26 1943
INSTANTANEOUS LOW FLOW			4060	Oct 22
10 PERCENT EXCEEDS	52700		26800		47700
50 PERCENT EXCEEDS	11900		8940		16100
90 PERCENT EXCEEDS	5450		5350		6500

A - Gage height, 12.74 ft.
B - At meredosia.
C - May 26-28, 1943.
D - Discharge, 41,300 ft³/s.