05568000 DATA: Discharge Tables, 2001

ILLINOIS RIVER BASIN

05568000 MACKINAW RIVER NEAR GREEN VALLEY, IL

LOCATION.-- Lat 40°27'15", long 89°36'22", in SE1/4SE1/4 sec.12, T.23 N., R.5 W., Tazewell County, Hydrologic Unit 07130004, on right downstream side of bridge on Towerline Road, 2.5 mi east of State Highway 29, 3.9 mi northeast of Green Valley, 5.8 mi south of Pekin, 10.2 mi north of U.S. Highway 136, and at mile 17.3.

DRAINAGE AREA.-- 1,073 mi². Area at site used prior to Oct. 1, 1988, 1,089 mi².

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

DISCHARGE: March 1921 to October 1956; October 1988 to current year.

STAGE: Water years 1994-2001.

PARTIAL RECORD: Annual maximum, water years 1957-88.

SURFACE-WATER QUALITY

CHEMICAL: October 1997 to September 1998.

SEDIMENT: October 1994 to September 1997.

MISCELLANEOUS: Contaminants of streambed sediment, July 1997; contaminants of fish tissue, July 1997; streambank sediment size, October 1997; Streambed sediment size, October 1997.

BIOLOGICAL

BENTHIC MACROINVERTEBRATES: Water year 1996.

FISH: Water year 1997.

HABITAT: Water year 1996.

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and rain gage, and crest-stage gage. Datum of gage is 477.10 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Jan. 17, 1933, chain gage at site 3.5 mi downstream on railroad bridge at datum 2.00 ft higher. Jan. 17, 1933, to May 13, 1940, chain gage, and May 14, 1940 to Sept. 30, 1952, wire-weight gage at site 3.6 mi downstream at datum 2.00 ft higher. Oct. 1, 1952 to Oct. 31, 1956, wire-weight gage, and Nov. 1, 1956 to Sept. 30, 1988, crest-stage gage at site 3.6 mi down stream at present datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 51,000 ft³/s, Dec. 6, 1982, gage height, 16.13 ft (backwater from ice), site then in use; maximum recorded gage height, 28.29 ft, Sept. 16, 1993 (discharge unknown); minimum discharge observed, 17 ft³/s, Oct. 26, 27, 1940.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 6,160 mg/L, May 27, 1996; minimum daily, 4 mg/L, May 11, 1997.
SUSPENDED-SEDIMENT LOADS: Maximum daily 99,800 tons, May 27, 1996; minimum daily, 0.83 tons, Dec. 21, 1996.

REMARKS FOR CURRENT YEAR.-- Records good except those for Apr. 12-19, which are fair, and those for Aug. 7-21 and estimated 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	36	25	52	e33	e1900	2450	674	839	1010	331	83	62
2	34	26	50	e34	e1800	1980	642	800	1310	306	83	53
3	33	25	47	e35	1510	1660	600	748	1160	340	82	51
4	39	27	45	e37	1230	1430	557	688	1200	430	79	47
5	55	26	44	42	989	1270	636	658	1240	384	70	45

6	50	29	40	44	834	1140	893	633	3050	369	e71	47
7	40	63	44	45	872	1050	1370	620	3710	309	69	49
8	40	51	42	44	1230	988	2210	586	3150	274	67	45
9	38	48	39	46	7380	928	1650	556	2350	251	64	44
10	35	82	43	43	6950	870	1540	523	1900	236	71	50

11	35	90	51	42	5840	833	2950	557	1600	244	61	43
12	38	97	56	43	3550	818	3830	528	1370	223	55	41
13	33	93	53	44	2350	823	3130	489	1200	199	52	39
14	31	79	47	50	2060	798	2280	472	1060	177	50	36
15	32	72	48	59	2140	781	1870	479	963	159	48	35

16	35	70	48	74	2170	1050	1610	478	855	147	44	33
17	30	64	e42	70	1820	1550	1360	477	772	136	50	33
18	27	62	e39	66	1470	1870	1180	3500	713	133	38	34
19	26	60	e36	e64	1260	1860	1080	2050	657	128	42	62
20	26	58	e34	e61	1120	1640	1030	1640	601	123	43	53

21	26	50	e32	e59	975	1410	1040	1330	631	120	47	47
22	25	51	e32	e57	873	1240	1750	1130	625	123	54	48
23	25	51	e31	e56	819	1110	2190	972	583	128	126	50
24	26	49	e31	e54	1330	1010	1810	857	530	168	126	53
25	28	51	e30	e53	5930	921	1550	772	483	142	113	46

26	28	57	e30	e52	6300	851	1410	744	447	143	109	41
27	26	61	e30	e51	5850	807	1240	747	416	126	92	38
28	26	52	e30	e50	3910	772	1090	765	392	109	78	35
29	25	53	e31	187	---	750	962	759	372	100	67	33
30	23	54	e31	1440	---	727	884	678	356	92	61	32

31	23	---	e32	e1800	---	700	---	703	---	86	70	---

TOTAL	994	1676	1240	4835	74462	36087	45018	26778	34706	6236	2165	1325
MEAN	32.1	55.9	40.0	156	2659	1164	1501	864	1157	201	69.8	44.2
MAX	55	97	56	1800	7380	2450	3830	3500	3710	430	126	62
MIN	23	25	30	33	819	700	557	472	356	86	38	32
CFSM	.03	.05	.04	.15	2.48	1.08	1.40	.81	1.08	.19	.07	.04
IN.	.03	.06	.04	.17	2.58	1.25	1.56	.93	1.20	.22	.08	.05

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1921 - 2001, BY WATER YEAR (WY)
MEAN	293	409	449	694	979	1084	1332	1282	876	559	277	346
MAX	3525	3417	2425	3514	3066	3629	4996	5756	2704	3109	2404	6057
(WY)	1927	1927	1928	1993	1927	1993	1944	1943	1999	1951	1924	1993
MIN	19.8	21.8	26.3	29.6	34.1	49.3	68.8	79.9	53.2	37.1	28.6	23.7
(WY)	1941	1941	1941	1940	1931	1931	1931	1934	1934	1988	1988	1940

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1921 - 2001
ANNUAL TOTAL	55831		235522
ANNUAL MEAN	153		645		718
HIGHEST ANNUAL MEAN					2353	1993
LOWEST ANNUAL MEAN					98.4	1940
HIGHEST DAILY MEAN	2260	May 28	7380	Feb 9	23500	Apr 24 1944
LOWEST DAILY MEAN	23	Oct 30-31	23	Oct 30-31	17	A
ANNUAL SEVEN-DAY MINIMUM	25	Oct 28	25	Oct 28	18	Oct 21 1940
MAXIMUM PEAK FLOW			7800	Feb 9	51000 B	Dec 6 1982
MAXIMUM PEAK STAGE			24.26	Feb 9	C	Sep 16 1993
INSTANTANEOUS LOW FLOW			23	Oct 30-31	17 D	A
ANNUAL RUNOFF (CFSM)	.14		.60		.67
ANNUAL RUNOFF (INCHES)	1.94		8.17		9.09
10 PERCENT EXCEEDS	349		1700		1780
50 PERCENT EXCEEDS	60		113		252
90 PERCENT EXCEEDS	32		33		43

	A - Oct. 26-27, 1940.
	B - Gage height, 16.13 ft, backwater from ice, site then in use.
	C - Maximum recorded, 28.29 ft; discharge unknown.
	D - Observed.

Table of Contents

Introduction

Station Descriptions

Surface-Water Data

Ground-Water Data

Meteorological Data

Biological Data