05536995 DATA: Discharge Tables, 2004

Station list Available data
ILLINOIS RIVER BASIN

05536995 CHICAGO SANITARY AND SHIP CANAL AT ROMEOVILLE, IL


LOCATION.-- Lat 41°38'27", long 88°03'35" (NAD of 1927), in SE1/4SW1/4 sec.35, T.37 N., R.10 E., Will County, Hydrologic Unit 07120004, on left bank 40 ft upstream from bridge on Romeoville Road (135th Street) in Romeoville, 5.2 mi upstream from Lockport Lock and Dam, and at mile 6.2.

DRAINAGE AREA.-- 739 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1984 to current year.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1987-92 and 1999 to 2001.
	WATER TEMPERATURE: Water years 1974-77.

REVISED RECORDS.-- WDR IL-86-2: 1985. WDR IL-89-2: 1986. WDR IL-92-2: 1986-89.

GAGE.-- Acoustical flowmeter and phone telemeter. Datum of gage is 551.89 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark).

REMARKS.-- Estimated daily discharges determined from a regression relation between present site and the previous site 5.2 mi downstream. This gaging station provides flow data essential to determine Illinois' diversion of Lake Michigan water. A U.S. Supreme Court Decree limits Illinois' diversion to an average of 3,200 ft³/s. Illinois' diversion includes water diverted from the lake for domestic water supply, for navigation and water-quality improvement in the Chicago Sanitary and Ship Canal system, and the stormwater runoff from a 673 mi² diverted watershed area. Flows recorded at this station also include nondiversion flows.

EXTREMES FOR PERIOD RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 19,466 ft³/s, Feb. 21, 1997, gage-height, 23.95 ft; maximum gage-height, 26.43 ft, Feb. 4, 1996, discharge, 2,876 ft³/s; no flow or periods of reverse flow at times in most years.

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

Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	1732	1531	2153	1799	1930	2241	3029	2005	6562	2836	3010	3157
2	1430	4284	1442	1393	1539	2182	2685	2119	3334	2673	2885	2863
3	2057	4760	1408	1377	1955	2485	2277	1722	4208	5933	3860	2806
4	1435	5154	2090	1415	1481	4505	1918	1575	2864	4927	5677	2723
5	1559	5878	2805	1895	1172	8992	1876	1889	4305	4566	4968	2624

6	1547	3883	2776	2486	2123	5352	2328	1894	3366	4061	3400	2396
7	1666	3338	2753	1569	1381	5018	1539	1795	3269	3707	4233	1900
8	1586	1943	2133	1295	2154	3023	1685	1909	3017	3852	3775	2306
9	1628	2963	3346	1287	1741	3089	1730	1748	2996	5048	2791	2121
10	1559	2091	4159	1330	1156	3256	1667	2139	5605	4106	3492	2522

11	2478	1368	3672	1793	1444	2117	1446	1477	7632	4370	2816	2339
12	1576	2136	2940	1481	1439	2097	1771	3080	8877	2741	3157	1969
13	1766	1440	2494	1791	1950	2313	1453	4652	4866	4090	3228	2461
14	4212	1958	2332	1236	1332	2578	1665	6990	6078	2798	3166	2184
15	2299	1339	1922	1672	1150	1859	1447	4371	4511	3485	3013	3733

16	2415	1365	2105	1616	1651	1637	1842	3519	4994	3612	3146	2823
17	1950	3187	1669	1545	1378	1855	2370	3894	2845	3042	3491	2804
18	2057	10200	2005	1905	1900	2411	1773	3068	4358	3544	2372	2208
19	2064	5818	1443	1574	1322	1953	e1700	3378	3209	3206	2693	2350
20	2196	5016	1690	1354	2937	2069	e3294	4115	3687	3249	3051	2039

21	1691	3484	2134	1762	2496	1712	2013	e4576	3750	4103	3200	1889
22	1616	3140	1349	1273	2700	1873	1869	e6457	3511	4377	2439	1840
23	1660	4153	1303	1709	2531	1870	2688	e6626	3513	3353	2858	2297
24	2500	4030	1513	1710	2474	2482	2382	e4541	3239	3840	4106	1903
25	2107	3894	1724	1924	2104	2710	2470	3601	2462	3049	3579	1703

26	2371	2009	1653	1499	2574	2897	2199	3551	3163	3247	2380	1837
27	1883	2751	1492	1758	1802	3038	1743	3062	3175	3608	4301	1932
28	1707	2192	1774	1476	2223	3589	2225	2875	2592	3328	10721	1983
29	1362	2671	1873	1470	1940	3975	1751	3054	2785	3128	4695	3314
30	1547	1958	1442	1343	---	4468	2225	7486	3038	3020	4106	2426

31	1813	---	1566	1580	---	3048	---	8485	---	2729	3423	---

TOTAL	59469	99934	65160	49317	53979	92694	61060	111653	121811	113628	114032	71452
MEAN	1918	3331	2102	1591	1861	2990	2035	3602	4060	3665	3678	2382
MAX	4212	10200	4159	2486	2937	8992	3294	8485	8877	5933	10721	3733
MIN	1362	1339	1303	1236	1150	1637	1446	1477	2462	2673	2372	1703

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1985 - 2004, BY WATER YEAR (WY)
MEAN	3107	2909	2550	2641	2834	3089	3372	3544	3845	3986	4212	3816
MAX	5244	5243	3991	4347	4975	4789	5194	5493	6405	5426	6830	5182
(WY)	1987	1986	1988	1993	1997	1985	1992	1990	1993	1986	1987	1986
MIN	1918	1471	1604	1275	1298	1734	2035	2370	2455	2699	2917	2382
(WY)	2004	2003	2003	2003	2003	2000	2004	1994	2003	2002	2000	2004

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1985 - 2004
ANNUAL TOTAL	925543		1014189
ANNUAL MEAN	2536		2771		3327
HIGHEST ANNUAL MEAN					4113	1986
LOWEST ANNUAL MEAN					2342	2003
HIGHEST DAILY MEAN	10200	Nov 18	10721	Aug 28	17870	May 10 1990
LOWEST DAILY MEAN	1009	Feb 9	1150	Feb 15	915 A	Nov 20 2001
ANNUAL SEVEN-DAY MINIMUM	1160	Feb 8	1450	Feb 10	1160	Feb 8 2003
MAXIMUM PEAK FLOW			14643 B	Aug 28	19466 C	Feb 21 1997
MAXIMUM PEAK STAGE			26.16 D	Mar 29	26.43 E	Feb 4 1996
INSTANTANEOUS LOW FLOW			38	Jan 8	F
10 PERCENT EXCEEDS	4240		4370		5020
50 PERCENT EXCEEDS	2200		2390		2960
90 PERCENT EXCEEDS	1260		1470		1880

	A - Estimated by regression.
	B - Gage height, 21.38 ft.
	C - Gage height, 23.95 ft.
	D - Discharge, 3,515 ft³/s.
	E - Discharge, 2,876 ft³/s.
	F - No flow or periods of reverse flow at times in most years.