05437500 DATA: Discharge Tables, 2004

Station list Available data
ROCK RIVER BASIN

05437500 ROCK RIVER AT ROCKTON, IL


LOCATION.-- Lat 42°26'55", long 89°04'11" (NAD of 1927), in SW1/4NE1/4 sec.24, T.46 N., R.1 E., Winnebago County, Hydrologic Unit 07090005, on right bank 750 ft downstream from State Highway 75 in Rockton, 1.0 mi downstream from Pecatonica River, and at mile 156.1.

DRAINAGE AREA.-- 6,363 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: June 1903 to July 1906, October 1906 to November 1907, January 1908 to March 1909, July 1914 to September 1919, October 1939 to current year. Published as "below mouth of Pecatonica River at Rockton" 1903-9; as "at Rockford" 1914-19. Monthly discharge only for some periods for 1903-1950, published in WSP 1308.
	STAGE: Water years 1994 to current year.
SURFACE-WATER QUALITY
	CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WSP 325: 1903-9. WSP 895: 1904(M). WSP 1508: 1915, 1916-17(M). WDR IL-75-1: Drainage area. WDR IL-97-1: 1996 (Dec. 10-23).

GAGE.-- Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter and raingage, and crest-stage gage. Datum of gage is 707.94 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers). Prior to Oct. 1, 1906, nonrecording gage at site 800 ft upstream at datum about 1 ft higher. Oct. 1, 1906, to Mar. 31, 1909, nonrecording gage at site 800 ft upstream at datum about 2 ft higher. July 30, 1914, to Apr. 30, 1919, nonrecording gage at site at Rockford about 21 mi downstream, at different datum. Oct. 1, 1939, to Aug. 10, 1973, at site 800 ft upstream at same datum.

REMARKS.-- Low flow regulated by power-plant upstream from station.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 32,500 ft³/s, Mar. 30, 1916, gage height, 13.06 ft, site and datum then in use; minimum daily, 501 ft³/s, Sept. 14, 1958.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood in February 1937 reached a stage of 14.6 ft (backwater from ice), from floodmark.

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

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	1050	1820	3750	3830	e1900	5530	9140	4850	18000	11900	5630	3930
2	1370	2170	3600	3820	e1900	5670	8830	4730	18200	11500	5660	3820
3	1180	2810	3620	3400	e1900	5270	8420	4560	18500	11200	5460	3740
4	1140	3790	3710	3250	e1900	5170	7920	4330	18600	11700	5870	3510
5	1150	4450	3630	3030	1980	6500	7450	4140	18300	12300	5850	3390

6	1150	4680	3650	1870	2620	7950	7040	4060	17900	11900	5830	3330
7	1200	4860	3580	3000	2490	8020	6830	3990	17300	11700	5760	3170
8	1260	5190	3520	2850	2430	8410	6590	3710	16600	11400	5520	3280
9	1200	5280	3380	2720	2390	8790	6350	3580	16000	11000	5320	2740
10	1220	4730	4340	e2700	2360	8780	6130	3700	15600	10700	5020	2670

11	1200	4130	5280	e2700	2340	8310	5910	4030	15600	10300	5060	2710
12	1200	3780	5260	e2600	2180	7480	5760	4530	16700	9930	4940	2530
13	1030	3350	e4500	e2600	2120	7130	5590	4740	16800	9620	4930	2690
14	1450	3800	e4100	e2500	2040	6880	5400	5130	16300	9250	4620	2860
15	1540	3630	e4200	e2400	1980	6570	5240	5360	16100	8920	3790	2740

16	1550	3510	e4200	e2300	2010	6590	5070	5340	15800	8630	3760	2730
17	1620	3440	e4000	e2200	2020	6570	5090	5350	16000	8620	3700	2830
18	1720	3430	e3900	e2200	1960	6420	4980	5640	16300	8520	3830	2840
19	1660	3790	e3800	e2100	1950	6140	4610	5890	15900	8220	3700	2730
20	1660	3540	e3900	e2100	2000	6260	4800	5980	15600	8000	3680	2700

21	1590	3810	4190	e2000	2080	6160	5380	6260	15500	7900	3270	2450
22	1570	3810	4190	2090	2280	6040	5520	8990	15600	7790	3340	2250
23	1590	3690	3820	e2100	3030	5850	5790	11900	15200	7820	3220	2220
24	1600	3330	3690	e2100	3970	5980	5780	13100	14900	7580	3030	2100
25	1660	3280	3330	e2100	4170	6140	5740	13500	14700	7380	2890	1980

26	1690	3700	3320	e2100	4440	7050	5440	14400	14200	7000	3260	2250
27	1460	4340	3450	e2000	4570	8100	5280	15700	13700	6680	3420	2260
28	2020	4390	3660	e2000	4830	8430	5060	16200	13300	6340	3720	2250
29	2070	4120	3670	e1900	5290	8810	4800	16200	12800	6040	3810	2260
30	2090	3890	3960	e1900	---	9010	4780	16400	12300	5840	3790	2190

31	2060	---	3950	e1900	---	9240	---	17200	---	5730	4040	---

TOTAL	45950	114540	121150	76360	77130	219250	180720	243490	478300	281410	135720	83150
MEAN	1482	3818	3908	2463	2660	7073	6024	7855	15940	9078	4378	2772
MAX	2090	5280	5280	3830	5290	9240	9140	17200	18600	12300	5870	3930
MIN	1030	1820	3320	1870	1900	5170	4610	3580	12300	5730	2890	1980
CFSM	0.23	0.60	0.61	0.39	0.42	1.11	0.95	1.23	2.51	1.43	0.69	0.44
IN.	0.27	0.67	0.71	0.45	0.45	1.28	1.06	1.42	2.80	1.65	0.79	0.49

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2004, BY WATER YEAR (WY)
MEAN	3113	3529	3296	3199	3859	7192	7279	5426	4731	3770	2909	2878
MAX	13340	11320	9049	9432	8365	13920	18530	17770	16960	17000	9039	7753
(WY)	1987	1986	1983	1960	1997	1974	1993	1973	2000	1993	1993	1972
MIN	857	1100	1004	800	1000	1692	2476	1103	1248	1056	793	780
(WY)	1965	1940	1959	1940	1940	1954	1958	1958	1977	1965	1958	1958

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1940 - 2004
ANNUAL TOTAL	1043806		2057170
ANNUAL MEAN	2860		5621		4265
HIGHEST ANNUAL MEAN					9484	1993
LOWEST ANNUAL MEAN					1568	1958
HIGHEST DAILY MEAN	7930	May 16	18600	Jun 4	29700	Mar 25 1975
LOWEST DAILY MEAN	741	Sep 8	1030	Oct 13	501	Sep 14 1958
ANNUAL SEVEN-DAY MINIMUM	850	Sep 6	1180	Oct 1	622	Oct 2 1958
MAXIMUM PEAK FLOW			18600	Jun 3	30000	Mar 25 1975
MAXIMUM PEAK STAGE			11.11	Jun 4	15.54	Mar 25 1975
INSTANTANEOUS LOW FLOW			708	Oct 13
ANNUAL RUNOFF (CFSM)	0.449		0.883		0.670
ANNUAL RUNOFF (INCHES)	6.10		12.03		9.11
10 PERCENT EXCEEDS	4640		12900		8400
50 PERCENT EXCEEDS	2600		4120		3240
90 PERCENT EXCEEDS	1200		1940		1310