05435500 DATA: Discharge Tables, 2001

Station list Available data
ROCK RIVER BASIN

05435500 PECATONICA RIVER AT FREEPORT, IL

LOCATION.-- Lat 42°18'10", long 89°37'10", in SE1/4 sec.30, T.27 N., R.8 E., Stephenson County, Hydrologic Unit 07090003, on right bank on property of Commonwealth Edison Company in Freeport, 0.3 mi upstream from Stephenson Street Bridge, 5 mi upstream from Yellow Creek, and at mile 61.9.

DRAINAGE AREA.-- 1,326 mi².

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

DISCHARGE: September 1914 to current year.

STAGE: Water years 1998-2001.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-91.

REVISED RECORDS.-- WSP 1175: 1944, 1948. WSP 1508: 1915(M), 1917(M), 1921(M), 1924(M), 1928(M), 1930(M), 1935-37. WDR IL-75-1: Drainage area.

GAGE.-- Water-stage recorder, and U.S. Army Corps of Engineers satellite telemeter and rain gage. Datum of gage is 743.18 ft above sea level. Prior to Jan. 15, 1935, nonrecording gage at site 0.9 mi downstream at datum 4.2 ft lower. July 13, 1943, to Aug. 25, 1982, auxiliary nonrecording gage read once daily 0.9 mi down stream.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 18,400 ft³/s, Mar. 16, 1929, gage height, 19.76 ft, site and datum then in use; minimum, 82 ft³/s, Dec. 11, 1957, result of freezeup.

REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily 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	821	707	694	e490	e600	1670	1390	1290	1380	1190	836	736
2	801	712	684	e490	e600	1390	1380	1260	1490	1170	946	721
3	789	728	668	e490	e600	1370	1360	1280	1600	1150	1080	712
4	842	719	649	e500	e580	1600	1310	1850	1630	1130	1460	705
5	857	706	588	e520	e560	1640	1260	2150	1750	1110	1520	697

6	826	722	411	e520	e570	1480	1290	1940	2050	1110	1260	692
7	794	801	474	e510	e580	1320	1360	1780	2100	1080	1030	697
8	770	862	625	e500	e640	1240	1400	1780	2080	1060	940	830
9	761	912	e620	e530	1550	1170	1430	1780	1950	1050	900	1000
10	754	941	e600	e560	2450	1160	1620	1760	1800	1030	873	1120

11	753	881	e560	e580	2650	1420	2000	1950	1670	1010	833	1120
12	750	827	e500	e580	2550	1690	2320	2120	1600	983	808	1020
13	746	793	e480	e570	2260	1960	2380	2100	1700	957	790	926
14	742	771	e520	e560	1920	2130	2320	1980	1890	936	768	829
15	733	753	e550	e540	1640	2290	2170	1830	2030	920	757	778

16	733	755	e540	e530	1420	2500	1970	1710	2110	903	810	751
17	734	750	e530	e520	1280	2510	1800	1620	2060	891	815	740
18	735	737	e530	e520	1110	2390	1670	1540	1940	897	824	741
19	728	733	e520	e520	1000	2250	1570	1470	1820	921	845	956
20	727	725	e520	e510	924	2120	1510	1400	1730	945	833	1230

21	726	644	e510	e520	918	2070	1520	1640	1660	971	789	2010
22	721	601	e500	e520	856	2050	1620	1880	1580	978	763	1940
23	738	609	e490	e520	798	2040	1750	1910	1520	971	749	1770
24	743	719	e490	e520	836	2010	1710	1830	1500	959	749	1810
25	751	e720	e490	e530	1760	1940	1640	1770	1460	929	773	1920

26	761	e700	e480	e530	2450	1830	1630	1720	1400	903	915	1920
27	764	e700	e480	e520	2400	1700	1590	1680	1340	906	958	1700
28	754	696	e500	e520	2040	1570	1530	1610	1290	887	960	1410
29	739	696	e500	e540	---	1490	1440	1530	1250	863	887	1200
30	725	697	e490	e560	---	1440	1350	1460	1220	848	806	1070

31	714	---	e490	e580	---	1410	---	1390	---	836	762	---

TOTAL	23532	22317	16683	16400	37542	54850	49290	53010	50600	30494	28039	33751
MEAN	759	744	538	529	1341	1769	1643	1710	1687	984	904	1125
MAX	857	941	694	580	2650	2510	2380	2150	2110	1190	1520	2010
MIN	714	601	411	490	560	1160	1260	1260	1220	836	749	692
CFSM	.57	.56	.41	.40	1.01	1.33	1.24	1.29	1.27	.74	.68	.85
IN.	.66	.63	.47	.46	1.05	1.54	1.38	1.49	1.42	.86	.79	.95

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1914 - 2001, BY WATER YEAR (WY)
MEAN	694	747	682	754	1127	1759	1223	1009	1031	910	714	758
MAX	2654	2773	1807	2817	3992	4915	3539	3931	3742	6423	2279	3011
(WY)	1928	1962	1983	1973	1938	1929	1993	1973	2000	1993	1993	1938
MIN	228	258	201	163	282	356	396	232	266	211	233	218
(WY)	1965	1965	1959	1959	1964	1957	1957	1934	1934	1936	1934	1958

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1914 - 2001
ANNUAL TOTAL	410053		416508
ANNUAL MEAN	1120		1141		949
HIGHEST ANNUAL MEAN					2452	1993
LOWEST ANNUAL MEAN					373	1964
HIGHEST DAILY MEAN	7320	Jun 5	2650	Feb 11	17000	Mar 28 1916
LOWEST DAILY MEAN	411 A	Dec 6	411 A	Dec 6	118	Aug 4 1936
ANNUAL SEVEN-DAY MINIMUM	490	Dec 22	490	Dec 22	150	Dec 18 1964
MAXIMUM PEAK FLOW			2690	Feb 11	18400	Mar 16 1929
MAXIMUM PEAK STAGE			11.57	Feb 11	19.76 B	Mar 16 1929
INSTANTANEOUS LOW FLOW			373 A	Dec 6	82 A	Dec 11 1957
ANNUAL RUNOFF (CFSM)	.84		.86		.72
ANNUAL RUNOFF (INCHES)	11.50		11.68		9.73
10 PERCENT EXCEEDS	2020		1950		1790
50 PERCENT EXCEEDS	772		929		665
90 PERCENT EXCEEDS	560		526		315

	A - Result of freezeup.
	B - Site and datum then in use.