05435500 DATA: Discharge Tables, 1999

Station list Available data
ROCK RIVER BASIN

05435500 PECATONICA RIVER AT FREEPORT, IL

LOCATION.--Lat 42°18'13", long 89°36'57", 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.--September 1914 to current year.

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. 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 downstream.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Gage height telemeter at station.

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	889	921	768	e700	1300	1080	878	4040	1920	1530	1340	895
2	887	895	762	e700	1460	1070	875	3790	2170	1540	1540	876
3	915	866	755	e720	1790	1050	881	3460	2220	1590	1590	866
4	936	838	740	e740	1860	1000	963	3110	2270	1610	1450	848
5	1010	816	730	e750	1820	975	1150	2760	2370	1550	1300	832

6	1230	803	746	e760	1670	951	1350	2500	2390	1500	1220	813
7	1500	788	876	e760	1480	916	1360	2330	2500	1430	1180	797
8	1500	775	911	e750	1320	902	1320	2220	2460	1370	1160	785
9	1370	768	891	e740	1260	863	1590	2120	2340	1340	1150	775
10	1230	981	867	e720	1270	868	2000	2030	2300	1310	1140	779

11	1130	1390	848	e700	1410	886	2160	1920	2480	1310	1130	777
12	1070	1440	836	e680	1770	952	2210	1850	2610	1280	1130	764
13	1020	1470	827	e670	1910	941	2160	1870	2920	1240	1150	756
14	990	1350	819	e660	1980	904	2000	1850	3060	1210	1150	747
15	979	1190	813	e650	1870	892	1820	1780	3060	1180	1130	744

16	963	1090	808	e640	1670	921	1790	1710	2900	1160	1090	743
17	1030	1030	806	e630	1520	1030	1820	1830	2650	1290	1050	737
18	1660	983	804	e630	1410	1180	1710	2390	2370	1530	1030	727
19	1950	948	803	e620	1310	1260	1590	2890	2140	1540	1030	726
20	1860	916	801	e620	1230	1250	1500	3840	1970	1550	1040	726

21	1630	886	808	e620	1150	1160	1450	5010	1850	1570	1040	715
22	1390	862	657	e700	1090	1080	1620	5520	1790	1670	1030	710
23	1220	848	564	e1000	1050	1030	2400	5340	1920	1740	1030	707
24	1110	828	662	e1500	1030	1000	2920	4800	2020	1980	1140	704
25	1040	815	872	1980	1020	968	3110	4230	1930	1930	1250	699

26	976	804	938	1930	1010	940	3230	3700	1800	1690	1270	696
27	947	788	882	1680	1040	919	3530	3220	1700	1550	1170	724
28	967	776	818	1550	1070	904	4030	2820	1620	1490	1070	888
29	967	769	780	1480	---	902	4290	2470	1570	1480	1010	1010
30	966	769	e750	1440	---	892	4250	2200	1520	1410	955	1000

31	951	---	e720	1350	---	882	---	2020	---	1330	916	---

TOTAL	36283	28403	24662	29070	39770	30568	61957	91620	66820	45900	35881	23566
MEAN	1170	947	796	938	1420	986	2065	2955	2227	1481	1157	786
MAX	1950	1470	938	1980	1980	1260	4290	5520	3060	1980	1590	1010
MIN	887	768	564	620	1010	863	875	1710	1520	1160	916	696
CFSM	.88	.71	.60	.71	1.07	.74	1.56	2.23	1.68	1.12	.87	.59
IN.	1.02	.80	.69	.82	1.12	.86	1.74	2.57	1.87	1.29	1.01	.66

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1914 - 1999, BY WATER YEAR (WY)
MEAN	692	747	684	758	1126	1770	1223	1000	991	903	709	751
MAX	2654	2773	1807	2817	3992	4915	3539	3931	3172	6423	2279	3011
(WY)	1928	1962	1983	1973	1938	1929	1993	1973	1993	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 1998 CALENDAR YEAR		FOR 1999 WATER YEAR		WATER YEARS 1914 - 1999
ANNUAL TOTAL	482502		514500
ANNUAL MEAN	1322		1410		945
HIGHEST ANNUAL MEAN					2452	1993
LOWEST ANNUAL MEAN					373	1964
HIGHEST DAILY MEAN	4150	Apr 6	5520	May 22	17000	Mar 28 1916
LOWEST DAILY MEAN	540 A	Jan 25-28	564	Dec 23	118	Aug 4 1936
ANNUAL SEVEN-DAY MINIMUM	544	Jan 22	630	Jan 15	150	Dec 18 1964
INSTANTANEOUS PEAK FLOW			5550	May 22	18400	Mar 16 1929
INSTANTANEOUS PEAK STAGE			13.96	May 22	19.76 B	Mar 16 1929
INSTANTANEOUS LOW FLOW			541	C	82 A	Dec 11 1957
ANNUAL RUNOFF (CFSM)	1.00		1.06		.71
ANNUAL RUNOFF (INCHES)	13.54		14.43		9.68
10 PERCENT EXCEEDS	2430		2380		1770
50 PERCENT EXCEEDS	1080		1140		658
90 PERCENT EXCEEDS	702		744		313

A - Estimated due to backwater from ice.
B - Site and datum then in use.
C - Dec. 22, 23; result of freezeup.