05547350 DATA: Discharge Tables, 1999

Station list Available data
ILLINOIS RIVER BASIN

05547350 GRASS LAKE OUTLET AT LOTUS WOODS, IL

LOCATION.--Lat 42°25'33", long 88°09'53", in SW1/4SW1/4 sec.34, T.46 N., R.9 E., Lake County, Hydrologic Unit 07120006, on right bank at downstream side of bridge on Grass Lake Road in Lotus Woods, 10.8 mi upstream from Stratton Lock and Dam, and at river mile 108.5.

DRAINAGE AREA.--919 mi².

PERIOD OF RECORD.--December 1974 to July 1975 (discharge measurements only). December 1997 to May 1999 (discontinued).

GAGE.--Water-stage recorder and acoustical-velocity meter. Datum of gage is 733.00 ft above sea level (levels by Illinois Department of Transportation).

REMARKS.--Records poor. Stage regulated by Stratton Lock and Dam, 5.5 mi downstream from station (previously known as McHenry Dam). Gage-height telemeter at station.

EXTREMES FOR PERIOD OF RECORD.--Maximum gage height 5.58 ft, April 28, 1999, discharge not determined.

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	e260	e410	e480	e370	e1800	e740	e490	e2000	---	---	---	---
2	e265	e470	e550	e450	e1600	e770	e500	e1700	---	---	---	---
3	e290	e430	e540	e480	e1500	e770	e520	e1550	---	---	---	---
4	e370	e310	e560	e480	e1550	e730	e520	e1400	---	---	---	---
5	e380	e370	e600	e460	e1550	e700	e500	e1260	---	---	---	---

6	e500	e380	e620	e500	e1500	e740	e530	e1200	---	---	---	---
7	e720	e380	e680	e480	e1400	e750	e510	e1120	---	---	---	---
8	e700	e390	e800	e490	e1300	e730	e490	e1070	---	---	---	---
9	e690	e360	e740	e480	e1200	e680	e730	e1080	---	---	---	---
10	e680	e380	e740	e470	e1200	e580	e1000	e1050	---	---	---	---

11	e600	e850	e680	e490	e1250	e520	e1150	e980	---	---	---	---
12	e560	e1400	e620	e520	e1380	e660	e1130	e1000	---	---	---	---
13	e500	e1340	e580	e510	e1500	e740	e1060	e1080	---	---	---	---
14	e440	e1150	e560	e500	e1380	e720	e1000	e1100	---	---	---	---
15	e380	e970	e540	e520	e1300	e630	e940	e1050	---	---	---	---

16	e320	e970	e500	e530	e1220	e580	e920	e1000	---	---	---	---
17	e340	e860	e510	e550	e1250	e640	e970	e1300	---	---	---	---
18	e640	e770	e520	e610	e1230	e860	e900	e1650	---	---	---	---
19	e870	e670	e480	e660	e1200	e1150	e810	e1800	---	---	---	---
20	e820	e580	e460	e660	e1100	e940	e700	e1800	---	---	---	---

21	e740	e520	e470	e670	e1020	e800	e720	e1700	---	---	---	---
22	e620	e510	e350	e720	e950	e720	e800	e1600	---	---	---	---
23	e540	e480	e370	e1100	e900	e760	e1100	e1550	---	---	---	---
24	e510	e490	e420	e1350	e820	e730	e1600	e1520	---	---	---	---
25	e510	e540	e400	e1500	e750	e700	e2500	e1470	---	---	---	---

26	e500	e500	e430	e1750	e730	e660	e2450	e1350	---	---	---	---
27	e480	e470	e490	e1770	e710	e620	e2400	e1280	---	---	---	---
28	e420	e460	e480	e1800	e700	e560	e2350	e1150	---	---	---	---
29	e440	e470	e440	e1900	---	e450	e2250	e1050	---	---	---	---
30	e420	e500	e300	e1850	---	e490	e2150	e860	---	---	---	---

31	e380	---	e380	e1800	---	e500	---	e800	---	---	---	---

TOTAL	15885	18380	16290	26420	33990	21620	33690	40520	---	---	---	---
MEAN	512	613	525	852	1214	697	1123	1307	---	---	---	---
MAX	870	1400	800	1900	1800	1150	2500	2000	---	---	---	---
MIN	260	310	300	370	700	450	490	800	---	---	---	---
CFSM	.56	.67	.57	.93	1.32	.76	1.22	1.42	---	---	---	---
IN.	.64	.74	.66	1.07	1.38	.88	1.36	1.64	---	---	---	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1998 - 1999, BY WATER YEAR (WY)
MEAN	512	613	523	769	1158	807	1207	1063	566	462	615	318
MAX	512	613	525	852	1214	916	1290	1307	566	462	615	318
(WY)	1999	1999	1999	1999	1999	1998	1998	1999	1998	1998	1998	1998
MIN	512	613	521	686	1102	697	1123	818	566	462	615	318
(WY)	1999	1999	1998	1998	1998	1999	1999	1998	1998	1998	1998	1998

SUMMARY STATISTICS	FOR 1998 CALENDAR YEAR		WATER YEARS 1998 - 1999
ANNUAL TOTAL	255075
ANNUAL MEAN	699
HIGHEST DAILY MEAN	1600 A	Apr 10,11	2500 A	Apr 25 1999
LOWEST DAILY MEAN	230 A	Aug 3	230 A	Aug 3 1998
ANNUAL SEVEN-DAY MINIMUM	244 A	Jul 28	244 A	Jul 28 1998
ANNUAL RUNOFF (CFSM)	.76
ANNUAL RUNOFF (INCHES)	10.33
10 PERCENT EXCEEDS	1230		1370
50 PERCENT EXCEEDS	610		660
90 PERCENT EXCEEDS	320		360

A - Estimated.