05438500 DATA: Discharge Tables, 2004

Station list Available data
ROCK RIVER BASIN


LOCATION.-- Lat 42°15'22", long 88°51'47" (NAD of 1927), in SE1/4SE1/4 sec.27, T.44 N., R.3 E., Boone County, Hydrologic Unit 07090006, on left bank at Belvidere sewage-treatment plant, 1.3 mi downstream from bridge on State Street in Belvidere, 3.0 mi downstream from Piscasaw Creek, and at mile 21.9.

DRAINAGE AREA.-- 538 mi².

PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE
	DISCHARGE: October 1939 to current year.
	STAGE: Water years 1994 to current year.

REVISED RECORDS.-- WSP 1175: 1946. WSP 1508: 1940, 1942-43, 1947(M). WSP 1728: 1940(M). WDR IL-75-1: Drainage area. WDR IL-00: 1999.

GAGE.-- Water-stage recorder, phone telemeter and crest-stage gage. Datum of gage is 738.34 ft above NGVD of 1929 (U.S. Army Corps of Engineers bench mark). Sept. 29, 1939, to Sept. 30, 1942, nonrecording gage at site 1.3 mi upstream at datum 3.99 ft higher, and Oct. 1, 1942, to Sept. 30, 1973, nonrecording gage at present site and datum.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 11,900 ft³/s, Feb. 20, 1994; gage height 14.19 ft; minimum discharge, 14 ft³/s, Sept. 19, 1988, observed.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of Jan. 24, 1938, reached a stage of 16.9 ft, backwater from ice, from information by sewage-treatment plant employees.

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	52	75	134	196	101	339	1120	304	2580	404	155	184
2	52	125	128	194	106	427	911	298	2690	371	152	165
3	57	252	125	195	106	458	758	281	2350	370	175	151
4	61	338	124	194	108	457	642	271	1910	467	247	139
5	61	315	134	174	109	1100	558	258	1490	454	274	135

6	61	306	132	110	111	1520	504	249	1160	406	221	131
7	59	231	129	e100	112	1450	470	239	939	371	190	125
8	57	183	129	e100	112	1270	444	235	787	348	175	120
9	56	158	150	e98	115	935	413	235	667	332	165	116
10	55	147	529	e96	112	696	385	233	795	422	154	113

11	56	141	939	e98	109	560	363	233	1070	456	149	109
12	57	135	837	e100	114	460	343	246	2800	394	146	104
13	59	125	636	e100	111	402	330	310	3060	342	141	102
14	78	116	541	e100	104	385	315	559	2880	311	133	99
15	78	115	423	e100	108	370	300	1060	2320	289	129	108

16	82	113	367	e98	103	346	288	1250	1790	273	127	117
17	74	115	329	e96	108	336	284	1220	1330	265	125	115
18	72	168	293	e92	108	334	277	1540	1080	251	122	107
19	71	317	265	e92	112	329	270	1990	894	238	119	100
20	71	343	187	e94	134	331	276	2010	754	237	113	97

21	69	269	235	e96	158	318	360	1890	807	237	108	93
22	67	220	255	e98	198	299	448	2480	1090	299	103	89
23	68	201	219	107	324	284	405	3070	1140	301	107	88
24	70	188	201	112	483	380	371	3880	961	251	109	87
25	75	172	171	109	452	642	381	3360	794	229	126	86

26	79	163	187	111	375	1010	420	2660	672	213	142	85
27	78	154	198	112	338	1280	389	2210	587	199	164	88
28	77	148	202	107	312	1380	352	1810	543	188	294	85
29	77	142	224	106	300	1550	324	1400	482	175	315	84
30	75	138	225	106	---	1510	302	1440	443	169	260	84

31	76	---	212	104	---	1380	---	2120	---	163	212	---

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2004, BY WATER YEAR (WY)
MEAN	240	284	298	290	410	671	626	506	470	287	217	240
MAX	1242	1328	1613	1053	1221	2337	2461	1610	1835	1815	1287	2215
(WY)	1973	1986	1983	1974	2001	1979	1993	1974	1999	1993	1987	1972
MIN	40.3	50.1	42.8	30.5	49.6	120	141	108	101	56.6	39.2	44.0
(WY)	1957	1957	1964	1940	1940	1956	1963	1949	1977	1941	1964	1964

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1940 - 2004
ANNUAL TOTAL	68868		158921
ANNUAL MEAN	189		434		378
HIGHEST ANNUAL MEAN					992	1993
LOWEST ANNUAL MEAN					112	1963
HIGHEST DAILY MEAN	939	Dec 11	3880	May 24	8860	Jun 14 1999
LOWEST DAILY MEAN	39	Sep 11	52	Oct 1,2	15	A
ANNUAL SEVEN-DAY MINIMUM	43	Sep 6	57	Oct 7	23	Jan 2 1940
MAXIMUM PEAK FLOW			3960	May 24	11900	Feb 20 1994
MAXIMUM PEAK STAGE			8.59	May 24	14.19	Feb 20 1994
INSTANTANEOUS LOW FLOW			50	Oct 1,2,3	14 B	Sep 19 1988
ANNUAL RUNOFF (CFSM)	0.351		0.807		0.702
ANNUAL RUNOFF (INCHES)	4.76		10.99		9.54
10 PERCENT EXCEEDS	369		1150		807
50 PERCENT EXCEEDS	138		220		214
90 PERCENT EXCEEDS	56		86		69

	A - Dec. 30, 1939; Jan. 7, 1940.
	B - Observed.