05448000 DATA: Discharge Tables, 2000

Station list Available data
ROCK RIVER BASIN

05448000 MILL CREEK AT MILAN, IL

LOCATION.-- Lat 41°26'32", long 90°33'21", in NW1/4NE1/4 sec.25, T.17 N., R.2 W., Rock Island County, Hydrologic Unit 07090005, on right bank at upstream side of Knoxville Road Bridge, 1 mi southeast of Milan, and at mile 1.2.

DRAINAGE AREA.-- 62.4 mi².

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

DISCHARGE: March 1989 to current year. October 1939 to September 1940 (fragmentary), July 1941 to September 1986. Seven-month period (March to September), water years 1987-89.

STAGE: Water years 1999-2000.

REVISED RECORDS.-- WSP 1308: 1940(M), 1943(M). WDR IL-72-1: Drainage area.

GAGE.-- Water-stage recorder, phone telemeter and crest-stage gage. Datum of gage is 565.23 ft above sea level (levels by U.S. Army Corps of Engineers). Prior to Oct. 1, 1987, at datum 1.00 ft higher. Prior to Apr. 5, 1940, nonrecording gage at site 300 ft upstream. Oct. 1939 to Nov. 15, 1984, recording gage at site 400 ft. upstream.

REMARKS.-- Occasional pumpage of about 1 ft³/s from quarry into creek upstream from gage.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 9,300 ft³/s, Apr. 22, 1973, gage height, 12.65 ft, present datum; no flow at times in several years.

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

DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES
DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP

1	9.7	6.1	3.0	5.2	e3.5	107	26	74	188	69	27	7.9
2	6.1	5.3	4.0	7.0	e4.0	85	28	66	124	68	24	7.0
3	8.3	7.4	5.3	9.6	e4.7	76	27	61	98	98	20	7.7
4	13	4.2	4.4	9.0	e5.6	70	27	57	85	e611	18	9.2
5	7.8	4.4	14	9.6	e6.5	64	26	50	80	351	22	8.0

6	6.5	4.4	16	6.9	e7.5	58	26	47	68	186	26	7.0
7	4.9	4.0	8.4	7.2	e8.5	56	26	46	62	136	41	5.5
8	4.3	5.1	7.0	4.2	e10	52	29	45	55	110	23	5.5
9	4.3	4.3	9.9	7.3	e12	49	27	89	52	92	24	5.3
10	4.4	4.8	22	13	e14	42	26	100	46	132	20	6.0

11	4.2	3.8	13	14	e15	42	31	75	52	108	17	7.8
12	5.3	5.1	11	8.8	e15	40	26	65	149	86	15	13
13	5.1	4.4	9.2	10	14	40	25	57	172	78	15	7.7
14	4.7	3.9	9.3	5.9	13	39	24	50	234	69	14	20
15	4.2	5.3	9.5	6.4	14	38	23	49	148	63	13	12

16	6.4	4.5	7.1	7.3	14	37	30	47	107	e57	13	6.7
17	7.3	3.6	6.3	13	17	33	67	47	87	e52	11	6.6
18	6.1	3.6	5.4	8.3	24	33	46	68	76	48	10	7.3
19	4.3	3.5	6.7	4.7	27	40	82	73	68	46	9.9	4.9
20	4.4	3.6	6.4	e4.3	27	42	e1150	52	66	42	9.7	9.8

21	4.6	3.6	5.6	e4.1	19	38	540	48	62	39	9.1	13
22	4.4	3.7	3.2	e3.9	42	33	238	47	54	35	11	24
23	4.1	6.3	e4.0	e3.7	205	33	182	43	51	33	9.6	51
24	4.9	6.0	e5.0	e3.6	193	36	156	40	389	32	8.9	35
25	5.3	4.5	e5.5	e3.5	124	33	127	36	298	30	8.3	41

26	4.8	3.7	e6.5	e3.4	487	30	109	37	162	29	6.9	27
27	4.9	3.5	e7.5	e3.3	193	32	98	50	116	28	7.2	20
28	4.0	3.6	e9.0	e3.2	132	32	88	41	102	25	15	16
29	4.3	3.1	7.7	e3.2	106	30	79	38	90	23	14	12
30	5.6	2.7	6.3	e3.3	---	28	74	38	78	28	11	11

31	5.5	---	5.8	e3.4	---	27	---	389	---	34	8.6	---

TOTAL	173.7	132.0	244.0	200.3	1757.3	1395	3463	2025	3419	2838	482.2	414.9
MEAN	5.60	4.40	7.87	6.46	60.6	45.0	115	65.3	114	91.5	15.6	13.8
MAX	13	7.4	22	14	487	107	1150	389	389	611	41	51
MIN	4.0	2.7	3.0	3.2	3.5	27	23	36	46	23	6.9	4.9
CFSM	.09	.07	.13	.10	.97	.72	1.85	1.05	1.83	1.47	.25	.22
IN.	.10	.08	.15	.12	1.05	.83	2.06	1.21	2.04	1.69	.29	.25

e Estimated

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2000, BY WATER YEAR (WY)
MEAN	22.8	24.3	27.0	38.7	61.2	76.4	79.0	72.1	68.6	41.8	25.0	19.2
MAX	209	175	162	223	223	299	335	432	616	388	259	208
(WY)	1955	1962	1983	1960	1959	1960	1965	1996	1993	1986	1993	1970
MIN	.11	.51	.44	.000	2.78	3.95	3.17	3.44	1.86	1.50	.89	.18
(WY)	1957	1957	1977	1940	1964	1956	1956	1956	1956	1988	1957	1956

SUMMARY STATISTICS	FOR 1999 CALENDAR YEAR		FOR 2000 WATER YEAR		WATER YEARS 1940 - 2000
ANNUAL TOTAL	21279.4		16544.4
ANNUAL MEAN	58.3		45.2		47.7
HIGHEST ANNUAL MEAN					173	1993
LOWEST ANNUAL MEAN					8.67	1957
HIGHEST DAILY MEAN	609	Apr 16	1150 A	Apr 20	5000	Jul 8 1986
LOWEST DAILY MEAN	1.9	Sep 22, 25	2.7	Nov 30	.00	B
ANNUAL SEVEN-DAY MINIMUM	2.2	Sep 17	3.3	Jan 25	.00	Dec 30 1939
INSTANTANEOUS PEAK FLOW			2430	Apr 20	9300	Apr 22 1973
INSTANTANEOUS PEAK STAGE			7.05	Apr 20	12.65 C	Apr 22 1973
INSTANTANEOUS LOW FLOW			1.2	Nov 30
ANNUAL RUNOFF (CFSM)	.93		.72		.77
ANNUAL RUNOFF (INCHES)	12.69		9.86		10.40
10 PERCENT EXCEEDS	150		99		92
50 PERCENT EXCEEDS	41		18		17
90 PERCENT EXCEEDS	3.7		4.2		1.6

A - Estimated on basis of graphic reconstruction.
B - At times in several years.
C - Present datum.