05474500 DATA: Discharge Tables, 2001

Station list Available data
UPPER MISSISSIPPI RIVER BASIN

05474500 MISSISSIPPI RIVER AT KEOKUK, IA

(National Stream-Quality Accounting Network Station)

LOCATION.-- Lat 40°23'37", long 91°22'27", in SE1/4 SW1/4 sec.30, T.65 N., R.4 W., Lee County, Hydrologic Unit 07080104, near right bank in tailwater of dam and powerplant of Union Electric Co. at Keokuk, 0.2 mi upstream from bridge on U.S. Highway 136, 2.7 mi upstream from Des Moines River, and at mile 364.2 upstream from Ohio River.

DRAINAGE AREA.-- 119,000 mi², approximately.

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

DISCHARGE: January 1878 to current year.

GAGE.-- Water-stage recorder. Datum of gage is 477.41 ft above sea level (levels by U.S. Army Corps of Engineers). Jan. 1, 1878 to May 1913, nonrecording gage at Galland (formerly Nashville), 8 mi upstream; zero of gage was set to low-water mark of 1864, or 496.52 ft above sea level.

REMARKS.-- Discharge computed from records of operation of turbines in powerplant and spillway gates in dam. Records provided by Union Electric Co. Minor flow regulation caused by powerplant since 1913 and navigation dams. Records for May 1913 to September 1937 adjusted for change in contents in Keokuk Reservoir, those after September 1937 unadjusted.

EXTREMES FOR PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 446,000 ft³/s, July 10, 1993, gage height, 27.58 ft; from floodmark; minimum daily discharge, 5,000 ft³/s, December 27, 1933.

EXTREMES OUTSIDE PERIOD OF RECORD.--
SURFACE-WATER DISCHARGE AND STAGE: Flood of June 6, 1851, reached a stage of 21.0 ft, present site and datum, estimated as 13.5 ft at Galland, discharge, 360,000 ft³/s.

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	35500	33300	43800	33900	54400	116500	100200	280300	167500	154700	57000	35300
2	34200	32400	52800	34200	52800	91100	102500	276100	173400	154500	54600	35100
3	35700	34700	50900	35900	46100	80500	104600	268300	176200	153700	54900	34400
4	40500	39400	48200	38200	46900	77000	106400	271100	178500	152400	52200	30600
5	36300	41500	43800	38100	47000	79700	104300	278200	181000	150300	56400	35400

6	39100	43400	35900	38100	42700	76500	111500	278700	187300	145100	66600	39600
7	35600	45300	31900	34900	44300	73500	114100	286300	186800	135500	63800	37500
8	33700	47300	29900	38300	46400	67300	132400	289800	184300	126700	65400	36500
9	29700	49700	28300	36900	78000	62900	131200	291400	181600	121900	66400	38700
10	31100	52100	25400	35700	107800	58600	141500	292600	176300	112900	67400	41800

11	25400	61000	27000	37200	115400	60800	150400	302400	170500	109400	63000	52500
12	27000	59600	18300	38400	112300	63500	153300	319500	163400	90400	63300	55100
13	29000	53800	16900	37600	109300	68300	165200	324800	155200	83200	50500	61800
14	33400	59700	25100	39600	92200	85500	172700	333800	148900	65500	38300	58800
15	37100	56400	31800	39200	85300	102500	186800	344800	150000	60800	28600	56800

16	37700	58600	28200	38500	78300	127000	198500	333900	156500	55900	32400	50500
17	37400	62600	28400	39300	67000	127500	209400	313300	152900	50800	35800	44700
18	34300	64200	28500	40900	59000	134200	215400	294500	149200	51900	42300	40300
19	28500	61700	30000	42000	60500	134100	228400	273800	148300	55100	42700	42200
20	22800	65400	32300	41100	62000	126100	242200	255100	145000	57800	39800	43900

21	24800	59700	34200	41300	55100	114900	256200	241700	152500	53400	39200	54100
22	32500	54500	34200	42200	51700	120300	262900	229400	155900	53400	38700	57300
23	38400	45500	34500	42100	48500	120100	282000	215600	158800	55300	48300	56300
24	34900	49800	33200	39700	56100	120100	299100	205100	159400	58900	42100	53800
25	34900	48800	33500	38100	99500	122300	303100	191800	159700	58800	44200	50500

26	34200	45700	32000	33900	132800	123400	303000	183700	160400	61600	43500	52600
27	34500	48300	32600	33900	146500	121200	302200	179900	157800	57700	42100	54000
28	36600	47800	32800	34500	131300	114700	297400	176300	156800	56300	41900	52800
29	39600	48900	34200	35000	---	111000	291800	170400	154800	60600	41700	54800
30	39800	46900	34300	41200	---	105600	286700	163700	155300	59200	43900	46500

31	33100	---	33400	47700	---	102900	---	162000	---	60700	39700	---

TOTAL	1047300	1518000	1026300	1187600	2129200	3089600	5955400	8028300	4904200	2724400	1506700	1404200
MEAN	33780	50600	33110	38310	76040	99660	198500	259000	163500	87880	48600	46810
MAX	40500	65400	52800	47700	146000	134000	303000	345000	187000	155000	67400	61800
MIN	22800	32400	16900	33900	42700	58600	100000	162000	145000	50800	28600	30600
AC-FT	2077000	3011000	2036000	2356000	4223000	6128000	11810000	15920000	9727000	5404000	2989000	2785000
CFSM	.28	.43	.28	.32	.64	.84	1.67	2.18	1.37	.74	.41	.39
IN.	.33	.47	.32	.37	.67	.97	1.86	2.51	1.53	.85	.47	.44

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1879 - 2001, BY WATER YEAR (WY)
MEAN	50890	51200	38560	36080	42860	80700	120200	109000	94320	74870	49740	47400
MAX	221100	211300	125600	101600	95620	185400	250100	260700	227300	385800	223000	163300
(WY)	1882	1882	1983	1973	1984	1973	1993	1888	1892	1993	1993	1993
MIN	16060	16020	13450	14650	15790	21780	32930	27600	17400	16280	13030	15530
(WY)	1934	1934	1934	1940	1899	1934	1895	1934	1934	1988	1936	1976

SUMMARY STATISTICS	FOR 2000 CALENDAR YEAR		FOR 2001 WATER YEAR		WATER YEARS 1879 - 2001
ANNUAL TOTAL	23855200		34521200
ANNUAL MEAN	65180		94580		66370
HIGHEST ANNUAL MEAN					162500	1993
LOWEST ANNUAL MEAN					21540	1934
HIGHEST DAILY MEAN	209000	Jun 18	345000	May 15	434000	Jul 10 1993
LOWEST DAILY MEAN	16900	Dec 13	16900	Dec 13	5000	Dec 27 1933
ANNUAL SEVEN-DAY MINIMUM	24400	Dec 8	24400	Dec 8	8270	Dec 25 1933
MAXIMUM PEAK FLOW					446000	Jul 10 1993
MAXIMUM PEAK STAGE					27.58	Jul 10 1993a
ANNUAL RUNOFF (AC-FT)	47320000		68470000		48080000
ANNUAL RUNOFF (CFSM)	.55		.79		.56
ANNUAL RUNOFF (INCHES)	7.46		10.79		7.58
10 PERCENT EXCEEDS	145000		212000		134000
50 PERCENT EXCEEDS	49900		56400		50800
90 PERCENT EXCEEDS	31400		33600		23000

a From floodmark.