05474500 DATA: Discharge Tables, 2004

Station list Available data
UPPER MISSISSIPPI RIVER BASIN

05474500 MISSISSIPPI RIVER AT KEOKUK, IA


LOCATION.-- Lat 40°23'37", long 91°22'27" (NAD of 1927), 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 NGVD of 1929 (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 NGVD of 1929.

REMARKS.-- Discharge computed from records of operation of turbines in powerplant and spillway gates in dam. 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.

COOPERATION.--Records provided by Ameren-Union Electric Co.

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, 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	17100	20900	33800	42600	22900	55500	118800	86700	252300	146700	46600	49600
2	22800	23900	33400	40100	22900	61800	119300	88100	261300	134500	48200	44900
3	21900	33800	31400	35000	24900	68400	125700	86300	262000	125800	44600	41600
4	20100	40100	29700	35000	25500	79200	123900	81600	257500	110800	49800	37500
5	15800	43600	29700	34300	25000	104400	124700	79100	246100	92700	51300	35700

6	17600	50800	29000	21100	27500	114100	130900	69400	236300	89300	54200	32400
7	24500	54800	30300	16800	27100	128100	130200	67900	226000	90100	58900	32500
8	23300	52000	32800	18200	27800	137600	131600	63700	215800	87500	61300	34000
9	22000	41500	35500	20500	27600	130900	134600	60900	204300	91000	54700	36500
10	21100	39400	65000	22200	27500	107500	134800	55200	200300	97900	48400	35500

11	20900	38700	61300	23900	27800	103500	129200	53700	191100	102900	46700	35000
12	21700	38100	59400	30500	28500	98600	123600	56100	192800	108700	46300	36200
13	21900	32300	44200	36100	28700	84600	112400	65200	192400	109300	44800	37100
14	23600	30300	37700	33900	28600	75400	95100	71400	191100	110400	44400	36300
15	23100	26500	36500	30100	28300	68800	84600	70800	193900	110600	43600	41000

16	29900	32200	33300	29400	28400	74600	79300	72100	196000	106100	43300	39900
17	32800	33500	31000	32500	27400	71500	78500	68500	201400	100600	40400	41400
18	22500	37200	29800	32000	26000	75000	69400	74700	201000	93600	41300	56600
19	16700	38100	30300	25000	28600	74900	70200	88000	201100	92400	42300	56500
20	18400	35400	33800	24000	30600	82600	65700	97100	207000	89800	45600	54400

21	20300	37600	33400	26800	34100	79400	66000	98100	214600	84100	46200	61000
22	22400	38300	34700	24300	40500	74700	71100	98000	217300	84900	40400	73400
23	23200	37200	37900	23400	44500	70900	76200	99600	217900	83700	35500	74700
24	24000	34300	38100	23700	53400	68100	75600	122300	221500	81500	37400	80300
25	24300	33000	37900	24300	65300	73100	73000	153900	218200	78300	37700	79100

26	25600	40100	36700	25700	62200	82200	78200	177100	211900	69600	38900	75800
27	25300	39300	36500	22700	63000	97900	87200	190400	204600	57800	48200	72400
28	22600	37900	36700	21200	57800	109000	82900	202300	192700	55500	53300	68800
29	21300	37000	36900	22000	52400	103900	82400	206700	177200	51300	54100	64800
30	20400	33700	38400	23000	---	108100	88800	212100	161900	45700	58100	60900

31	20800	---	42700	22800	---	112700	---	230000	---	41200	56200	---

TOTAL	687900	1111500	1157800	843100	1014800	2777000	2963900	3247000	6367500	2824300	1462700	1525800
MEAN	22190	37050	37350	27200	34990	89580	98800	104700	212200	91110	47180	50860
MAX	32800	54800	65000	42600	65300	138000	135000	230000	262000	147000	61300	80300
MIN	15800	20900	29000	16800	22900	55500	65700	53700	162000	41200	35500	32400
AC-FT	1364000	2205000	2296000	1672000	2013000	5508000	5879000	6440000	12630000	5602000	2901000	3026000
CFSM	0.19	0.31	0.31	0.23	0.29	0.75	0.83	0.88	1.78	0.77	0.40	0.43
IN.	0.22	0.35	0.36	0.26	0.32	0.87	0.93	1.02	1.99	0.88	0.46	0.48

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1879 - 2004, BY WATER YEAR (WY)
MEAN	50900	51100	38710	36030	42740	80390	119600	109600	95450	75210	49780	47390
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 2003 CALENDAR YEAR		FOR 2004 WATER YEAR		WATER YEARS 1879 - 2004
ANNUAL TOTAL	19713400		25983300
ANNUAL MEAN	54010		70990		66460
HIGHEST ANNUAL MEAN					162500	1993
LOWEST ANNUAL MEAN					21540	1934
HIGHEST DAILY MEAN	181000	May 25	262000	Jun 3	434000	Jul 10 1993
LOWEST DAILY MEAN	13500	Sep 10	15800	Oct 5	5000	Dec 27 1933
ANNUAL SEVEN-DAY MINIMUM	15500	Sep 6	20000	Oct 1	8270	Dec 25 1933
MAXIMUM PEAK FLOW					446000	Jul 10 1993
MAXIMUM PEAK STAGE					27.58 A	Jul 10 1993
ANNUAL RUNOFF (AC-FT)	39100000		51540000		48150000
ANNUAL RUNOFF (CFSM)	0.454		0.597		0.558
ANNUAL RUNOFF (INCHES)	6.16		8.12		7.59
10 PERCENT EXCEEDS	116000		156000		134000
50 PERCENT EXCEEDS	36900		51300		51000
90 PERCENT EXCEEDS	21800		23400		23000

A - From floodmark.