MISSOURI RIVER MAIN STEM

06338490 MISSOURI RIVER AT GARRISON DAM, ND

LOCATION.--Lat 47×30'08", long 101×25'50", in S12 sec.31, T.147 N., R.84 W., Mercer County, Hydrologic Unit 10130101, in control structure of Garrison Dam, 2.5 mi west of Riverdale, 14 mi upstream from Knife River, and at mile 1,389.9.

DRAINAGE AREA.--181,400 mi2, approximately.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1969 to current year.

GAGE.--Flow meter and gate readings.

REMARKS.--Records good. Many diversions above station. Flow regulated by Garrison Dam. Prior to October 1969 records were obtained at a site 9.1 mi downstream. Discharges at the downstream site were generally about 7 percent greater than those furnished by the U.S. Army Corps of Engineers for the present site.

COOPERATION.--Records furnished by the U.S. Army Corps of Engineers.

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	13,900	10,800	12,700	16,900	22,300	22,800	14,200	13,700	19,000	17,900	18,000	16,700
2	12,100	10,600	12,700	17,200	21,900	22,900	14,000	13,700	17,600	17,700	18,100	17,200
3	12,300	10,500	12,900	17,300	21,600	22,200	13,600	13,600	17,900	17,600	18,300	17,200
4	10,600	10,800	13,100	17,200	21,800	21,900	14,250	13,900	18,200	17,800	17,100	17,300
5	10,400	10,800	13,100	17,200	22,000	21,400	16,000	14,100	18,200	18,000	17,000	17,000
6	10,400	10,800	13,000	17,800	21,600	21,100	15,900	14,200	18,400	17,900	17,200	17,300
7	10,500	10,900	13,000	18,100	23,900	20,100	15,600	14,300	18,200	17,900	17,300	17,300
8	10,700	10,900	14,400	17,800	22,900	20,300	16,000	14,300	18,300	17,600	17,100	17,200
9	10,300	10,900	14,300	17,900	22,200	19,200	15,900	14,200	18,100	17,900	16,900	17,000
10	10,400	10,800	15,100	17,300	22,900	19,000	16,400	14,200	18,200	17,900	17,000	17,000
11	10,500	10,700	15,100	17,700	22,500	18,000	15,900	14,300	18,400	17,700	17,000	17,100
12	10,400	10,700	16,100	17,600	22,700	17,900	15,900	13,800	18,000	17,900	17,200	17,000
13	10,300	10,700	16,000	18,400	22,400	17,100	17,200	13,800	18,100	17,800	17,400	16,700
14	11,200	10,900	16,000	18,800	23,500	15,900	18,500	15,200	17,200	18,100	17,300	17,100
15	11,200	10,800	15,700	18,800	23,700	14,700	18,100	18,800	17,800	18,000	17,000	16,700
16	11,200	11,100	16,700	19,300	23,800	13,500	19,500	15,900	17,900	17,900	17,200	16,400
17	11,200	13,100	16,800	19,700	23,400	13,700	19,500	15,600	17,800	17,900	17,200	16,900
18	11,300	12,900	16,700	20,300	23,600	14,200	19,200	18,900	17,800	17,800	17,300	13,900
19	10,800	12,700	17,800	20,100	23,800	13,900	19,000	15,700	17,900	17,900	17,000	13,900
20	10,400	12,600	17,900	20,000	23,500	13,800	18,900	15,900	17,700	18,000	17,000	13,800
21	10,400	12,800	18,000	20,400	23,900	14,100	19,500	19,200	18,100	18,100	17,100	13,800
22	10,100	12,400	18,000	20,200	24,000	14,000	19,700	16,000	17,900	18,100	17,100	11,800
23	10,600	12,600	18,100	20,500	24,000	13,600	20,500	15,900	17,800	17,900	17,400	11,800
24	10,200	12,500	18,100	20,100	23,800	13,800	20,100	19,100	17,900	18,100	17,100	11,700
25	10,300	12,800	18,400	20,300	24,100	14,200	20,300	16,100	17,900	18,200	17,000	11,700
26	10,300	13,600	17,400	20,800	23,900	13,900	18,300	15,900	17,800	18,000	17,100	11,900
27	10,100	13,100	17,400	21,100	24,000	14,000	14,200	19,100	17,800	18,100	17,300	12,000
28	10,600	13,200	17,200	21,200	24,000	13,800	14,000	16,000	18,100	18,000	17,000	11,800
29	10,600	12,700	17,200	21,600	22,800	13,600	14,400	15,800	17,900	18,100	17,100	11,900
30	10,500	12,700	17,300	22,000	---	13,500	13,900	18,600	17,900	18,000	17,200	11,400
31	10,500	---	17,300	22,000	---	14,300	---	18,700	---	18,100	17,000	---
TOTAL	334,300	352,400	493,500	595,600	670,500	516,400	508,450	488,500	539,800	555,900	534,000	450,500
MEAN	10,780	11,750	15,920	19,210	23,120	16,660	16,950	15,760	17,990	17,930	17,230	15,020
MAX	13,900	13,600	18,400	22,000	24,100	22,900	20,500	19,200	19,000	18,200	18,300	17,300
MIN	10,100	10,500	12,700	16,900	21,600	13,500	13,600	13,600	17,200	17,600	16,900	11,400
AC-FT	663,100	699,000	978,900	1,181,000	1,330,000	1,024,000	1,009,000	968,900	1,071,000	1,103,000	1,059,000	893,600
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1970 - 2004, BY WATER YEAR (WY)
MEAN	19,240	20,500	20,660	23,270	24,600	19,820	19,280	21,740	23,890	25,140	24,530	20,810
MAX	49,450	42,350	29,530	30,500	31,500	28,210	37,500	38,490	42,430	61,800	54,130	46,570
(WY)	(1998)	(1998)	(1970)	(1979)	(1976)	(1983)	(1972)	(1972)	(1997)	(1975)	(1975)	(1997)
MIN	9,945	10,110	12,900	13,070	13,230	10,370	10,280	10,560	11,080	13,220	13,960	10,990
(WY)	(1994)	(1993)	(2002)	(2002)	(2002)	(1993)	(1993)	(1986)	(1995)	(1995)	(2001)	(1990)

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR	FOR 2004 WATER YEAR	WATER YEARS 1970 - 2004
ANNUAL TOTAL	6,515,310	6,039,850
ANNUAL MEAN	17,850	16,500	21,950
HIGHEST ANNUAL MEAN			33,000 1975
LOWEST ANNUAL MEAN			13,710 1993
HIGHEST DAILY MEAN	23,500 Feb 24	24,100 Feb 25	65,200 Jul 25, 1975
LOWEST DAILY MEAN	10,100 Oct 22	10,100 Oct 22	4,100 Mar 25, 1997
ANNUAL SEVEN-DAY MINIMUM	10,300 Oct 21	10,300 Oct 21	7,960 Mar 22, 1997
ANNUAL RUNOFF (AC-FT)	12,920,000	11,980,000	15,900,000
10 PERCENT EXCEEDS	21,500	21,500	31,400
50 PERCENT EXCEEDS	19,000	17,200	20,400
90 PERCENT EXCEEDS	10,900	10,900	12,800

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