LITTLE MISSOURI RIVER BASIN

06336000 LITTLE MISSOURI RIVER AT MEDORA, ND

LOCATION.--Lat 46×55'10", long 103×31'40", in NE14 sec.27, T.140 N., R.102 W., Billings County, Hydrologic Unit 10110203, on left bank 50 ft upstream from bridge on county highway and 1 mi upstream from Andrews Creek and bridge on I-94.

DRAINAGE AREA.--6,190 mi2, approximately.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--May 1903 to October 1908, October to November 1921, April, May, and December 1922, May 1923 to September 1924, October 1928 to September 1934, October 1945 to September 1975, March 2001 to current year. Monthly discharge only for some periods, published in WSP 1309.

GAGE.--Water-stage recorder on upstream side of highway bridge. Datum of gage is 2,246.75 ft above National Geodetic Vertical Datum of 1929. Prior to Oct. 9, 1945, nonrecording gages at several sites within 0.2 mi upstream from present site at various datums. Oct. 9, 1945, to Aug. 22, 1951, nonrecording gage at current location at current datum. Sept. 1951 to Sept. 1975 recording gage 600 ft downstream at current datum.

REMARKS.--Records fair except for estimated daily discharges, which are poor.

REVISIONS (WATER YEARS).--WSP 546: Drainage area. WSP 1279: 1903-7, 1923-24, 1930-31, 1934(M).

CORRECTION.--When the gage was re-established in March 2001, the base gage was incorrectly set 0.84 ft too low. All gage heights since Oct. 1, 2002, and the 2001 peak stage have been corrected. Unit values and daily values data for water years 2001-02 have not been adjusted. Discharge data for those years are unaffected by this correction.

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	7.2	e18	e16	e10	e2.4	e302	301	33	117	e5.6	e12	16
2	6.8	e19	e17	e9.8	e2.4	e241	215	31	156	e5.1	e12	15
3	5.1	e19	e17	e9.2	e2.4	e230	170	30	119	e5.1	e12	14
4	5.0	e19	e16	e8.3	e2.4	e236	141	29	94	e5.4	e11	15
5	5.2	e20	e16	e7.4	e2.4	e307	122	28	73	12	13	16
6	5.9	e20	e16	e6.2	e2.4	e369	109	26	54	35	34	13
7	7.0	e21	e15	e5.3	e2.4	e435	97	26	41	130	820	11
8	9.0	e22	e14	e4.1	e2.4	e563	93	24	33	304	1,000	12
9	12	e23	e14	e3.4	e2.3	e1,370	84	18	37	211	790	13
10	14	e24	e14	e3.3	e2.3	e5,050	78	14	38	185	607	14
11	15	e25	e14	e3.4	e2.2	e4,160	74	18	68	162	977	15
12	16	e27	e14	e3.6	e2.1	e2,650	68	21	55	76	654	16
13	19	e29	e14	e4.0	e2.1	1,600	62	18	48	47	394	21
14	21	e31	e14	e4.2	e2.1	1,370	59	21	42	35	231	21
15	21	e33	e14	e4.2	e2.0	1,520	55	21	34	114	144	28
16	22	e34	e14	e3.9	e2.1	1,120	51	18	42	198	104	37
17	22	e34	e15	e3.8	e2.5	892	47	18	43	126	85	261
18	e20	e34	e14	e3.6	e3.3	845	52	20	36	88	70	156
19	e17	e32	e15	e3.4	e4.4	734	72	23	28	57	53	163
20	e13	e31	e14	e3.3	e6.5	686	74	22	19	e49	47	118
21	e14	e24	e15	e3.3	e9.8	620	87	23	12	e38	42	75
22	e15	e19	e14	e3.2	e20	542	76	26	8.8	e33	38	49
23	e13	e17	e14	e3.2	e60	438	57	37	e7.8	e29	36	40
24	e11	e15	e14	e3.1	e200	349	49	60	e7.0	e25	32	33
25	e12	e15	e14	e3.0	e294	297	51	75	e6.6	e21	30	29
26	e14	e15	e14	e2.9	e410	261	49	194	e6.4	e20	27	25
27	e13	e15	e14	e2.8	e466	278	47	166	e6.6	e18	24	23
28	e13	e15	e13	e2.6	e442	755	43	133	7.0	e16	28	21
29	e14	e15	e13	e2.6	e389	947	41	119	e6.8	e15	28	20
30	e15	e15	e12	e2.5	---	617	37	87	e6.3	e14	23	19
31	e16	---	e11	e2.5	---	467	---	63	---	e13	19	---
TOTAL	413.2	680	445	136.1	2,343.9	30,251	2,561	1,442	1,252.3	2,092.2	6,397	1,309
MEAN	13.3	22.7	14.4	4.39	80.8	976	85.4	46.5	41.7	67.5	206	43.6
MAX	22	34	17	10	466	5,050	301	194	156	304	1,000	261
MIN	5.0	15	11	2.5	2.0	230	37	14	6.3	5.1	11	11
AC-FT	820	1,350	883	270	4,650	60,000	5,080	2,860	2,480	4,150	12,690	2,600
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1903 - 2004, BY WATER YEAR (WY)
MEAN	152	48.7	20.3	15.0	155	1,231	1,220	747	1,071	426	233	145
MAX	2,226	369	127	213	1,075	6,831	9,847	4,077	4,692	3,541	2,521	1,314
(WY)	(1924)	(1947)	(1947)	(1974)	(1947)	(1972)	(1952)	(1975)	(1929)	(1905)	(1903)	(1903)
MIN	1.67	1.97	0.02	0.00	0.00	32.8	8.12	3.94	41.7	11.4	0.75	0.29
(WY)	(1959)	(1956)	(1956)	(1950)	(1950)	(1964)	(1905)	(1931)	(2004)	(2002)	(1934)	(1934)

SUMMARY STATISTICS	FOR 2003 CALENDAR YEAR	FOR 2004 WATER YEAR	WATER YEARS 1903 - 2004
ANNUAL TOTAL	46,192.61	49,322.7
ANNUAL MEAN	127	135	a447
HIGHEST ANNUAL MEAN			a1,329 1929
LOWEST ANNUAL MEAN			a52.7 2002
HIGHEST DAILY MEAN	2,400 Mar 18	5,050 Mar 10	39,600 Apr  8, 1952
LOWEST DAILY MEAN	0.00 Aug  6	2.0 Feb 15	0.00 Feb  1, 1932
ANNUAL SEVEN-DAY MINIMUM	0.11 Aug 11	2.1 Feb 10	0.00 Jan 21, 1933
MAXIMUM PEAK FLOW		b5,500 Mar 10	65,000 Mar 23, 1947
MAXIMUM PEAK STAGE		c9.51 Mar 10	20.50 Mar 23, 1947
ANNUAL RUNOFF (AC-FT)	91,620	97,830	323,800
10 PERCENT EXCEEDS	243	303	991
50 PERCENT EXCEEDS	18	21	50
90 PERCENT EXCEEDS	0.89	3.7	1.1

a Based on complete water years only b About c Backwater from ice e Estimated

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