ARKANSAS RIVER BASIN

07083000 HALFMOON CREEK NEAR MALTA, CO

(Hydrologic Benchmark station)

LOCATION.--Lat 39°10'20", long 106°23'19", in SE14SE14 sec.13, T.10 S., R.81 W., Lake County, Hydrologic Unit 11020001, on San Isabel National Forest, on right bank 1.4 mi upstream from culvert on Halfmoon Campground road, 3.3 mi upstream from mouth, and 4.3 mi southwest of Malta.

DRAINAGE AREA.--23.6 mi2.

PERIOD OF RECORD.--August 1946 to current year. Meteorological data available, May 1994 to September 1995. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07083000

REVISED RECORDS.--WSP 2121: Drainage area at site 1.4 mi downstream. WRD Colo. 1968: 1967 (M). WDR CO-79-1: 1976 (M). WDR CO-80-1:
1954 (M).

GAGE.--Water-stage recorder with satellite telemetry and crest-stage gage. Concrete control since 1966. Elevation of gage is 9,830 ft above NGVD of 1929, from topographic map. Prior to Oct. 19, 1966, at sites 1.4 mi downstream at different datums.

REMARKS.--Records good except for estimated daily discharges, which are poor. Several measurements of specific conductance and water temperature were obtained and are published in the "Supplementary Water-Quality Data for Gaging Stations section of this report.

Discharge, cubic feet per second 

WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

DAILY MEAN VALUES

DAY	OCT	NOV	DEC	JAN	FEB	MAR	APR	MAY	JUN	JUL	AUG	SEP
1	9.6	6.7	e3.5	e3.2	e3.3	e2.6	e2.4	10	188	85	35	19
2	10	7.0	e3.5	e3.2	e3.2	e2.6	e2.4	9.4	142	85	29	17
3	12	e7.2	e3.5	e3.4	e3.1	e2.6	2.5	9.1	153	83	29	18
4	10	e7.3	e3.5	e3.4	e3.1	e2.6	2.3	9.4	129	83	27	18
5	10	e7.5	e3.5	e3.4	e3.0	e2.5	2.3	8.6	103	76	25	18
6	9.7	e7.5	e3.5	e3.4	e3.0	e2.5	2.3	7.9	81	72	24	26
7	9.7	e7.5	e3.5	e3.4	e3.0	e2.5	2.3	7.6	73	69	23	34
8	9.7	e7.5	e3.5	e3.4	e3.0	e2.5	2.4	7.4	69	67	22	33
9	9.3	e7.5	e3.5	e3.4	e3.0	e2.5	2.7	7.4	84	66	20	41
10	9.0	e7.0	e3.4	e3.4	e3.0	e2.5	3.6	7.1	113	62	20	43
11	8.7	e6.5	e3.4	e3.4	e3.0	e2.4	4.5	6.8	139	59	19	37
12	8.3	e6.5	e3.4	e3.4	e3.0	e2.4	5.0	8.3	150	57	19	37
13	8.1	e6.0	e3.5	e3.4	e2.9	e2.4	5.7	13	151	53	18	37
14	7.8	e6.0	e3.5	e3.4	e2.9	e2.4	7.1	17	130	49	17	33
15	7.4	e5.5	e3.5	e3.3	e2.9	e2.4	6.9	27	139	44	16	30
16	7.4	e6.0	e3.4	e3.2	e2.9	e2.4	6.6	29	136	42	17	29
17	7.3	e5.5	e3.3	e3.3	e2.9	e2.3	6.3	48	120	40	20	27
18	7.1	e5.0	e3.2	e3.3	e2.8	e2.3	6.1	54	130	39	23	25
19	7.0	e5.0	e3.0	e3.4	e2.8	e2.3	5.7	46	126	38	24	24
20	7.2	e4.5	e3.2	e3.4	e2.8	e2.3	5.9	49	120	38	20	22
21	7.4	e4.0	e3.4	e3.4	e2.8	e2.4	6.0	59	111	37	18	21
22	7.1	e4.5	e3.2	e3.4	e2.8	e2.4	6.1	79	115	36	18	19
23	7.6	e4.5	e3.2	e3.4	e2.7	e2.4	5.6	105	110	35	18	18
24	6.9	e4.0	e3.2	e3.4	e2.7	e2.3	5.6	125	105	31	19	17
25	7.1	e3.5	e3.2	e3.4	e2.7	e2.3	6.7	147	92	30	22	16
26	7.0	e3.5	e3.0	e3.4	e2.7	e2.3	7.6	144	93	31	21	16
27	7.1	e4.0	e3.2	e3.4	e2.7	e2.3	8.4	168	94	31	20	15
28	6.8	e4.0	e3.2	e3.4	e2.6	e2.3	8.9	191	92	33	24	14
29	6.2	e3.5	e3.2	e3.4	---	e2.3	10	210	94	30	20	14
30	7.0	e3.5	e3.2	e3.4	---	e2.4	11	206	89	27	22	13
31	6.9	---	e3.2	e3.4	---	e2.4	---	185	---	28	21	---
TOTAL	252.4	168.2	103.5	104.5	81.3	74.8	160.9	2,001.0	3,471	1,556	670	731
MEAN	8.14	5.61	3.34	3.37	2.90	2.41	5.36	64.5	116	50.2	21.6	24.4
MAX	12	7.5	3.5	3.4	3.3	2.6	11	210	188	85	35	43
MIN	6.2	3.5	3.0	3.2	2.6	2.3	2.3	6.8	69	27	16	13
AC-FT	501	334	205	207	161	148	319	3,970	6,880	3,090	1,330	1,450
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1946 - 2003, BY WATER YEAR (WY)
MEAN	11.2	7.60	5.12	4.11	3.76	3.75	6.81	45.8	129	82.7	34.9	18.0
MAX	24.5	16.6	9.65	9.03	7.90	10.8	13.8	79.1	208	247	128	44.3
(WY)	(1962)	(1962)	(1996)	(1996)	(1986)	(1947)	(1989)	(1996)	(1980)	(1995)	(1995)	(1961)
MIN	6.23	4.40	3.19	1.65	1.70	1.20	2.70	17.7	41.4	12.7	7.11	8.03
(WY)	(1956)	(1992)	(1993)	(1977)	(1948)	(1948)	(1973)	(1995)	(2002)	(2002)	(2002)	(1974)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1946 - 2003
ANNUAL TOTAL	4,300.3	9,374.6
ANNUAL MEAN	11.8	25.7	29.5
HIGHEST ANNUAL MEAN			55.3 1995
LOWEST ANNUAL MEAN			12.2 2002
HIGHEST DAILY MEAN	85 May 31	210 May 29	410 Jul 12, 1995
LOWEST DAILY MEAN	e3.0 Dec 19	e2.3 Mar 17	a1.1 Apr 1, 1948
ANNUAL SEVEN-DAY MINIMUM	e3.2 Dec 22	e2.3 Mar 23	1.2 Mar 27, 1948
MAXIMUM PEAK FLOW		286 May 29	b615 Jun 30, 1984
MAXIMUM PEAK STAGE		3.18 May 29	c3.77 Jun 30, 1984
ANNUAL RUNOFF (AC-FT)	8,530	18,590	21,340
10 PERCENT EXCEEDS	29	85	88
50 PERCENT EXCEEDS	7.0	7.2	9.0
90 PERCENT EXCEEDS	4.0	2.6	3.2

e Estimated. a Also occurred Apr 2, 1948. b From rating curve extended above 254 ft3/s. c Maximum gage height for period of record, 4.32 ft, Apr 24, 1965, backwater from ice.