ARKANSAS RIVER BASIN

07130500 ARKANSAS RIVER BELOW JOHN MARTIN RESERVOIR, CO

LOCATION.--Lat 38°03'59", long 102°55'55", in NW14NE14 sec.8, T.23 S., R.49 W., Bent County, Hydrologic Unit 11020009, on right bank 0.2 mi downstream from John Martin Dam, 2.6 mi upstream from Caddoa Creek, and 3.5 mi southeast of Hasty.

DRAINAGE AREA.--18,915 mi2, of which 785 mi2 is probably noncontributing.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--April 1938 to current year. Published as "at Caddoa" prior to October 1947. Statistical summary computed for 1949 to current year, subsequent to completion of John Martin Reservoir. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07130500

REVISED RECORDS.--WSP 1241: 1942(M). WSP 1341: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry and concrete control. Datum of gage is 3,737.40 ft above NGVD of 1929. Prior to Feb. 22, 1940, at site 3 mi upstream at datum 22.83 ft higher. Feb. 22, 1940 to Feb. 4, 1943, at site 700 ft upstream at datum 3.64 ft higher. Feb. 5, 1943 to Apr. 8, 1975, at site 1.5 mi downstream at datum approximately 27.5 ft lower.

REMARKS.--No estimated daily discharges. Records good except for those below 3 ft3/s, which are fair. Natural flow of stream affected by storage reservoirs, power developments, transbasin and transmountain diversions, diversions for irrigation and municipal use, ground-water withdrawals, return flows from irrigated areas, and flows from sewage-treatment plants. Flow completely regulated by John Martin Reservoir (station 07130000) 0.2 mi upstream since Oct. 1948.

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	30	2.2	1.5	1.3	1.4	1.2	1.3	184	541	862	199	25
2	25	2.1	1.5	1.3	1.4	1.2	1.2	144	656	650	77	25
3	25	2.1	1.5	1.3	1.4	1.2	1.2	111	815	383	77	25
4	20	2.1	1.5	1.3	1.4	1.1	1.3	110	815	319	77	26
5	16	2.0	1.4	1.3	1.3	1.2	1.2	242	787	282	76	25
6	14	1.9	1.4	1.3	1.2	1.2	1.3	354	790	252	86	24
7	14	1.7	1.4	1.3	1.3	1.2	1.2	311	792	236	94	24
8	24	1.7	1.4	1.4	1.3	1.2	1.3	271	791	210	68	31
9	27	1.7	1.4	1.2	1.3	1.1	1.3	285	549	173	44	38
10	19	1.6	1.4	1.2	1.3	1.1	1.3	295	454	118	44	69
11	18	1.6	1.4	1.2	1.3	1.2	18	295	459	79	58	102
12	18	1.6	1.4	1.2	1.3	1.2	31	294	461	69	99	65
13	17	1.6	1.4	1.2	1.4	1.1	31	293	462	69	124	32
14	15	1.6	1.4	1.2	1.4	1.5	54	293	464	68	102	34
15	14	1.6	1.4	1.2	1.4	1.4	193	296	467	67	62	27
16	13	1.6	1.4	1.2	1.4	1.3	243	292	618	66	42	21
17	16	1.6	1.4	1.2	1.4	1.3	181	96	780	57	41	20
18	21	1.6	1.4	1.2	1.3	1.3	167	24	860	43	38	21
19	20	1.5	1.3	1.2	1.2	1.4	177	31	910	37	33	21
20	17	1.5	1.4	1.2	1.2	1.3	176	45	634	38	33	22
21	16	1.5	1.4	1.2	1.2	1.3	176	45	460	43	32	21
22	15	1.6	1.3	1.2	1.2	1.3	175	35	462	49	32	50
23	10	1.5	1.3	1.2	1.1	1.3	175	25	516	49	31	80
24	14	1.4	1.4	1.2	1.1	1.3	172	31	575	50	31	82
25	22	1.5	1.3	1.2	1.1	1.3	173	31	574	50	26	83
26	30	1.5	1.2	1.2	1.2	1.3	174	32	503	50	18	87
27	30	1.5	1.2	1.2	1.2	1.2	173	294	446	50	19	91
28	62	1.5	1.3	1.3	1.2	1.1	174	494	447	60	22	91
29	84	1.5	1.3	1.4	---	1.2	174	527	446	72	25	87
30	84	1.5	1.4	1.4	---	1.2	180	543	652	74	25	49
31	45	---	1.4	1.4	---	1.2	---	541	---	74	25	---
TOTAL	795	49.9	42.8	38.8	35.9	38.4	3,029.6	6,864	18,186	4,699	1,760	1,398
MEAN	25.6	1.66	1.38	1.25	1.28	1.24	101	221	606	152	56.8	46.6
MAX	84	2.2	1.5	1.4	1.4	1.5	243	543	910	862	199	102
MIN	10	1.4	1.2	1.2	1.1	1.1	1.2	24	446	37	18	20
AC-FT	1,580	99	85	77	71	76	6,010	13,610	36,070	9,320	3,490	2,770
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1949 - 2003, BY WATER YEAR (WY)
MEAN	197	25.6	16.6	19.4	22.9	53.0	419	476	596	695	557	320
MAX	565	217	317	725	477	498	1,174	2,576	2,665	2,895	2,127	1,007
(WY)	(1949)	(1966)	(1998)	(1998)	(1966)	(1998)	(1987)	(1987)	(1987)	(1995)	(1965)	(1984)
MIN	11.4	0.85	0.64	0.62	0.75	1.06	2.43	34.2	52.0	86.1	22.6	6.69
(WY)	(1975)	(1977)	(1977)	(1977)	(1977)	(1980)	(1973)	(1975)	(1954)	(1963)	(1960)	(1974)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1949 - 2003
ANNUAL TOTAL	39,543.6	36,937.4
ANNUAL MEAN	108	101	a285
HIGHEST ANNUAL MEAN			745 1987
LOWEST ANNUAL MEAN			82.5 1964
HIGHEST DAILY MEAN	911 Jun 18	910 Jun 19	3,830 Aug 25, 1965
LOWEST DAILY MEAN	1.1 Feb 9	1.1 Feb 23	b0.36 Dec 25, 1979
ANNUAL SEVEN-DAY MINIMUM	1.2 Jan 24	1.2 Feb 19	0.36 Dec 25, 1979
MAXIMUM PEAK FLOW		955 Jun 19	c4,100 Aug 25, 1965
MAXIMUM PEAK STAGE		3.42 Jun 19	d5.75 Aug 25, 1965
ANNUAL RUNOFF (AC-FT)	78,430	73,270	206,100
10 PERCENT EXCEEDS	495	408	873
50 PERCENT EXCEEDS	24	20	57
90 PERCENT EXCEEDS	1.3	1.2	2.0

a Average discharge for 5 years (water years 1939-43), 628 ft3/s; 455,000 acre-ft/yr, prior to start of storage in John Martin Reservoir. b Also occurred Dec 26, 1979 to Jan 3, 1980; no flow on many days during 1945-47. Minimum daily discharge prior to start of storage in John Martin Reservoir, 5 ft3/s, Jul 16, 1939. c Maximum discharge for period of record, 40,000 ft3/s, Apr 24, 1942, from rating curve extended above 12,000 ft3/s on basis of flow-over-dam and critical-depth measurement of peak flow, gage height, 10.46 ft, site and datum then in use. d Maximum gage height for period of record, 10.62 ft, Jun 18, 1965 (backwater from Caddoa Creek), site and datum then in use.