RIO GRANDE BASIN

08247500 SAN ANTONIO RIVER AT ORTIZ, CO

LOCATION.--Lat 36°59'35", long 106°02'17", in NE14SE14 sec.24, T.32 N., R.8 E., Rio Arriba County, New Mexico, Hydrologic Unit 13010005, on left bank 800 ft upstream (south) from Colorado-New Mexico State line, 0.4 mi southeast of Ortiz, and 0.4 mi upstream from Los Pinos River.

DRAINAGE AREA.--110 mi2, approximately.

PERIOD OF RECORD.--October 1919 to October 1920, October 1924 to September 1940 (seasonal records only), October 1940 to current year. Monthly discharge only for some periods, published in WSP 1312. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=08247500

REVISED RECORDS.--WSP 1732: 1951. WSP 1923: 1927 (monthly discharge and runoff).

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 7,970 ft above NGVD of 1929, from topographic map. Prior to Apr. 7, 1926, nonrecording gage at various locations near present site, at different datums. Apr. 7, 1926 to June 24, 1954, water-stage recorder on right bank at site
200 ft downstream at present datum.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by diversions for irrigation and return flows from irrigated areas. Statistical summary computed for 1940 to current year, subsequent to conversion of station to year-round records.

COOPERATION.--Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.

EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Oct. 5, 1911, is the greatest since at least 1854, from information obtained from local residents in 1959.

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	3.2	3.9	e2.8	e1.2	e4.0	e3.8	24	141	10	0.00	0.00	3.3
2	2.8	3.5	e2.6	e1.2	e3.8	e3.8	46	129	12	0.00	0.00	2.3
3	3.4	3.5	e2.6	e1.7	e3.4	e4.0	39	133	8.6	0.00	0.00	1.8
4	4.1	3.6	e2.2	e2.2	e3.2	e8.0	27	107	6.6	0.00	0.00	1.7
5	3.2	3.6	e1.4	e2.2	e2.9	e8.0	22	89	5.6	0.00	0.00	2.2
6	3.1	3.2	e1.2	e2.2	e2.8	e10	19	74	4.3	0.00	0.00	2.2
7	2.7	3.1	e0.90	e2.0	e2.8	e14	16	73	3.9	0.00	0.00	5.3
8	2.3	3.2	e1.1	e2.0	e3.0	e16	9.3	68	3.6	0.00	0.00	7.5
9	2.1	3.4	e1.1	e2.2	e3.2	e17	16	57	2.9	0.00	0.00	4.1
10	2.1	8.6	e1.1	e2.2	e3.3	e18	29	59	2.6	0.00	0.00	59
11	2.0	6.9	e1.1	e2.0	e3.7	21	55	53	2.1	0.00	0.00	22
12	1.9	5.4	e1.0	e1.8	e4.7	32	67	56	2.1	0.00	0.00	12
13	1.7	3.9	e1.1	e2.0	e8.0	76	63	57	2.0	0.00	0.00	7.6
14	1.8	5.1	e1.2	e2.2	e30	84	85	55	1.6	0.00	0.00	5.5
15	2.0	5.6	e1.3	e2.2	e20	81	114	53	1.4	0.00	0.00	4.3
16	1.9	3.6	e1.3	e1.8	e12	56	62	52	1.4	0.00	0.00	3.4
17	1.9	3.2	e1.2	e1.8	e14	31	66	44	1.6	0.00	0.00	2.8
18	1.8	2.6	e0.90	e1.8	e13	19	77	41	2.3	0.00	0.00	2.4
19	1.8	3.0	e0.80	e2.3	e9.6	15	64	38	2.0	0.00	0.00	2.1
20	2.0	3.0	e0.90	e2.5	e8.0	10	47	34	3.0	0.00	0.00	1.9
21	2.1	3.3	e0.90	e2.7	e7.8	16	61	31	3.7	0.00	0.00	1.8
22	2.1	3.2	e0.90	e2.7	e5.4	10	100	27	2.3	0.00	0.00	1.7
23	2.2	3.7	e0.90	e3.0	e4.3	14	99	24	1.4	0.00	0.00	1.6
24	2.4	4.2	e0.80	e3.0	e4.8	22	67	23	1.0	0.00	0.00	1.5
25	3.3	3.7	e0.80	e2.7	e4.9	30	85	22	0.72	0.00	0.00	1.5
26	3.4	3.3	e0.80	e2.7	e4.6	30	134	29	0.55	0.00	5.0	1.4
27	3.7	e3.2	e0.90	e3.2	e4.2	39	186	20	0.40	0.00	15	1.3
28	4.8	e2.8	e1.1	e3.2	e4.1	19	215	16	0.32	0.00	7.4	1.3
29	4.8	e3.1	e1.3	e3.0	---	15	223	14	0.16	0.00	7.3	1.2
30	4.2	e3.0	e1.2	e3.2	---	11	204	13	0.07	0.00	7.8	1.2
31	3.6	---	e1.3	e3.7	---	14	---	11	---	0.00	4.3	---
TOTAL	84.4	115.4	38.70	72.6	195.5	747.6	2,321.3	1,643	90.22	0.00	46.80	167.9
MEAN	2.72	3.85	1.25	2.34	6.98	24.1	77.4	53.0	3.01	0.000	1.51	5.60
MAX	4.8	8.6	2.8	3.7	30	84	223	141	12	0.00	15	59
MIN	1.7	2.6	0.80	1.2	2.8	3.8	9.3	11	0.07	0.00	0.00	1.2
AC-FT	167	229	77	144	388	1,480	4,600	3,260	179	0.00	93	333
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2003, BY WATER YEAR (WY)
MEAN	2.97	3.92	2.69	2.31	3.73	17.5	99.3	143	16.4	1.94	2.83	1.33
MAX	12.0	13.8	8.12	6.00	13.0	70.6	302	508	108	12.0	17.7	5.60
(WY)	(1987)	(1987)	(1967)	(1965)	(1962)	(1997)	(1962)	(1941)	(1957)	(1957)	(1957)	(2003)
MIN	0.000	1.04	0.48	0.000	0.25	2.50	8.15	0.91	0.000	0.000	0.000	0.000
(WY)	(1952)	(1956)	(1977)	(1977)	(1990)	(1948)	(2002)	(2002)	(2002)	(1940)	(1951)	(1951)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1940 - 2003
ANNUAL TOTAL	895.46	5,523.42
ANNUAL MEAN	2.45	15.1	25.1
HIGHEST ANNUAL MEAN			61.8 1952
LOWEST ANNUAL MEAN			2.36 2002
HIGHEST DAILY MEAN	18 Apr 1	223 Apr 29	1,050 May 13, 1941
LOWEST DAILY MEAN	0.00 May 30	0.00 Jul 1	a0.00 Jun 24, 1940
ANNUAL SEVEN-DAY MINIMUM	0.00 May 30	0.00 Jul 1	b0.00 Jun 24, 1940
MAXIMUM PEAK FLOW		305 Apr 29	c1,380 May 13, 1941
MAXIMUM PEAK STAGE		3.27 Apr 29	c4.75 May 13, 1941
ANNUAL RUNOFF (AC-FT)	1,780	10,960	18,160
10 PERCENT EXCEEDS	5.8	55	62
50 PERCENT EXCEEDS	2.0	3.1	3.0
90 PERCENT EXCEEDS	0.00	0.00	0.00

e Estimated. a Also occurred Jun 25 to Aug 7, and Aug 19-23, 1940, and on many days during many years. b Also occurred for periods during many years. c From rating curve extended above 1,100 ft3/s. Maximum discharge and gage height for period of record, 1,750 ft3/s, Apr 15, 1937, gage height, 5.38 ft, from rating curve extended above 1,100 ft3/s.