SAN JUAN RIVER BASIN

09366500 LA PLATA RIVER AT COLORADO-NEW MEXICO STATE LINE

LOCATION.--Lat 36°59'59", long 108°11'17", in NW14SE14 sec.10, T.32 N., R.13 W., La Plata County, CO, Hydrologic Unit 14080105, on right bank at Colorado-New Mexico State line, 0.5 mi downstream from Johnny Pond Arroyo, and 4.9 mi north of La Plata, NM.

DRAINAGE AREA.--331 mi2.

PERIOD OF RECORD.--January 1920 to current year. Monthly discharge only for some periods, published in WSP 1313. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09366500

REVISED RECORDS.--WSP 1313: 1934 (M), 1936 (M).

GAGE.--Water-stage recorder with satellite telemetry and concrete flume. Datum of gage is 5,972.03 ft above NGVD of 1929. See WSP 1713 or 1733 for history of changes prior to Mar. 17, 1934. Mar. 17, 1934 to July 1, 1996, water-stage recorder at same site, and at datum 3.12 ft higher.

REMARKS.--Records good except for estimated daily discharges, which are poor. Diversions upstream from station for irrigation of about 15,000 acres, mostly upstream from station.

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

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	2.7	3.0	3.2	e5.0	0.68	4.2	5.3	43	95	3.4	2.9	1.4
2	3.0	2.9	2.8	e4.0	0.70	4.9	6.0	46	75	1.4	0.44	1.1
3	3.3	2.9	2.6	e4.0	0.65	4.4	14	37	69	0.67	0.00	1.1
4	3.2	3.0	2.3	e4.5	0.62	3.6	14	34	65	1.4	0.00	0.98
5	3.0	2.9	1.4	e5.0	0.74	3.9	11	36	57	1.0	0.00	1.3
6	2.7	2.9	1.0	e6.0	0.76	3.7	9.0	33	49	0.79	0.00	0.95
7	2.6	2.9	0.44	6.3	1.0	4.1	8.5	28	37	0.61	0.00	0.99
8	2.5	3.1	0.47	6.0	1.3	4.2	6.4	27	30	0.44	0.00	0.76
9	2.5	5.2	0.56	6.0	1.3	4.4	5.6	24	30	0.27	0.00	382
10	2.6	4.6	0.79	5.9	1.4	4.2	9.1	21	30	0.16	0.00	124
11	2.4	4.1	1.1	5.9	1.4	3.3	14	18	23	0.05	0.00	22
12	2.2	3.8	1.3	5.9	1.0	3.1	23	16	28	0.01	0.00	31
13	2.2	3.6	1.8	5.4	2.1	3.1	24	19	25	0.00	0.00	20
14	2.4	3.6	2.0	5.3	2.4	4.1	21	24	20	0.00	0.00	18
15	2.4	3.6	2.2	5.4	1.2	4.1	30	41	16	0.00	0.00	15
16	2.5	3.3	1.9	5.2	4.2	3.1	36	52	15	0.00	0.00	17
17	2.5	3.5	3.2	5.1	4.2	7.5	24	55	13	0.00	0.00	15
18	2.6	3.4	4.6	4.9	4.3	6.6	26	64	14	0.00	0.00	10
19	2.6	3.4	e2.8	5.0	3.9	4.5	26	e70	17	0.00	0.00	9.4
20	2.6	3.6	3.1	5.1	3.6	3.6	18	e85	19	0.00	0.00	7.6
21	2.6	3.6	5.0	5.2	3.4	3.5	18	e105	16	0.00	0.00	6.0
22	2.6	3.6	e3.0	5.0	3.1	4.2	20	e130	12	0.00	0.00	5.0
23	2.8	3.9	e3.5	5.0	3.0	4.7	21	e105	8.9	0.00	0.00	4.2
24	2.9	3.9	e3.0	5.0	3.2	5.1	22	59	6.0	0.00	5.3	3.5
25	2.8	3.9	e2.5	5.0	3.8	6.1	e25	54	5.0	0.00	14	2.5
26	2.9	3.8	e2.0	5.0	4.6	7.0	e30	82	6.0	0.00	1.5	2.1
27	3.5	3.7	e2.0	5.1	4.1	7.1	e35	66	6.0	0.00	3.3	3.0
28	3.0	3.7	e3.0	4.4	4.0	6.2	43	74	4.3	0.00	5.2	3.2
29	3.0	4.1	e4.0	2.0	---	6.4	46	84	4.2	0.00	2.3	3.2
30	2.9	3.7	e4.0	1.8	---	5.8	47	94	4.4	0.00	2.6	3.1
31	3.1	---	e4.0	1.6	---	5.5	---	133	---	0.00	4.3	---
TOTAL	84.6	107.2	75.56	151.0	66.65	146.2	637.9	1,759	799.8	10.20	41.84	715.38
MEAN	2.73	3.57	2.44	4.87	2.38	4.72	21.3	56.7	26.7	0.33	1.35	23.8
MAX	3.5	5.2	5.0	6.3	4.6	7.5	47	133	95	3.4	14	382
MIN	2.2	2.9	0.44	1.6	0.62	3.1	5.3	16	4.2	0.00	0.00	0.76
AC-FT	168	213	150	300	132	290	1,270	3,490	1,590	20	83	1,420
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1921 - 2003, BY WATER YEAR (WY)
MEAN	13.4	11.8	12.1	11.8	16.7	36.7	103	107	65.4	19.5	12.0	11.4
MAX	260	99.2	53.9	38.3	53.9	139	364	506	306	99.4	65.1	126
(WY)	(1942)	(1942)	(1987)	(1942)	(1924)	(1997)	(1980)	(1941)	(1957)	(1957)	(1957)	(1927)
MIN	0.097	0.98	1.24	0.80	2.38	0.63	3.06	5.32	1.94	0.019	0.006	0.000
(WY)	(1935)	(1940)	(1978)	(1930)	(2003)	(1977)	(1977)	(1977)	(1924)	(1922)	(1922)	(1956)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1921 - 2003
ANNUAL TOTAL	1,581.83	4,595.33
ANNUAL MEAN	4.33	12.6	35.0
HIGHEST ANNUAL MEAN			109 1973
LOWEST ANNUAL MEAN			4.44 1977
HIGHEST DAILY MEAN	17 Apr 8	382 Sep 9	1,120 May 4, 1941
LOWEST DAILY MEAN	0.00 Mar 29	0.00 Jul 13	a0.00 Jul 3, 1922
ANNUAL SEVEN-DAY MINIMUM	0.16 Mar 24	0.00 Jul 13	0.00 Jul 3, 1922
MAXIMUM PEAK FLOW		1,380 Sep 9	b4,750 Aug 24, 1927
MAXIMUM PEAK STAGE		8.67 Sep 9	11.36 Aug 24, 1927
ANNUAL RUNOFF (AC-FT)	3,140	9,110	25,380
10 PERCENT EXCEEDS	8.8	33	84
50 PERCENT EXCEEDS	3.0	3.8	12
90 PERCENT EXCEEDS	1.1	0.00	1.7

e Estimated. a No flow at times in many years. b From rating curve extended above 750 ft3/s, on basis of slope-area measurement of peak flow, at datum then in use.