DOLORES RIVER BASIN

09165000 DOLORES RIVER BELOW RICO, CO

LOCATION.--Lat 37°38'20", long 108°03'35", Dolores County, Hydrologic Unit 14030002, on left bank at upstream side of Montelores bridge northwest of State Highway 145, at Dolores-Montezuma County line, 0.5 mi upstream from Ryman Creek, and 4.0 mi southwest of Rico.

DRAINAGE AREA.--105 mi2.

PERIOD OF RECORD.--October 1951 to September 1996, October 1998 to September 2003 (discontinued). For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09165000

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 8,422.23 ft above NGVD of 1929.

REMARKS.--Records fair except for estimated daily discharges, which are poor. No diversion upstream from station. Several measurements of specific conductance and water temperature were obtained and are published in the "Supplemental Water-Quality Data For Gaging Stations" section of this report.

EXTREMES OUTSIDE PERIOD OF RECORD.--Greatest flood since at least 1885 occurred Oct. 5, 1911.

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	31	23	e11	e11	e11	e9.1	e46	268	737	62	36	61
2	36	23	e11	e11	e11	e8.7	e47	269	731	62	32	53
3	49	17	e10	e11	e11	e8.4	e49	298	667	59	32	46
4	40	23	e10	e11	e11	e8.8	e52	306	605	55	34	44
5	44	19	e10	e11	e11	e10	e58	216	536	50	25	45
6	41	20	e10	e11	e11	e11	e64	182	445	46	22	63
7	41	20	e10	e11	e10	e13	e65	171	383	42	25	69
8	40	22	e10	e11	e10	e14	e65	160	352	40	31	53
9	39	25	e10	e11	e10	e14	e64	138	338	38	23	152
10	37	26	e11	e11	e9.9	e15	e64	133	317	36	21	411
11	35	23	e11	e11	e9.8	e18	e68	145	289	33	24	270
12	33	23	e11	e11	e9.8	e24	e74	225	252	32	24	224
13	31	27	e11	e11	e9.2	e26	e81	306	216	30	44	216
14	30	21	e11	e10	e9.2	e30	e90	363	190	28	114	178
15	28	19	e11	e10	e9.2	e34	e97	413	183	28	65	142
16	26	19	e11	e9.9	e9.2	e44	e97	449	176	30	66	120
17	25	22	e11	e9.5	e9.7	e48	e97	544	151	35	66	106
18	27	19	e11	e9.4	e9.8	e47	e101	528	141	39	57	93
19	23	17	e11	e9.1	e9.8	e39	e108	521	141	31	57	83
20	22	14	e11	e9.1	e9.8	e37	e119	561	147	29	42	74
21	22	12	e11	e9.2	e9.8	e35	e125	647	120	27	37	68
22	23	12	e11	e9.6	e9.1	e37	e126	757	114	29	35	61
23	25	13	e11	e9.8	e8.6	e40	111	782	110	31	50	57
24	27	13	e11	e9.9	e8.8	e52	105	740	100	28	55	52
25	23	11	e11	e9.9	e8.8	e63	136	727	89	25	85	49
26	24	e12	e11	e9.9	e8.8	e66	202	763	84	25	59	45
27	25	14	e11	e10	e9.2	e66	270	822	81	29	56	43
28	21	11	e11	e10	e9.2	e64	308	890	77	36	101	41
29	24	9.1	e11	e10	---	e59	289	863	72	91	98	39
30	23	e10	e11	e10	---	e56	263	799	69	41	92	37
31	24	---	e11	e10	---	e50	---	794	---	33	79	---
TOTAL	939	539.1	334	318.3	273.7	1,047.0	3,441	14,780	7,913	1,200	1,587	2,995
MEAN	30.3	18.0	10.8	10.3	9.78	33.8	115	477	264	38.7	51.2	99.8
MAX	49	27	11	11	11	66	308	890	737	91	114	411
MIN	21	9.1	10	9.1	8.6	8.4	46	133	69	25	21	37
AC-FT	1,860	1,070	662	631	543	2,080	6,830	29,320	15,700	2,380	3,150	5,940
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1952 - 2003, BY WATER YEAR (WY)
MEAN	43.2	28.9	21.6	18.6	18.3	31.2	128	451	535	164	81.1	62.3
MAX	133	65.9	42.6	37.7	33.7	72.2	242	1,015	1,288	646	267	224
(WY)	(1973)	(1987)	(1958)	(1958)	(1984)	(1972)	(1962)	(1958)	(1957)	(1957)	(1999)	(1982)
MIN	14.5	12.1	7.81	7.74	7.49	11.0	42.9	98.9	36.3	16.7	14.2	17.1
(WY)	(1957)	(1957)	(1990)	(1990)	(1994)	(1964)	(1975)	(1977)	(2002)	(2002)	(2002)	(1956)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1952 - 2003
ANNUAL TOTAL	13,362.2	35,367.1
ANNUAL MEAN	36.6	96.9	132
HIGHEST ANNUAL MEAN			230 1957
LOWEST ANNUAL MEAN			37.8 2002
HIGHEST DAILY MEAN	e152 Apr 6	890 May 28	1,810 Jun 10, 1952
LOWEST DAILY MEAN	e7.4 Mar 8	e8.4 Mar 3	4.8 Nov 29, 1989
ANNUAL SEVEN-DAY MINIMUM	9.8 Aug 13	e8.9 Feb 25	6.3 Dec 11, 1989
MAXIMUM PEAK FLOW		1,000 May 28	a2,170 May 24, 1984
MAXIMUM PEAK STAGE		4.90 May 28	b5.95 May 24, 1984
ANNUAL RUNOFF (AC-FT)	26,500	70,150	95,800
10 PERCENT EXCEEDS	108	270	390
50 PERCENT EXCEEDS	22	34	39
90 PERCENT EXCEEDS	11	10	15

e Estimated. a From rating curve extended above 1620 ft3/s. b Maximum gage height, 6.15 ft, Jun 10, 1952. .