DOLORES RIVER BASIN

09177000 SAN MIGUEL RIVER AT URAVAN, CO

LOCATION.--Lat 38°21'26", long 108°42'44", in SW14NE14 sec.2, T.47 N., R.17 W., Montrose County, Hydrologic Unit 14030003, on right bank 20 ft downstream from bridge on State Highway 141, 400 ft downstream from Tabeguache Creek, and 1.5 mi southeast of Uravan.

DRAINAGE AREA.--1,499 mi2.

PERIOD OF RECORD.--August 1954 to September 1962, October 1973 to September 1994, August 1996 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09177000

REVISED RECORDS.--WRD Colo. 1974: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 5,000 ft above NGVD of 1929, from topographic map. Prior to Sept. 3, 1959, at site 0.5 mi downstream at different datum.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by storage reservoirs, diversions for irrigation of about 28,000 acres upstream from station, and return flow from irrigated areas. 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.--Flood of Sept. 6, 1970, reached a stage of 12.6 ft, from floodmarks, discharge, 8,910 ft3/s, by slope-area measurement at site 5.5 mi downstream.

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	62	97	85	e66	67	74	207	464	1,050	197	38	109
2	66	95	e65	e64	69	68	316	431	1,070	191	56	93
3	253	90	e66	60	66	59	331	426	970	185	85	86
4	121	82	e65	64	55	65	e266	443	884	171	44	81
5	92	84	62	81	50	71	e224	436	839	159	41	72
6	83	84	e62	80	39	65	220	375	729	138	31	348
7	75	84	62	78	36	67	214	313	645	116	26	185
8	73	88	57	74	30	71	193	271	597	102	27	116
9	76	165	48	72	33	72	201	259	627	97	31	179
10	77	183	41	81	50	75	316	231	612	83	28	1,170
11	73	107	e48	e79	52	91	548	199	609	70	21	442
12	74	98	e52	e69	64	130	741	191	572	63	19	321
13	72	90	e54	61	88	168	760	235	509	56	19	305
14	94	99	55	60	132	207	983	291	437	40	78	301
15	104	95	e53	e59	147	177	890	408	429	34	174	279
16	101	91	e62	e57	102	176	618	524	446	34	198	225
17	98	76	75	56	90	166	623	554	384	28	163	207
18	96	89	71	e55	88	147	611	642	338	27	120	194
19	95	82	54	53	80	128	496	686	328	28	101	176
20	89	77	e36	56	74	111	433	642	356	87	79	131
21	86	64	e41	60	70	89	425	655	325	34	75	120
22	88	56	e41	63	68	81	476	760	323	27	53	103
23	111	51	39	64	63	67	442	894	330	24	62	95
24	118	55	36	e63	58	126	355	968	307	26	70	85
25	104	54	e36	e63	71	163	336	916	273	25	87	78
26	137	52	e36	62	73	169	457	880	253	72	118	83
27	237	48	e35	59	73	221	533	954	251	35	91	71
28	116	60	35	e59	75	181	555	1,150	242	29	89	84
29	109	70	56	e59	---	149	547	1,210	218	34	113	80
30	98	71	e65	61	---	e131	499	1,210	209	103	169	76
31	96	---	68	65	---	e124	---	1,130	---	61	141	---
TOTAL	3,174	2,537	1,661	2,003	1,963	3,689	13,816	18,748	15,162	2,376	2,447	5,895
MEAN	102	84.6	53.6	64.6	70.1	119	461	605	505	76.6	78.9	196
MAX	253	183	85	81	147	221	983	1,210	1,070	197	198	1,170
MIN	62	48	35	53	30	59	193	191	209	24	19	71
AC-FT	6,300	5,030	3,290	3,970	3,890	7,320	27,400	37,190	30,070	4,710	4,850	11,690
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1954 - 2003, BY WATER YEAR (WY)
MEAN	138	117	94.4	88.2	105	192	823	1,146	962	412	190	130
MAX	333	385	188	139	226	612	2,154	3,420	2,361	1,306	646	416
(WY)	(1987)	(1987)	(1987)	(1985)	(1958)	(1997)	(1985)	(1984)	(1957)	(1957)	(1999)	(1982)
MIN	30.6	60.9	49.6	49.9	54.1	66.8	110	86.6	87.2	9.15	11.2	16.8
(WY)	(1957)	(1956)	(1977)	(1977)	(1990)	(1977)	(1977)	(1977)	(2002)	(2002)	(2002)	(1956)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1954 - 2003
ANNUAL TOTAL	29,127.8	73,471
ANNUAL MEAN	79.8	201	367
HIGHEST ANNUAL MEAN			758 1984
LOWEST ANNUAL MEAN			78.4 2002
HIGHEST DAILY MEAN	474 Sep 13	1,210 May 29	5,440 May 16, 1984
LOWEST DAILY MEAN	3.2 Aug 29	19 Aug 12	3.2 Aug 29, 2002
ANNUAL SEVEN-DAY MINIMUM	4.2 Jul 11	24 Aug 7	4.2 Jul 11, 2002
MAXIMUM PEAK FLOW		2,130 Sep 10	a8,050 May 10, 1983
MAXIMUM PEAK STAGE		6.33 Sep 10	10.14 May 10, 1983
ANNUAL RUNOFF (AC-FT)	57,770	145,700	266,100
10 PERCENT EXCEEDS	158	550	1,040
50 PERCENT EXCEEDS	67	89	132
90 PERCENT EXCEEDS	6.9	41	57

e Estimated. a From rating curve extended above 4,100 ft3/s.