DOLORES RIVER BASIN

09174600 SAN MIGUEL RIVER AT BROOKS BRIDGE NEAR NUCLA, CO

LOCATION.--Lat 38°14'39", long 108°30'05", in NE14NE14 sec.15, T.46 N., R.15 W., Montrose County, Hydrologic Unit 14030003, on right bank at downstream side of Brooks Bridge, 0.5 mi upstream from Tri-State Power Plant, 3 mi upstream from Naturita Creek, and 4.4 mi northeast of Naturita

DRAINAGE AREA.--736 mi2.

PERIOD OF RECORD.--March 1995 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09174600

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 5,570 ft above NGVD of 1929, from topographic map.

REMARKS.--Records good except for estimated daily discharges, which are poor. Diversions for irrigation of several thousand acres upstream from station and diversions upstream for an additional several thousand acres downstream from the gage. One small ditch diverts water from Leopard Creek to Uncompahgre River basin. Slight regulation by Lake Hope and Trout Lake (combined capacity, 5,040 acre-ft) operated by the City of Telluride, Public Service of Colorado, Pacific Light and Power Company, and Tri State Power Company. 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.

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	36	91	84	e65	60	58	219	333	950	169	32	63
2	43	92	64	e64	61	50	307	307	979	175	27	57
3	75	84	e66	e60	58	47	314	299	893	164	24	49
4	66	75	64	e65	48	59	230	314	823	150	21	44
5	55	83	e62	e81	41	56	209	307	784	134	21	81
6	44	79	e62	77	39	53	210	259	666	108	19	153
7	39	81	e62	e75	e36	61	200	203	577	90	15	101
8	43	85	55	e74	e29	60	175	179	543	83	14	78
9	45	107	49	e72	e32	58	206	170	596	70	12	136
10	44	110	e41	e80	50	61	325	143	571	55	e8.8	594
11	39	92	e48	e78	61	68	533	117	577	45	e6.5	438
12	38	92	e52	e67	71	82	666	114	528	39	e6.9	359
13	33	87	e54	e61	91	111	681	158	452	22	e7.4	359
14	93	98	e54	e60	100	158	839	192	378	16	e60	352
15	101	92	e54	e59	94	136	769	280	395	17	115	307
16	99	85	e62	e58	72	147	508	328	407	11	72	245
17	97	76	e75	e56	71	131	549	396	334	12	85	228
18	96	83	72	e55	70	120	525	457	298	10	88	208
19	94	76	e54	e53	63	101	415	463	293	10	64	183
20	87	66	36	e56	62	84	370	453	313	8.0	36	111
21	84	42	e41	e60	58	57	361	499	282	6.6	22	108
22	90	29	e41	e62	58	42	399	632	297	5.7	17	100
23	101	34	38	e64	50	46	356	758	304	7.8	23	95
24	101	34	e36	e64	52	121	276	825	276	11	43	91
25	98	33	e36	e63	63	133	265	764	235	13	73	84
26	108	38	e36	e61	61	151	353	742	226	13	63	78
27	101	45	e36	e60	59	202	388	862	228	9.8	43	e60
28	93	56	e35	e59	61	151	391	1,070	218	11	52	e66
29	100	71	e54	57	---	126	377	1,120	193	63	72	e62
30	87	72	e65	57	---	114	362	1,100	187	68	72	e60
31	93	---	e69	e58	---	134	---	1,030	---	32	95	---
TOTAL	2,323	2,188	1,657	1,981	1,671	2,978	11,778	14,874	13,803	1,628.9	1,309.6	4,950
MEAN	74.9	72.9	53.5	63.9	59.7	96.1	393	480	460	52.5	42.2	165
MAX	108	110	84	81	100	202	839	1,120	979	175	115	594
MIN	33	29	35	53	29	42	175	114	187	5.7	6.5	44
AC-FT	4,610	4,340	3,290	3,930	3,310	5,910	23,360	29,500	27,380	3,230	2,600	9,820
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1995 - 2003, BY WATER YEAR (WY)
MEAN	124	94.0	82.0	79.6	80.9	172	560	780	696	326	169	106
MAX	208	129	106	106	108	486	1,127	1,317	1,631	1,059	539	267
(WY)	(1998)	(1998)	(1998)	(1998)	(1997)	(1997)	(1997)	(1995)	(1995)	(1995)	(1999)	(1999)
MIN	60.0	52.8	50.1	38.1	58.5	74.8	160	76.4	47.5	5.86	6.62	11.4
(WY)	(2002)	(2002)	(2002)	(2002)	(2001)	(2002)	(2002)	(2002)	(2002)	(2002)	(2002)	(2001)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1995 - 2003
ANNUAL TOTAL	22,723.0	61,141.5
ANNUAL MEAN	62.3	168	247
HIGHEST ANNUAL MEAN			499 1997
LOWEST ANNUAL MEAN			59.1 2002
HIGHEST DAILY MEAN	360 Apr 2	1,120 May 29	a2,370 Jun 17, 1995
LOWEST DAILY MEAN	2.9 Jul 1	5.7 Jul 22	2.3 Sep 13, 2001
ANNUAL SEVEN-DAY MINIMUM	3.8 Jun 27	8.4 Jul 18	3.6 Aug 14, 1996
MAXIMUM PEAK FLOW		1,270 Apr 14	3,290 Apr 24, 1998
MAXIMUM PEAK STAGE		4.50 Apr 14	b6.30 Apr 24, 1998
ANNUAL RUNOFF (AC-FT)	45,070	121,300	178,700
10 PERCENT EXCEEDS	110	444	714
50 PERCENT EXCEEDS	52	78	103
90 PERCENT EXCEEDS	5.5	33	30

e Estimated. a Also occurred Jun 18, 1995. b Maximum gage height, 6.32 ft, Jun 17, 1995.