COLORADO RIVER MAIN STEM

09034250 COLORADO RIVER AT WINDY GAP NEAR GRANBY, CO

LOCATION.--Lat 40°06'30", long 106°00'13" in NW14 sec.27, T.2 N., R.77 W., Grand County, Hydrologic Unit 14010001, on right bank 300 ft downstream from county highway bridge, 1.1 mi downstream from Windy Gap diversion dam, 2.4 mi downstream from mouth of Fraser River, and 3.8 mi northwest of Granby.

DRAINAGE AREA.--789 mi2.

WATER-DISCHARGERECORDS

PERIOD OF RECORD.--October 1981 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09034250

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 7,790 ft above NGVD of 1929, from topographic map.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by transmountain diversions, storage reservoirs, and diversions for irrigation.

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	53	102	e67	e63	e65	e66	e106	100	1,780	369	281	134
2	56	90	e63	e63	e64	e68	e107	101	1,460	456	243	99
3	58	79	e58	e63	e64	e71	e105	102	837	361	242	94
4	60	70	e62	e63	e64	e69	e117	105	406	331	259	93
5	70	77	e71	e63	e63	e68	e94	103	168	316	201	91
6	75	68	e75	e63	e57	e71	e84	100	107	318	212	92
7	65	60	e73	e57	e60	e71	e117	103	115	319	214	102
8	62	102	e73	e66	e60	e67	e111	202	107	330	211	150
9	51	95	e58	e63	e60	e77	e99	435	102	317	208	143
10	58	75	e62	e64	e60	e73	e160	358	98	317	168	155
11	50	96	e62	e58	e60	e77	e145	189	98	319	126	140
12	49	78	e52	e58	e60	e83	e117	106	110	322	118	121
13	54	76	e66	e62	e60	e84	e120	110	125	312	118	108
14	46	82	e41	e64	e60	e84	e120	115	203	301	126	101
15	52	93	e77	e63	e66	e94	e118	209	186	318	115	96
16	69	90	e65	e63	e68	e117	e118	134	191	341	110	93
17	50	98	e69	e63	e61	e114	e115	120	117	345	192	76
18	53	82	e77	e63	e62	e113	118	157	167	335	288	70
19	53	e70	e73	e63	e62	e76	101	203	177	346	238	77
20	62	e66	e58	e61	e63	e71	99	232	187	417	149	79
21	58	e66	e58	e57	e66	e74	122	199	195	394	128	77
22	64	e66	e55	e58	e68	e88	167	201	213	360	121	74
23	62	e66	e58	e60	e65	e89	136	237	220	342	122	66
24	83	e66	e64	e60	e64	e104	94	351	217	358	134	69
25	85	e73	e64	e60	e71	e113	98	703	219	338	149	67
26	76	e78	e63	e60	e73	e92	145	724	220	305	168	58
27	62	e72	e63	e63	e59	e78	307	647	231	323	158	68
28	75	e67	e63	e65	e68	e71	235	907	231	332	152	67
29	68	e67	e63	e65	---	e72	119	1,440	226	335	105	64
30	68	e67	e63	e65	---	e85	107	1,740	217	343	122	62
31	64	---	e63	e65	---	e103	---	1,780	---	326	163	---
TOTAL	1,911	2,337	1,979	1,924	1,773	2,583	3,801	12,213	8,930	10,546	5,341	2,786
MEAN	61.6	77.9	63.8	62.1	63.3	83.3	127	394	298	340	172	92.9
MAX	85	102	77	66	73	117	307	1,780	1,780	456	288	155
MIN	46	60	41	57	57	66	84	100	98	301	105	58
AC-FT	3,790	4,640	3,930	3,820	3,520	5,120	7,540	24,220	17,710	20,920	10,590	5,530
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1982 - 2003, BY WATER YEAR (WY)
MEAN	110	101	80.0	77.8	77.9	112	288	632	891	505	178	112
MAX	341	188	120	110	110	260	881	2,326	2,997	2,096	509	384
(WY)	(2000)	(1986)	(1985)	(1985)	(1985)	(1984)	(1996)	(1984)	(1984)	(1983)	(1997)	(1999)
MIN	59.9	73.8	63.8	59.0	63.3	75.8	120	123	180	120	74.3	54.4
(WY)	(1982)	(2002)	(2003)	(1989)	(2003)	(1983)	(2002)	(2001)	(2001)	(2002)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1982 - 2003
ANNUAL TOTAL	34,467	56,124
ANNUAL MEAN	94.4	154	264
HIGHEST ANNUAL MEAN			726 1984
LOWEST ANNUAL MEAN			96.7 2002
HIGHEST DAILY MEAN	290 Jun 5	1,780 May 31	4,930 May 25, 1984
LOWEST DAILY MEAN	29 Aug 27	e41 Dec 14	29 Aug 27, 2002
ANNUAL SEVEN-DAY MINIMUM	40 Sep 3	51 Oct 9	40 Sep 3, 2002
MAXIMUM PEAK FLOW		1,980 May 30	5,260 May 25, 1984
MAXIMUM PEAK STAGE		5.25 May 30	7.34 May 25, 1984
ANNUAL RUNOFF (AC-FT)	68,370	111,300	191,400
10 PERCENT EXCEEDS	167	319	579
50 PERCENT EXCEEDS	73	90	107
90 PERCENT EXCEEDS	56	60	68

e Estimated.