GREEN RIVER BASIN

09237450 YAMPA RIVER ABOVE STAGECOACH RESERVOIR, CO

LOCATION.--Lat 40°16'09", long 106°52'49", in SW14SW14 sec.36, T.4 N., R.85 W., Routt County, Hydrologic Unit 14050001, on left bank 1.4 mi downstream from Jack Creek and 4.0 mi east of Oak Creek.

DRAINAGE AREA.--208 mi2.

PERIOD OF RECORD.--October 1988 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09237450

REVISED RECORDS.--WDR CO-00-2: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry and concrete control. Elevation of gage is 7,240 ft above NGVD of 1929, from topographic map.

REMARKS.--Records good except for estimated daily discharges, which are poor. Diversions for irrigation of about 12,000 acres upstream from station. Natural flow of stream affected by 2 diversions for irrigation to Egeria Creek into Colorado River basin and by storage in Stillwater, Yampa and YamColo Reservoirs (total capacity 15,820 acre-ft). Several measurements of specifc 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	22	34	e24	e32	e36	25	79	112	201	79	74	52
2	22	33	e24	e32	e38	27	125	105	225	74	70	47
3	54	31	e25	e31	e35	e23	112	92	159	68	63	46
4	44	36	e26	e32	e34	e25	62	107	145	68	69	42
5	34	35	e27	e32	e34	e24	52	115	136	66	59	41
6	29	40	e24	e31	e34	e23	52	105	131	69	54	51
7	26	36	e26	e31	e30	33	43	95	138	76	59	71
8	23	32	e25	e30	e30	32	39	94	128	76	66	74
9	22	37	30	e32	e29	30	57	108	130	70	60	49
10	21	36	34	e32	e28	e35	96	121	142	73	58	62
11	21	40	e31	e34	e28	e38	138	100	152	71	58	77
12	21	43	e32	e32	e26	39	135	90	137	67	57	60
13	20	43	e34	32	e31	e50	123	90	117	68	53	52
14	23	35	e32	36	e34	e57	130	99	112	68	51	46
15	23	41	e34	e36	e32	66	121	114	98	66	49	44
16	24	44	e32	e34	e29	76	109	124	94	70	47	39
17	23	33	e34	e35	e30	67	92	126	95	74	58	38
18	23	33	e34	e35	e29	52	89	125	96	74	73	38
19	25	43	e32	e36	e27	e64	89	118	95	74	58	39
20	25	33	e32	e35	e28	56	78	104	101	77	52	39
21	24	41	e32	e35	e28	53	74	101	103	76	48	37
22	26	41	e34	e33	e28	53	79	98	98	67	56	36
23	31	38	e35	e32	e28	65	95	95	97	62	72	33
24	32	35	e35	e32	e30	76	107	97	90	66	80	31
25	30	35	e35	e33	33	61	182	91	89	67	67	31
26	29	37	e34	e33	30	61	211	85	89	71	59	31
27	28	27	e34	e32	31	60	166	88	87	70	55	35
28	28	e26	e32	e33	29	49	134	99	82	68	64	35
29	29	e25	e32	e34	---	42	121	105	81	73	53	35
30	29	e23	e32	e36	---	42	126	122	80	74	54	35
31	31	---	e30	e35	---	48	---	124	---	73	60	---
TOTAL	842	1,066	957	1,028	859	1,452	3,116	3,249	3,528	2,195	1,856	1,346
MEAN	27.2	35.5	30.9	33.2	30.7	46.8	104	105	118	70.8	59.9	44.9
MAX	54	44	35	36	38	76	211	126	225	79	80	77
MIN	20	23	24	30	26	23	39	85	80	62	47	31
AC-FT	1,670	2,110	1,900	2,040	1,700	2,880	6,180	6,440	7,000	4,350	3,680	2,670
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1989 - 2003, BY WATER YEAR (WY)
MEAN	50.3	51.4	42.7	41.5	42.0	61.9	113	120	115	99.2	73.0	51.3
MAX	116	85.1	71.1	74.2	75.4	113	259	278	348	167	153	135
(WY)	(1998)	(1998)	(1996)	(1996)	(1996)	(1998)	(1996)	(1996)	(1997)	(1995)	(1997)	(1997)
MIN	27.2	32.0	29.2	21.4	29.4	38.7	48.7	13.9	12.3	17.3	25.3	17.4
(WY)	(2003)	(1995)	(1990)	(1990)	(1991)	(1992)	(1995)	(2002)	(2002)	(2002)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1989 - 2003
ANNUAL TOTAL	11,461.0	21,494
ANNUAL MEAN	31.4	58.9	71.9
HIGHEST ANNUAL MEAN			135 1997
LOWEST ANNUAL MEAN			33.2 2002
HIGHEST DAILY MEAN	116 Apr 1	225 Jun 2	582 Jun 9, 1997
LOWEST DAILY MEAN	5.3 May 10	20 Oct 13	a5.3 May 10, 2002
ANNUAL SEVEN-DAY MINIMUM	8.9 May 8	22 Oct 8	8.9 May 8, 2002
MAXIMUM PEAK FLOW		273 Jun 1	765 Mar 26, 1998
MAXIMUM PEAK STAGE		b4.51 Jun 1	c5.96 Mar 26, 1998
ANNUAL RUNOFF (AC-FT)	22,730	42,630	52,090
10 PERCENT EXCEEDS	48	112	133
50 PERCENT EXCEEDS	30	44	53
90 PERCENT EXCEEDS	12	27	31

e Estimated. a Also occurred May 11, 2002. b Maximum gage height, 6.09 ft, Mar 14, backwater from ice. c Maximum gage height, 7.31 ft, Dec 4, 1997, backwater from ice.