GUNNISON RIVER BASIN

09147025 UNCOMPAHGRE RIVER BELOW RIDGWAY RESERVOIR, CO

LOCATION.--Lat 38°14'17", long 107°45'31", in NE14SE14 sec.17, T.46 N., R.8 W., Ouray County, Hydrologic Unit 14020006, on right bank 1,600 ft upstream from Fisher Creek, 800 ft downstream from Ridgway Reservoir gate house, and 5.4 mi north of Ridgway.

DRAINAGE AREA.--265 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=09147025

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 6,650 ft above NGVD of 1929, from topographic map.

REMARKS.-- No estimated daily discharges. Records good. Diversions for irrigation by means of numerous canals downstream from station. Flow regulated by Ridgway Reservoir (capacity 84,591 acre-ft). 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	149	31	31	30	30	30	28	72	1,050	274	206	201
2	149	31	31	30	30	30	29	84	1,050	285	226	215
3	149	31	31	30	30	30	29	91	1,020	294	236	243
4	149	31	31	30	30	29	29	92	989	297	236	220
5	149	31	31	30	30	30	29	91	982	298	239	193
6	149	31	31	30	30	29	29	91	957	299	238	193
7	149	31	31	30	30	28	29	91	941	287	236	193
8	120	31	31	30	30	28	28	111	938	279	236	192
9	102	32	31	30	30	28	28	123	722	279	236	153
10	102	31	31	30	30	28	28	125	446	305	239	78
11	102	31	31	30	30	28	28	126	378	321	241	57
12	102	31	31	30	30	28	28	126	378	321	241	84
13	102	31	31	30	30	28	28	127	379	322	245	102
14	102	31	31	30	30	28	28	129	381	311	245	102
15	102	32	30	30	30	28	28	129	381	301	248	100
16	102	31	30	30	30	28	28	129	382	284	250	99
17	102	31	31	30	30	29	28	129	348	274	250	99
18	102	31	31	30	30	30	28	132	326	274	250	99
19	102	31	31	30	30	30	29	132	326	275	250	99
20	102	31	31	30	30	29	30	132	326	277	250	97
21	58	31	31	30	30	30	30	132	326	278	250	97
22	31	31	31	30	30	29	30	132	326	279	250	97
23	31	31	30	30	30	28	30	172	326	279	250	97
24	31	31	31	30	30	29	30	197	297	279	250	127
25	31	31	30	30	30	30	56	199	264	274	246	175
26	31	31	31	30	30	29	72	201	235	274	245	193
27	31	31	30	30	30	30	72	201	233	274	245	193
28	31	31	30	30	30	30	72	398	235	264	218	193
29	31	31	30	30	---	29	72	811	235	240	201	193
30	31	31	30	30	---	29	72	1,020	260	231	201	192
31	31	---	30	30	---	28	---	1,060	---	215	201	---
TOTAL	2,755	932	952	930	840	897	1,105	6,785	15,437	8,744	7,355	4,376
MEAN	88.9	31.1	30.7	30.0	30.0	28.9	36.8	219	515	282	237	146
MAX	149	32	31	30	30	30	72	1,060	1,050	322	250	243
MIN	31	31	30	30	30	28	28	72	233	215	201	57
AC-FT	5,460	1,850	1,890	1,840	1,670	1,780	2,190	13,460	30,620	17,340	14,590	8,680
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1989 - 2003, BY WATER YEAR (WY)
MEAN	125	80.9	69.6	57.3	58.4	82.2	223	322	413	392	317	196
MAX	307	165	105	76.5	93.9	179	560	510	652	846	535	456
(WY)	(1998)	(1999)	(1993)	(1997)	(1997)	(1995)	(1997)	(1997)	(1999)	(1995)	(1992)	(1999)
MIN	55.4	31.1	30.7	30.0	30.0	28.9	36.8	159	199	154	131	68.1
(WY)	(1991)	(2003)	(2003)	(2003)	(2003)	(2003)	(1990)	(1989)	(1989)	(2002)	(2002)	(1993)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1989 - 2003
ANNUAL TOTAL	36,912	51,108
ANNUAL MEAN	101	140	195
HIGHEST ANNUAL MEAN			311 1995
LOWEST ANNUAL MEAN			114 2002
HIGHEST DAILY MEAN	250 Jun 13	1,060 May 31	1,110 Jun 25, 1999
LOWEST DAILY MEAN	30 Dec 15	28 Mar 7	a28 Mar 7, 2003
ANNUAL SEVEN-DAY MINIMUM	30 Dec 25	28 Mar 7	28 Mar 7, 2003
MAXIMUM PEAK FLOW		1,100 May 31	1,160 Jun 13, 1990
MAXIMUM PEAK STAGE		3.44 May 31	b3.56 Jun 13, 1990
ANNUAL RUNOFF (AC-FT)	73,210	101,400	141,500
10 PERCENT EXCEEDS	207	297	451
50 PERCENT EXCEEDS	91	31	109
90 PERCENT EXCEEDS	31	29	46

a Also occurred Mar 8-16, 23, 31, Apr 1, 8-18, 2003. b Maximum gage height, 3.63 ft, Jul 10, 1995.