GREEN RIVER BASIN

09240900 ELK RIVER ABOVE CLARK, CO

LOCATION.--Lat 40°44'36", long 106°51'17", in SE14NW14 sec.18, T.9 N., R.84 W., Routt County, Hydrologic Unit 14050001, on right bank 0.7 mi downstream from Coulton Creek, 1.5 mi upstream from Willow Creek, and 4.2 mi northeast of Clark.

DRAINAGE AREA.--122 mi2.

PERIOD OF RECORD.--October 1987 to September 1993. April 1998 to current year (seasonal records only). For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=09240900

REVISED RECORDS.--WDR CO-92-2: 1991.

GAGE.--Water-stage recorder. Elevation of gage is 7,520 ft above NGVD of 1929, from topographic map. Prior to Apr. 1998 at site 90 ft upstream at same datum.

REMARKS.--Records fair except for estimated daily discharges, which are poor. 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.

AVERAGE DISCHARGE.--5 years (water years 1988-93), 200 ft3/s; 144,700 acre-ft/yr.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge (occurred during period of seasonal record), 3,090 ft3/s, June 1, 2003, gage height, 5.03 ft; maximum gage height 6.13 ft, June 16, 1993 (at site then in use); minimum daily, 17 ft3/s, Nov. 9, 10, and 13, 1987.

EXTREMES FOR CURRENT YEAR (seasonal only).--Maximum discharge, 3,090 ft3/s, June 1, gage height, 5.03 ft; minimum daily, 44 ft3/s, Sept. 30.

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	289	2,570	534	e99	57
2	---	---	---	---	---	---	76	259	1,960	519	e92	54
3	---	---	---	---	---	---	71	285	1,600	488	e88	54
4	---	---	---	---	---	---	64	295	1,370	458	e93	54
5	---	---	---	---	---	---	60	263	1,180	429	e84	51
6	---	---	---	---	---	---	59	227	1,040	400	e78	62
7	---	---	---	---	---	---	56	227	924	374	e84	65
8	---	---	---	---	---	---	55	220	905	352	e82	62
9	---	---	---	---	---	---	63	205	1,040	330	e77	57
10	---	---	---	---	---	---	86	198	1,310	305	e77	85
11	---	---	---	---	---	---	121	186	1,560	284	e76	102
12	---	---	---	---	---	---	156	217	1,300	266	e77	89
13	---	---	---	---	---	---	189	311	1,110	251	77	76
14	---	---	---	---	---	---	261	428	1,160	247	75	65
15	---	---	---	---	---	---	283	590	1,200	e220	67	60
16	---	---	---	---	---	---	216	823	1,170	e210	64	56
17	---	---	---	---	---	---	185	1,160	1,010	e210	87	55
18	---	---	---	---	---	---	179	1,200	974	e204	109	65
19	---	---	---	---	---	---	156	1,120	1,010	e200	93	69
20	---	---	---	---	---	---	160	1,090	1,020	e195	75	63
21	---	---	---	---	---	---	188	1,180	901	e190	69	57
22	---	---	---	---	---	---	212	1,280	839	e188	66	54
23	---	---	---	---	---	---	201	1,510	854	e168	80	52
24	---	---	---	---	---	---	176	1,800	775	e150	78	50
25	---	---	---	---	---	---	176	1,860	698	e153	102	48
26	---	---	---	---	---	---	238	1,700	570	e136	89	47
27	---	---	---	---	---	---	294	2,070	552	e134	73	46
28	---	---	---	---	---	---	339	2,260	577	e123	67	45
29	---	---	---	---	---	---	374	2,360	567	e133	61	45
30	---	---	---	---	---	---	356	2,320	549	e122	60	44
31	---	---	---	---	---	---	---	2,210	---	e107	61	---
TOTAL	---	---	---	---	---	---	5,112	30,143	32,295	8,080	2,460	1,789
MEAN	---	---	---	---	---	---	170	972	1,076	261	79.4	59.6
MAX	---	---	---	---	---	---	374	2,360	2,570	534	109	102
MIN	---	---	---	---	---	---	55	186	549	107	60	44
AC-FT	---	---	---	---	---	---	10,140	59,790	64,060	16,030	4,880	3,550

e Estimated.