GREEN RIVER BASIN

09241000 ELK RIVER AT CLARK, CO

LOCATION.--Lat 40°43'03", long 106°54'55", in NW14NW14 sec.27, T.9 N., R.85 W., Routt County, Hydrologic Unit 14050001, on left bank 15 ft downstream from bridge on State Highway 129, 0.8 mi north of Clark, and 2.0 mi upstream from Cottonwood Gulch.

DRAINAGE AREA.--216 mi2.

PERIOD OF RECORD.--May 1910 to September 1922 (published as "near Clark"), April 1930 to September 1991. Monthly discharge only for some periods, published in WSP 1313. 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=09241000

REVISED RECORDS.--WSP 1733: 1956. WDR CO-88-2: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 7,267.75 ft above NGVD of 1929 (State Highway bench mark). May 1910 to
Sept. 1922, nonrecording gage at site 30 ft upstream at datum 0.15 ft lower. Apr. 23, 1930 to Sept. 27, 1934, water-stage recorder at present site
at datum 0.15 ft lower.

REMARKS.--No estimated daily discharges. Records fair. Diversions upstram from station for irrigation of about 230 acres upstream from and about 460 acres downstream from station. Natural flow of stream affected by storage in Lester Creek Reservoir (known also as Pearl Lake), capacity, 5,660 acre-ft, since 1963, and Steamboat Lake, capacity, 23,060 acre-ft, since 1968. Several measurements for 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.--73 years (water years 1910-22, 1930-91), 333 ft3/s; 241,300 acre-ft/yr.

EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 4,910 ft3/s, May 23, 1984 gage height, 6.12 ft; minimum daily determined, 22 ft3/s,
Dec. 12, 1963, but a lesser discharge may have occurred during periods of no gage height record prior to 1939.

EXTREMES FOR CURRENT YEAR (seasonal only).--Maximum discharge, 4,090 ft3/s, June 1, gage height, 5.71 ft; minimum daily, 50 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	---	---	---	---	---	---	87	657	3,430	635	119	63
2	---	---	---	---	---	---	112	586	2,650	615	111	59
3	---	---	---	---	---	---	106	668	2,130	568	107	59
4	---	---	---	---	---	---	93	681	1,840	524	112	60
5	---	---	---	---	---	---	88	614	1,610	481	103	57
6	---	---	---	---	---	---	86	525	1,410	440	96	67
7	---	---	---	---	---	---	81	537	1,280	408	92	71
8	---	---	---	---	---	---	79	540	1,250	377	90	70
9	---	---	---	---	---	---	88	503	1,300	350	119	63
10	---	---	---	---	---	---	125	479	1,410	323	119	85
11	---	---	---	---	---	---	183	444	1,650	301	116	113
12	---	---	---	---	---	---	243	502	1,410	282	118	96
13	---	---	---	---	---	---	314	683	1,240	268	120	81
14	---	---	---	---	---	---	452	881	1,280	252	120	70
15	---	---	---	---	---	---	512	1,170	1,310	236	109	66
16	---	---	---	---	---	---	430	1,460	1,290	223	106	62
17	---	---	---	---	---	---	435	1,910	1,140	223	128	60
18	---	---	---	---	---	---	422	1,890	1,110	220	155	68
19	---	---	---	---	---	---	373	1,750	1,140	265	141	74
20	---	---	---	---	---	---	387	1,670	1,150	249	116	68
21	---	---	---	---	---	---	464	1,750	1,050	239	83	63
22	---	---	---	---	---	---	523	1,850	991	207	109	59
23	---	---	---	---	---	---	496	2,070	1,000	184	127	58
24	---	---	---	---	---	---	425	2,320	941	168	124	56
25	---	---	---	---	---	---	426	2,350	865	161	151	54
26	---	---	---	---	---	---	572	2,150	704	155	142	53
27	---	---	---	---	---	---	714	2,610	670	153	113	51
28	---	---	---	---	---	---	829	2,910	695	142	95	51
29	---	---	---	---	---	---	913	3,100	686	152	88	51
30	---	---	---	---	---	---	836	3,050	657	141	71	50
31	---	---	---	---	---	---	---	2,900	---	125	67	---
TOTAL	---	---	---	---	---	---	10,894	45,210	39,289	9,067	3,467	1,958
MEAN	---	---	---	---	---	---	363	1,458	1,310	292	112	65.3
MAX	---	---	---	---	---	---	913	3,100	3,430	635	155	113
MIN	---	---	---	---	---	---	79	444	657	125	67	50
AC-FT	---	---	---	---	---	---	21,610	89,670	77,930	17,980	6,880	3,880