ARKANSAS RIVER BASIN

07086000 ARKANSAS RIVER AT GRANITE, CO

LOCATION.--Lat 39°02'34", long 106°15'55", in SE14SW14 sec.31, T.11 S., R.79 W., Chaffee County, Hydrologic Unit 11020001, on right bank at Granite, 100 ft east of U.S. Highway 24, 100 ft downstream from county bridge, and 200 ft upstream from Cache Creek.

DRAINAGE AREA.--427 mi2.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--April to October 1895, May to December 1897, August to September 1898, March to October 1899, April to May 1901 (gage heights and discharge measurements only in 1895, 1899, and 1901), April 1910 to current year. Monthly discharge only for some periods, published in WSP 1311. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07086000

REVISED RECORDS.--WSP 1117: Drainage area. WSP 1711: 1952, 1956(M).

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 8,914.86 ft above NGVD of 1929, supplementary adjustment of 1960. Prior to
Apr. 6, 1910, nonrecording gages near present site at different datums. Apr. 6, 1910 to Oct. 25, 1917, water-stage recorder or nonrecording gage at site 832 ft upstream at different datum. Oct. 26, 1917 to Oct. 26, 1960, water-stage recorder at site 168 ft downstream at present datum.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by storage reservoirs, power developments, transmountain diversions from Colorado River Basin (see elsewhere in this report), diversions for irrigation and municipal use, ground-water withdrawals, return flows from irrigated areas, and flows from sewage-treatment plants. Flow partly regulated by Turquoise Lake and Twin Lakes Reservoir, on tributaries upstream from station, combined capacity, about
269,700 acre-ft.

COOPERATION.--Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.

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	84	116	e67	e69	e57	e48	106	201	2,150	544	431	152
2	90	114	e68	e70	e58	e45	157	210	2,080	511	415	141
3	108	107	e66	e80	e52	e42	180	207	1,770	478	408	139
4	109	107	e64	e90	e48	e43	167	210	1,350	461	299	137
5	100	110	e60	e90	e45	e46	160	214	1,160	454	169	130
6	91	106	e60	e80	e45	e47	157	217	1,100	445	171	151
7	90	103	e58	e50	e42	e48	161	213	943	478	169	175
8	90	107	e60	e53	e40	e47	165	214	797	496	260	177
9	88	114	e59	e56	e41	e47	165	215	787	490	519	182
10	89	104	e58	e53	e42	e47	183	216	902	486	518	205
11	102	111	e57	e53	e48	e60	206	209	1,060	476	445	234
12	102	e109	e58	e50	e50	e80	211	203	1,200	464	340	240
13	95	e105	e59	e51	e60	e82	206	220	1,380	457	232	231
14	97	e99	e60	e52	e68	e78	220	249	1,350	455	191	227
15	99	e90	e62	e55	e58	e69	205	300	1,320	454	146	183
16	102	e85	e60	e53	e45	67	169	290	1,280	453	138	105
17	103	e92	e61	e53	e50	66	179	289	1,110	465	149	121
18	103	e82	e59	e52	e51	e66	178	423	983	484	162	208
19	102	e80	e60	e55	e50	e60	171	633	924	483	171	209
20	97	e82	e66	e58	e49	e60	167	615	1,080	482	155	206
21	96	e79	e70	e59	e51	77	180	512	1,040	487	142	204
22	99	e76	e70	e60	e53	e69	223	536	1,080	476	137	191
23	109	e72	e69	e62	e50	79	213	632	997	471	146	154
24	114	e73	e70	e60	e49	86	205	769	715	488	158	120
25	108	e71	e69	e58	e50	88	219	782	580	493	170	98
26	105	e67	e70	e56	e49	e82	226	885	533	510	166	89
27	107	e67	e70	e58	e49	e80	233	1,100	476	528	158	87
28	105	e68	e73	e58	e49	e75	241	1,270	451	491	157	83
29	107	e68	e78	e53	---	e77	225	1,530	447	407	148	84
30	102	e69	e74	e58	---	e76	205	1,930	508	420	152	85
31	115	---	e67	e60	---	e82	---	2,070	---	432	164	---
TOTAL	3,108	2,733	2,002	1,865	1,399	2,019	5,683	17,564	31,553	14,719	7,186	4,748
MEAN	100	91.1	64.6	60.2	50.0	65.1	189	567	1,052	475	232	158
MAX	115	116	78	90	68	88	241	2,070	2,150	544	519	240
MIN	84	67	57	50	40	42	106	201	447	407	137	83
AC-FT	6,160	5,420	3,970	3,700	2,770	4,000	11,270	34,840	62,590	29,200	14,250	9,420
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1910 - 2003, BY WATER YEAR (WY)
MEAN	155	129	110	108	113	129	237	693	1,268	887	528	241
MAX	356	337	448	419	526	500	667	1,711	2,146	2,367	1,239	546
(WY)	(1977)	(1983)	(1983)	(1983)	(1985)	(1985)	(1962)	(1984)	(1984)	(1983)	(1984)	(1961)
MIN	82.4	64.3	48.5	39.8	45.0	55.0	97.1	191	262	150	151	93.8
(WY)	(1932)	(1945)	(1977)	(1918)	(1919)	(1919)	(1933)	(1935)	(2002)	(2002)	(1934)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1910 - 2003
ANNUAL TOTAL	52,644	94,579
ANNUAL MEAN	144	259	385
HIGHEST ANNUAL MEAN			687 1984
LOWEST ANNUAL MEAN			157 2002
HIGHEST DAILY MEAN	393 May 23	2,150 Jun 1	4,990 Jun 30, 1957
LOWEST DAILY MEAN	e57 Dec 11	e40 Feb 8	11 Mar 15, 1918
ANNUAL SEVEN-DAY MINIMUM	e58 Dec 7	e43 Feb 4	31 Jan 10, 1918
MAXIMUM PEAK FLOW		2,220 Jun 1	5,360 Jun 28, 1957
MAXIMUM PEAK STAGE		5.26 Jun 1	7.20 Jun 28, 1957
ANNUAL RUNOFF (AC-FT)	104,400	187,600	278,700
10 PERCENT EXCEEDS	222	558	1,040
50 PERCENT EXCEEDS	141	109	170
90 PERCENT EXCEEDS	72	52	74

e Estimated.