ARKANSAS RIVER BASIN

07093700 ARKANSAS RIVER NEAR WELLSVILLE, CO

LOCATION.--Lat 38°30'10", long 105°56'21", in SW14NE14 sec.14, T.49 N., R.9 E., Chaffee County, Hydrologic Unit 11020001, on right bank 50 ft upstream from Chaffee-Fremont County line, 2.0 mi northwest of Wellsville, 2.8 mi downstream from South Arkansas River, and 3.5 mi southeast of Salida.

DRAINAGE AREA.--1,485 mi2.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--April 1961 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07093700

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 6,883.4 ft above NGVD of 1929 (river-profile survey).

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by transbasin and transmountain diversions, storage reservoirs, power developments, diversions for irrigation and municipal use, ground-water withdrawals, return flows from irrigated areas, and flows from sewage-treatment plants.

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	228	245	223	214	221	207	190	237	3,320	903	679	341
2	240	240	222	206	221	209	205	239	3,240	884	668	330
3	265	237	224	217	221	198	243	247	2,960	822	649	332
4	267	227	216	237	205	205	250	242	2,440	802	644	344
5	255	224	217	239	200	210	230	239	2,120	779	579	328
6	246	217	216	239	213	202	221	244	1,860	755	578	336
7	229	211	212	e220	e202	203	221	236	1,490	720	616	377
8	230	209	212	e210	e198	202	227	232	1,210	755	585	441
9	232	237	205	215	195	197	225	235	1,150	744	554	402
10	228	238	205	e213	196	189	224	233	1,430	721	665	475
11	205	224	203	e218	217	188	245	234	1,580	723	662	528
12	196	221	197	e218	212	194	256	228	1,710	695	589	499
13	184	225	207	e214	226	193	257	228	1,840	696	479	489
14	181	238	214	213	233	188	263	246	1,830	721	390	482
15	182	238	210	215	225	194	274	300	1,750	700	345	459
16	186	222	209	201	217	196	252	374	1,810	700	313	393
17	184	221	212	200	212	192	234	402	1,700	706	314	347
18	197	228	209	198	214	206	238	495	1,560	716	326	368
19	207	220	189	213	212	190	237	733	e1,380	717	389	394
20	207	219	188	213	205	178	235	805	e1,610	740	390	390
21	206	228	e212	217	207	185	216	651	1,580	742	366	382
22	218	230	e210	213	217	191	233	665	1,510	731	367	385
23	226	228	e210	215	207	192	255	878	1,520	711	382	363
24	238	228	e207	218	197	201	245	1,170	1,250	723	413	327
25	239	231	e202	217	217	199	246	1,580	990	719	439	299
26	234	216	e200	212	219	192	254	1,600	944	737	466	283
27	230	206	e202	212	210	196	262	2,010	865	778	461	262
28	231	213	230	218	214	193	269	2,550	844	819	430	256
29	228	221	229	213	---	188	308	2,920	844	706	416	251
30	234	228	229	208	---	185	273	3,180	830	670	392	249
31	236	---	218	216	---	185	---	3,310	---	677	366	---
TOTAL	6,869	6,770	6,539	6,672	5,933	6,048	7,288	26,943	49,167	23,012	14,912	11,112
MEAN	222	226	211	215	212	195	243	869	1,639	742	481	370
MAX	267	245	230	239	233	210	308	3,310	3,320	903	679	528
MIN	181	206	188	198	195	178	190	228	830	670	313	249
AC-FT	13,620	13,430	12,970	13,230	11,770	12,000	14,460	53,440	97,520	45,640	29,580	22,040
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 2003, BY WATER YEAR (WY)
MEAN	405	417	380	354	348	336	387	1,034	2,064	1,428	868	500
MAX	750	581	636	576	729	647	896	2,344	3,930	3,521	1,889	1,031
(WY)	(1985)	(1983)	(1983)	(1983)	(1985)	(1993)	(1962)	(1984)	(1980)	(1995)	(1984)	(1970)
MIN	222	226	211	207	208	195	215	380	417	278	260	218
(WY)	(2003)	(2003)	(2003)	(1977)	(1977)	(2003)	(1977)	(2002)	(2002)	(2002)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1961 - 2003
ANNUAL TOTAL	104,744	171,265
ANNUAL MEAN	287	469	716
HIGHEST ANNUAL MEAN			a1,135 1984
LOWEST ANNUAL MEAN			318 2002
HIGHEST DAILY MEAN	564 May 23	3,320 Jun 1	5,980 Jun 12, 1980
LOWEST DAILY MEAN	179 Sep 16	178 Mar 20	110 Jan 12, 1963
ANNUAL SEVEN-DAY MINIMUM	187 Oct 12	187 Oct 12	147 Jan 11, 1963
MAXIMUM PEAK FLOW		3,540 May 31	6,240 Jun 12, 1980
MAXIMUM PEAK STAGE		6.95 May 31	b8.02 Jun 12, 1980
ANNUAL RUNOFF (AC-FT)	207,800	339,700	518,700
10 PERCENT EXCEEDS	383	880	1,600
50 PERCENT EXCEEDS	265	236	439
90 PERCENT EXCEEDS	210	198	258

e Estimated. a Highest annual mean, also occurred 1995 water year. b Maximum gage height, 8.40 ft, Jun 23, 1995.