ARKANSAS RIVER BASIN

07109500 ARKANSAS RIVER NEAR AVONDALE, CO

LOCATION.--Lat 38°14'53", long 104°23'55", in NE14SW14 sec.1, T.21 S., R.63 W., Pueblo County, Hydrologic Unit 11020002, on right bank 15 ft downstream from bridge on Nyberg Road (revised), 0.3 mi upstream from Sixmile Creek, and 2.6 mi west of Avondale.

DRAINAGE AREA.--6,327 mi2.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--May 1939 to September 1951, February 1965 to current year. Statistical summary computed for 1975 to current year, subsequent to partial regulation by Pueblo Reservoir. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07109500

REVISED RECORDS.--WSP 1087: 1942. WSP 1311: Drainage area.

GAGE.--Water-stage recorder with satellite telemetry. Datum of gage is 4,509.53 ft above NGVD of 1929. Prior to Feb. 1, 1965, at site 550 ft downstream at datum 0.37 ft lower. Feb. 1, 1965 to Sept. 30, 1991, at datum 1.00 ft higher.

REMARKS.--Records good except for estimated daily discharges, which are fair. Natural flow of stream affected by transbasin and transmountain diversions, storage reservoirs, power development, ground-water withdrawals, diversions for irrigation and municipal use, return flows from irrigated areas, and flows from sewage-treatment plants. Flow partly regulated by Pueblo Reservoir (station 07099350) 21 mi upstream since Jan. 9, 1974.

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	115	245	145	179	198	242	235	385	3,780	958	395	892
2	150	244	149	172	193	257	314	375	4,720	888	483	522
3	196	252	156	174	186	268	385	360	4,960	769	495	347
4	225	e265	163	180	182	259	489	345	4,720	702	482	325
5	217	282	165	179	186	251	537	336	3,900	716	515	307
6	214	278	165	178	e180	226	580	371	3,040	753	492	281
7	213	277	160	171	e170	212	627	376	1,920	755	487	292
8	218	290	156	173	e180	192	584	356	1,650	761	425	325
9	212	299	148	168	e190	197	475	250	1,330	752	260	359
10	186	294	148	163	e195	202	442	250	1,280	743	390	422
11	182	294	153	161	215	205	415	280	1,500	710	280	466
12	170	308	152	162	225	204	364	251	1,830	603	260	468
13	153	317	157	161	219	202	332	254	1,910	601	246	516
14	146	318	161	164	231	200	321	454	2,050	597	234	512
15	155	271	158	166	238	213	301	496	2,060	663	223	520
16	167	197	157	158	228	211	306	704	2,000	620	227	505
17	174	170	170	162	211	220	330	746	2,030	637	218	457
18	161	148	175	157	205	309	307	790	2,060	556	252	349
19	146	146	179	153	230	459	660	780	2,040	523	386	270
20	144	145	175	152	255	447	504	895	2,630	544	263	278
21	144	143	174	153	248	477	425	1,040	2,170	493	236	300
22	150	135	173	158	233	486	396	1,210	1,960	425	223	276
23	160	133	177	e165	222	429	437	1,200	1,780	398	225	265
24	181	e135	177	e190	e210	398	574	1,370	1,450	384	241	239
25	197	e145	e170	219	e210	403	614	1,600	1,340	331	225	221
26	200	152	e165	219	e215	453	462	2,260	1,240	302	282	207
27	206	155	e175	215	230	343	369	2,260	1,200	289	309	183
28	369	155	181	216	233	339	331	2,180	1,070	324	296	175
29	262	144	183	208	---	293	311	2,170	1,050	582	428	178
30	238	138	180	203	---	277	307	2,470	1,030	571	633	188
31	244	---	181	203	---	249	---	3,070	---	488	961	---
TOTAL	5,895	6,475	5,128	5,482	5,918	9,123	12,734	29,884	65,700	18,438	11,072	10,645
MEAN	190	216	165	177	211	294	424	964	2,190	595	357	355
MAX	369	318	183	219	255	486	660	3,070	4,960	958	961	892
MIN	115	133	145	152	170	192	235	250	1,030	289	218	175
AC-FT	11,690	12,840	10,170	10,870	11,740	18,100	25,260	59,270	130,300	36,570	21,960	21,110
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 2003, BY WATER YEAR (WY)
MEAN	514	467	354	375	412	534	843	1,600	2,603	1,784	1,273	610
MAX	1,631	985	718	770	1,103	994	1,884	4,170	4,971	4,432	3,210	1,511
(WY)	(1985)	(1985)	(1987)	(1985)	(1985)	(1985)	(1987)	(1980)	(1997)	(1995)	(1984)	(1982)
MIN	187	170	165	177	211	219	220	460	426	352	120	138
(WY)	(1979)	(1979)	(2003)	(2003)	(2003)	(1978)	(1978)	(2002)	(2002)	(2002)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1975 - 2003
ANNUAL TOTAL	103,745	186,494
ANNUAL MEAN	284	511	a949
HIGHEST ANNUAL MEAN			1,626 1985
LOWEST ANNUAL MEAN			324 2002
HIGHEST DAILY MEAN	899 Jul 7	4,960 Jun 3	12,300 May 1, 1999
LOWEST DAILY MEAN	87 Sep 7	115 Oct 1	b87 Sep 7, 2002
ANNUAL SEVEN-DAY MINIMUM	90 Sep 3	140 Nov 19	90 Sep 3, 2002
MAXIMUM PEAK FLOW		5,000 Jun 2	c20,900 Apr 30, 1999
MAXIMUM PEAK STAGE		5.32 Jun 2	d10.60 Apr 30, 1999
ANNUAL RUNOFF (AC-FT)	205,800	369,900	687,800
10 PERCENT EXCEEDS	443	1,200	2,180
50 PERCENT EXCEEDS	281	265	577
90 PERCENT EXCEEDS	120	158	264

e Estimated. a Average discharge for 20 years (water years 1940-51, 1966-73), 867 ft3/s; 628,100 acre-ft/yr, prior to completion of Pueblo Dam. b Minimum daily discharge for period of record, 50 ft3/s, Apr 2, 1940. c From rating curve extended above 11,500 ft3/s on basis of velocity-area study. Maximum discharge and stage for period of record, about 50,000 ft3/s, June 18, 1965, gage height, 9.77 ft, datum then in use, from rating curve extended above 6,700 ft3/s, on basis of records for station near Pueblo and indirect measurements of peak flow on Fountain Creek at Pueblo, Chico Creek near North Avondale, and Arkansas River near Avondale. d From floodmark.