ARKANSAS RIVER BASIN

07099400 ARKANSAS RIVER ABOVE PUEBLO, CO

LOCATION.--Lat 38°16'18", long 104°43'03", in NE14NE14 sec.36, T.20 S., R.66 W., Pueblo County, Hydrologic Unit 11020002, on left bank 200 ft downstream from northeast corner of Arkansas River bridge, 0.4 mi downstream from Pueblo Dam, and 7 mi west of Pueblo.

DRAINAGE AREA.--4,670 mi2.

WATER-DISCHARGE RECORDS

PERIOD OF RECORD.--October 1965 to current year. Statistical summary computed for 1975 to current year subsequent to completion of Pueblo Reservoir. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07099400

GAGE.--Water-stage recorder with satellite telemetry. Elevation of gage is 4,740 ft above NGVD of 1929, from topographic map. Prior to Mar. 23, 1967, at site 730 ft upstream at datum 2.23 ft higher. Mar. 24, 1967 to May 23 1974 at present site at datum 1.00 ft higher. May 24, 1974 to Feb. 24, 1975, at site 2,000 ft downstream, at different datum. Feb. 25, 1975 to Sept. 30, 2001, at or within 50 ft of present location at datum 1.00 ft higher.

REMARKS.--Records good except for estimated daily discharges, which are poor. Natural flow of stream affected by storage reservoirs, power developments, transbasin and transmountain diversions, diversions for irrigation and municipal use, ground-water withdrawals, return flows from irrigated areas, and flows from sewage-treatment plants. Flow completely regulated by Pueblo Reservoir (station 07099350) 0.4 mi upstream since Jan. 9, 1974.

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	e0.55	82	0.46	1.3	20	27	e91	181	4,020	816	280	223
2	e0.55	82	0.45	1.3	21	27	211	144	4,530	759	400	165
3	e25	82	0.57	1.2	21	27	239	142	4,690	607	376	91
4	103	93	0.57	1.3	22	28	256	142	4,160	581	367	84
5	103	102	0.57	1.3	22	27	290	156	3,400	690	368	105
6	104	102	0.61	1.4	23	27	309	165	2,100	693	383	117
7	103	103	0.64	1.4	22	27	310	165	1,570	692	387	133
8	95	103	0.59	1.5	23	27	261	69	1,260	689	197	167
9	53	103	0.63	1.7	23	27	237	37	1,020	689	141	214
10	32	103	0.66	1.7	23	27	237	60	953	685	141	255
11	26	103	0.75	1.6	26	27	233	55	1,360	567	138	285
12	8.7	103	0.82	1.7	27	27	224	55	1,590	502	138	328
13	1.3	103	0.71	1.7	27	28	224	178	1,630	499	136	342
14	1.3	93	0.68	1.8	27	27	213	252	1,710	523	145	332
15	4.6	1.5	0.67	1.6	27	27	196	269	1,710	556	149	331
16	9.0	0.84	0.73	8.3	27	27	196	357	1,700	516	135	297
17	1.0	0.62	0.65	20	26	27	196	559	1,650	488	135	220
18	1.0	0.60	0.76	20	27	58	178	589	1,590	428	136	137
19	1.1	0.47	0.79	20	27	108	232	639	1,600	393	136	113
20	1.1	0.53	0.77	20	27	160	232	758	1,450	303	136	146
21	1.1	0.52	0.77	20	27	180	210	952	1,520	262	135	151
22	1.1	0.45	0.81	20	27	180	211	1,030	1,620	264	135	126
23	8.5	0.50	0.96	20	28	180	229	1,080	1,390	264	e135	113
24	15	0.52	1.0	20	28	147	230	1,260	1,210	243	e135	88
25	15	0.56	1.1	20	27	126	210	1,580	1,110	217	e160	66
26	16	0.46	1.0	20	27	125	139	1,990	973	186	e185	48
27	16	0.50	0.92	20	27	126	140	2,030	893	176	184	42
28	33	0.54	1.0	20	27	104	141	2,010	892	192	203	40
29	e60	0.50	1.1	20	---	89	142	2,220	893	241	237	40
30	e82	0.50	1.2	20	---	69	175	2,690	859	263	309	40
31	82	---	1.3	20	---	e56	---	3,290	---	247	278	---
TOTAL	1,003.90	1,366.61	24.24	330.8	706	2,169	6,392	25,104	55,053	14,231	6,520	4,839
MEAN	32.4	45.6	0.78	10.7	25.2	70.0	213	810	1,835	459	210	161
MAX	104	103	1.3	20	28	180	310	3,290	4,690	816	400	342
MIN	0.55	0.45	0.45	1.2	20	27	91	37	859	176	135	40
AC-FT	1,990	2,710	48	656	1,400	4,300	12,680	49,790	109,200	28,230	12,930	9,600
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 2003, BY WATER YEAR (WY)
MEAN	338	247	153	167	201	308	574	1,151	2,292	1,562	986	432
MAX	1,103	505	553	558	837	718	1,389	2,564	4,219	4,110	2,716	1,040
(WY)	(1985)	(1985)	(1987)	(1985)	(1985)	(1985)	(1985)	(1984)	(1980)	(1995)	(1984)	(1982)
MIN	32.4	45.6	0.78	10.7	25.2	70.0	125	374	386	281	16.5	4.10
(WY)	(2003)	(2003)	(2003)	(2003)	(2003)	(2003)	(1978)	(1978)	(2002)	(2002)	(2002)	(2002)

SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1975 - 2003
ANNUAL TOTAL	51,811.06	117,739.55
ANNUAL MEAN	142	323	a703
HIGHEST ANNUAL MEAN			1,227 1984
LOWEST ANNUAL MEAN			174 2002
HIGHEST DAILY MEAN	870 Jun 9	4,690 Jun 3	b5,910 Jun 23, 1997
LOWEST DAILY MEAN	0.45 Nov 22	0.45 Nov 22	c0.45 Nov 22, 2002
ANNUAL SEVEN-DAY MINIMUM	0.49 Nov 26	0.49 Nov 26	0.49 Nov 26, 2002
MAXIMUM PEAK FLOW		4,760 Jun 3	d6,060 Jun 23, 1997
MAXIMUM PEAK STAGE		7.20 Jun 3	f7.29 Jun 23, 1997
ANNUAL RUNOFF (AC-FT)	102,800	233,500	509,100
10 PERCENT EXCEEDS	356	952	1,780
50 PERCENT EXCEEDS	107	103	368
90 PERCENT EXCEEDS	0.58	0.80	86

e Estimated. a Average discharge for 8 years (water years 1966-73), 643 ft3/s; 465,900 acre-ft/yr, prior to completion of Pueblo Dam. b Also the maximum daily discharge for period of record. c Also occurred Dec 2, 2002. Also minimum daily discharge for period of record. d Maximum discharge for period of record, 10,100 ft3/s, Aug 1, 1966, from rating curve extended above 1,600 ft3/s, on basis of slope-area measurement of peak flow. f Datum then in use; maximum gage height, 7.57 ft, Jun 14, 1985, datum then in use; maximum gage height for period of record, 13.12 ft, Aug 1, 1966, site and datum then in use.