SUMMARY STATISTICS	FOR 2002 CALENDAR YEAR	FOR 2003 WATER YEAR	WATER YEARS 1951 - 2003
ANNUAL MEAN	83.4	44.0	223
HIGHEST ANNUAL MEAN			1,012 1965
LOWEST ANNUAL MEAN			19.8 1979
HIGHEST DAILY MEAN	985 Aug 30	163 Jun 21	101,000 Jun 18, 1965
LOWEST DAILY MEAN	12 Aug 11	2.5 Sep 18	0.00 Jul  9, 1954
ANNUAL SEVEN-DAY MINIMUM	14 Aug 16	2.7 Sep 16	0.00 Jul  9, 1954
MAXIMUM PEAK FLOW		187 Jun 14	158,000 Jun 17, 1965
MAXIMUM PEAK STAGE		3.32 Jun 14	14.80 Jun 17, 1965
ANNUAL RUNOFF (AC-FT)	60,340	31,840	161,700
10 PERCENT EXCEEDS	135	61	458
50 PERCENT EXCEEDS	59	48	126
90 PERCENT EXCEEDS	24	5.2	10

e Estimated.

ARKANSAS RIVER BASIN

07137500 ARKANSAS RIVER NEAR COOLIDGE, KS

LOCATION.--Lat 38°01'34", long 102°00'41", in NW 14 NE 14 NW 14 sec.26, T.23 S., R.43 W., Hamilton County, Hydrologic Unit 11030001, on right bank at downstream side of county highway bridge, 1.0 mi south of Coolidge, 1.9 mi downstream from Colorado-Kansas State line, and at mile 1,099.3 .

DRAINAGE AREA.--25,410 mi2, of which 1,708 mi2 is probably noncontributing.

PERIOD OF RECORD.--May to October 1903, March to May 1921, October 1950 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/ks/nwis/inventory/?site_no=07137500

REVISED RECORDS.--WSP 1341: 1903, drainage area.

GAGE.--Water-stage recorder. Datum of gage is 3,330.84 ft above NGVD of 1929. May 5 to Oct. 31, 1903, nonrecording gage, and Mar. 1 to May 31, 1921, water-stage recorder at present site at different datum. Oct. 1, 1950, to Mar. 31, 1966, water-stage recorder at site 0.3 mi upstream at datum 3.00 ft higher.

REMARKS.--Records good except those for estimated daily discharges, which are poor. Combined flow of river and Frontier Ditch (station 07137000) represents entire flow that enters Kansas. Flow regulated since 1948 by John Martin Reservoir (station 07130000). Natural flow of stream affected by transmountain diversions, storage reservoirs, power developments, ground-water withdrawals and diversions for irrigation of about 500,000 acres, and return flow from irrigated areas. Satellite telemeter at station.

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	48	59	57	59	59	62	36	36	28	39	4.5	25
2	49	59	59	59	59	62	36	40	29	34	4.3	19
3	50	60	59	59	59	60	35	41	37	29	3.6	9.2
4	51	61	58	59	58	60	35	41	38	31	3.4	9.2
5	48	59	59	59	59	59	34	42	90	25	3.0	16
6	47	59	59	59	59	59	36	37	95	18	4.3	11
7	46	59	60	59	57	57	37	32	122	16	3.2	17
8	46	59	58	60	58	57	37	30	153	14	2.6	24
9	46	60	61	59	60	57	37	29	153	12	10	14
10	46	58	60	59	60	59	36	27	142	11	6.0	9.9
11	49	55	59	59	59	59	37	26	127	11	4.1	5.2
12	48	56	60	60	58	58	37	28	116	11	3.0	4.1
13	49	56	61	60	59	56	37	28	109	12	5.5	3.9
14	44	57	60	60	60	54	35	25	130	9.4	3.7	3.7
15	41	57	59	59	60	52	31	24	105	13	12	3.4
16	38	60	60	58	59	52	29	30	98	11	8.0	3.2
17	39	61	58	60	60	52	28	27	91	9.4	8.3	2.7
18	44	56	58	60	60	52	30	31	86	10	6.0	2.5
19	44	56	56	60	60	55	30	29	127	8.8	6.2	2.5
20	41	57	56	60	60	53	32	26	149	7.0	4.4	2.5
21	46	58	58	60	60	52	31	25	163	5.9	3.3	2.9
22	46	59	57	59	60	48	30	26	151	5.6	5.1	2.6
23	50	59	58	e50	61	48	31	28	125	6.0	3.4	3.2
24	50	56	57	e48	59	49	31	31	111	5.5	4.1	3.2
25	50	56	53	62	53	57	32	35	97	4.6	4.4	4.5
26	46	57	52	61	52	52	45	35	83	4.5	5.4	10
27	49	59	51	58	62	44	45	36	81	4.5	6.5	14
28	52	59	57	59	63	44	40	34	78	5.0	5.7	12
29	55	59	61	59	---	41	37	30	62	8.2	4.7	18
30	59	58	60	58	---	38	37	29	45	13	41	15
31	58	---	59	58	---	38	---	28	---	8.0	21	---
MEAN	47.6	58.1	58.1	58.7	59.0	53.1	34.8	31.2	101	13.0	6.80	9.11
MAX	59	61	61	62	63	62	45	42	163	39	41	25
MIN	38	55	51	48	52	38	28	24	28	4.5	2.6	2.5
AC-FT	2,930	3,460	3,570	3,610	3,280	3,260	2,070	1,920	5,990	798	418	542
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2003, BY WATER YEAR (WY)
MEAN	134	122	127	134	140	134	214	318	484	357	329	179
MAX	332	424	534	972	602	658	1,221	2,478	8,221	2,255	1,979	1,079
(WY)	(1998)	(1998)	(1998)	(1998)	(1966)	(1998)	(1987)	(1999)	(1965)	(1995)	(1965)	(1965)
MIN	1.97	1.53	3.94	3.14	5.52	5.63	9.43	6.61	4.20	3.59	1.94	0.90
(WY)	(1979)	(1979)	(1979)	(1979)	(1978)	(1978)	(1979)	(1963)	(1954)	(1974)	(1964)	(1960)