07130500 ARKANSAS RIVER BELOW JOHN MARTIN RESERVOIR, CO
LOCATION.--Lat 38°03'59", long 102°55'55", in NW14NE14 sec.8, T.23 S., R.49 W., Bent County, Hydrologic Unit 11020009, on right bank 0.2 mi downstream from John Martin Dam, 2.6 mi upstream from Caddoa Creek, and 3.5 mi southeast of Hasty.
DRAINAGE AREA.--18,915 mi2, of which 785 mi2 is probably noncontributing.
PERIOD OF RECORD.--April 1938 to current year. Published as "at Caddoa" prior to October 1947. Statistical summary computed for 1949 to current year, subsequent to completion of John Martin Reservoir. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=07130500
REVISED RECORDS.--WSP 1241: 1942(M). WSP 1341: Drainage area.
GAGE.--Water-stage recorder with satellite telemetry and concrete control. Datum of gage is 3,737.40 ft above NGVD of 1929. Prior to Feb. 22, 1940, at site 3 mi upstream at datum 22.83 ft higher. Feb. 22, 1940 to Feb. 4, 1943, at site 700 ft upstream at datum 3.64 ft higher. Feb. 5, 1943 to Apr. 8, 1975, at site 1.5 mi downstream at datum approximately 27.5 ft lower.
REMARKS.--No estimated daily discharges. Records good except for those below 3 ft3/s, which are fair. 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 John Martin Reservoir (station 07130000) 0.2 mi upstream since Oct. 1948.
a Average discharge for 5 years (water years 1939-43), 628 ft3/s; 455,000 acre-ft/yr, prior to start of storage in John Martin Reservoir.
b Also occurred Dec 26, 1979 to Jan 3, 1980; no flow on many days during 1945-47. Minimum daily discharge prior to start of storage in John Martin Reservoir, 5 ft3/s, Jul 16, 1939.
c Maximum discharge for period of record, 40,000 ft3/s, Apr 24, 1942, from rating curve extended above 12,000 ft3/s on basis of flow-over-dam and critical-depth measurement of peak flow, gage height, 10.46 ft, site and datum then in use.