USGS Water-Year Summary for Site 07130500

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	Available Parameters
	00010 Temperature, water(Max.,Min.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

07130500 ARKANSAS RIVER BELOW JOHN MARTIN RESERVOIR, CO

LOCATION - Lat 38°03'59", long 102°55'55" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 sec.08, T.23 S., R.49 W., Bent County, CO, 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 - 18,494 mi² of which 785 mi² probably is noncontributing.

REVISIONS HISTORY - WSP 1241: 1942 (M). WDR-US-2011: drainage area. March 2023: Assigned measurement gage heights for the measurements on July 7, 2022, and October 6, 2022, were revised on March 27, 2023, due to the adjustments to account for time-of-travel lag between the gage and the measurement location.

SURFACE-WATER RECORDS

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.

GAGE - Water-stage recorder with satellite telemetry, concrete control, and crest-stage gage. 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 - Water year 2014; no estimated daily discharges. Records good except for flows below 3 ft³/s, which are poor. Water year 2015; records good except for flows below 3 ft³/s, and estimated daily discharges, which are poor. Water year 2016; no estimated daily discharges. Records good except for flows below 3 ft³/s, which are poor. Water year 2017; records good except for flows below 3 ft³/s, and estimated daily discharges, which are poor. Water year 2018; no estimated daily discharges. Records good except for flows below 3 ft³/s, which are poor. Water year 2019; records good except for flows below 3 ft³/s, and estimated daily discharges, which are poor. Water year 2020; records good except for flows below 3 ft³/s, and estimated daily discharges, which are poor. Water year 2021; records good except for flows below 3 ft³/s, and estimated daily discharges, which are poor. Water year 2022; records fair except for flows below 3 ft³/s, and estimated daily discharges, which are poor. Water year 2023; records fair except for flows below 3 ft³/s, and 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, groundwater 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.

EXTREMES FOR PERIOD PRIOR TO REGULATION - Maximum discharge, 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.