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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
08358400 RIO GRANDE FLOODWAY AT SAN MARCIAL, NM
LOCATION - Lat 33°40'44.7", long 106°59'49.2" referenced to North American Datum of 1983, Socorro County, NM, Hydrologic Unit 13020203, in Pedro Armendaris Grant No. 33, 0.3 miles downstream from southern pier of the Atchison, Topeka, and Santa Fe Railway Co. bridge, on right bank 1.4 mi downstream from former site of San Marcial, 18.5 mi southwest of San Antonio, and at mile 1,425.2.
DRAINAGE AREA - 27,700 mi² of which 2,940 mi² probably is noncontributing. (from the closed basin in San Luis Valley, Colorado)
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1964 to current year. Records collected at this site January 1895 to September 1964 represent total flow of the river and were published as "Rio Grande at San Marcial" (station 08358500). Records of daily discharge for floodway only, April 1950 to September 1964, are available in files of District office.
GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Datum of gage is 4,455.19 ft above NGVD of 1929.
REMARKS - Water years 2014-2018; records fair except for estimated discharges, which are poor. Water year 2019; records poor. Floodway is one of two channels (station 08358300) carrying flow in valley cross section. Prior to 1950, all flow was in floodway channel. Combined monthly discharge in acre-feet is given at end of each table for the year's 1965 to 2004. Diversion for irrigation of about 775,000 acres upstream from station (includes about 13,800 acre-ft diverted from conveyance channel).
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1905-07, 1946 to current year.
PERIOD OF DAILY RECORD - SUSPENDED-SEDIMENT DISCHARGE: July 1946 to current year.
INSTRUMENTATION - Automatic pumping sediment sampler.
REMARKS - Records of chemical analysis and sediment discharge for years prior to 1946 have been published in Water Bulletins of International Boundary and Water Commission.
