USGS Water-Year Summary 2019
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)
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.
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.