USGS Water-Year Summary 2020
08247500 SAN ANTONIO RIVER AT ORTIZ, CO
LOCATION - Lat 36°59'35", long 106°02'17" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.24, T.32 N., R.8 E., Rio Arriba County, NM, Hydrologic Unit 13010005, on left bank 800 ft upstream (south) from Colorado-New Mexico State line, 0.4 mi southeast of Ortiz, and 0.4 mi upstream from Los Pinos River.
DRAINAGE AREA - 110 mi². approximately.
- WSP 1732: 1951. WSP 1923: 1927 (monthly discharge and runoff).
PERIOD OF RECORD - October 1919 to October 1920, October 1924 to September 1940 (seasonal records only), October 1940 to current year. Monthly discharge only for some periods, published in WSP 1312. Statistical summary computed for 1941 to current year, subsequent to conversion of station to year-round records.
GAGE - Water-stage recorder with satellite telemetry. Elevation of gage is 7,970 ft above NGVD of 1929, from topographic map. Prior to Apr. 7, 1926, nonrecording gage at various locations near present site, at different datums. Apr. 7, 1926 to June 24, 1954, water-stage recorder on right bank at site 200 ft downstream at present datum.
COOPERATION - Records collected and computed by Colorado Division of Water Resources and reviewed by Geological Survey.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of Oct. 5, 1911, is the greatest since at least 1854, from information obtained from local residents in 1959.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 1,380 ft³/s, May 13, 1941, from rating curve extended above 1,100 ft³/s, gage height, 4.75 ft.