USGS Water-Year Summary 2020
09371010 SAN JUAN RIVER AT FOUR CORNERS, CO
LOCATION - Lat 37°00'04.1", long 109°01'46.5" referenced to North American Datum of 1983, Montezuma County, CO, Hydrologic Unit 14080201, on right bank 0.1 mi north of New Mexico-Colorado State line, 2,800 ft upstream from bridge on U.S. Highway 160, 1.0 mi east of Four Corners Monument, 3.0 mi downstream from Mancos River, and at mile 187.2.
DRAINAGE AREA - 14,600 mi². (approximately)
PERIOD OF RECORD - October 1977 to current year.
GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Elevation of gage is 4,600 ft above NGVD of 1929, from topographic map. Prior to August 2003, gage was located on left bank (about 1,300 ft upstream of U.S. Highway 160 bridge). In August 2003, gage was moved to right bank. In March 2009, gage was moved about 1,500 ft upstream to its current location.
PERIOD OF RECORD - Water years 1978 to 1981, 1985 to current year.
PERIOD OF DAILY RECORD -
WATER TEMPERATURE: March 2014 to current year.
SPECIFIC CONDUCTANCE: May 2016 to current year.
pH: May 2016 to current year.
TURBIDITY: May 2016 to current year.
INSTRUMENTATION - Water-quality monitor since March 2014 (water temperature only prior to May 2016). Electronic data logger with 15-minute recording interval.