USGS Water-Year Summary 2019
11151870 Arroyo Seco near Greenfield, CA
LOCATION - Lat 36°14'15", long 121°28'50" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.36, T.19 S., R.4 E., Monterey County, CA, Hydrologic Unit 18060005, in Mt. Diablo meridian, on right bank, 0.6 mi downstream from Rocky Creek, and 14.5 mi southwest of Greenfield.
DRAINAGE AREA - 113 mi².
PERIOD OF RECORD - Water year 1961 to current year (1987 to 2019 only discharge measurements and annual peaks).
WATER TEMPERATURE: Water years 1963-75, 1978-84.
SEDIMENT DATA: Water years 1962-84 (revised).
GAGE - Datum of gage is 780 ft above NGVD of 1929, from topographic map.