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USGS Water-Year Summary 2024
11137900 Huasna River near Arroyo Grande, CA
LOCATION - Lat 35°04'40", long 120°22'15" referenced to North American Datum of 1927, San Luis Obispo County, CA, Hydrologic Unit 18060007, in Huasna Grant, on right bank, 300 ft downstream from mouth of Huasna Creek, and 12 mi southeast of Arroyo Grande.
DRAINAGE AREA - 103 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1959 to September 1986, October 2003 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 634.57 ft above NAVD of 1988.
REMARKS - No regulation upstream from station; extensive diversions by ranches for irrigation and for cattle ponds. Low flow affected by intermittent pumping for irrigation directly upstream of the gage.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 21,000 ft³/s, Jan. 25, 1969, gage height, 15.90 ft, from rating curve extended above 1,300 ft³/s on basis of slope-area measurement of peak flow; maximum gage height, 18.63 ft, Jan. 9, 2023; no flow at times in some years.
