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USGS Water-Year Summary 2024
11141280 Lopez Creek near Arroyo Grande, CA
LOCATION - Lat 35°14'08", long 120°28'17" referenced to North American Datum of 1927, in SE 1/4 sec.19, T.31 S., R.14 E., San Luis Obispo County, CA, Hydrologic Unit 18060006, on left bank, 3.4 mi north of Lopez Lake Spillway, and 9.2 mi northeast of Arroyo Grande.
DRAINAGE AREA - 20.9 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1967 to current year.
CHEMICAL DATA: Water year 1977.
WATER TEMPERATURE: Water years 1968-72.
SEDIMENT DATA: Water years 1968-72.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 562.80 ft above NAVD of 1988. Prior to Oct. 31, 1984, at site 0.4 mi downstream at different datum.
REMARKS - Small diversions upstream from station for domestic use.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,830 ft³/s, Jan. 25, 1969, gage height, 9.26 ft in gage well, 10.8 ft from floodmarks, site and datum then in use, from rating curve extended above 300 ft³/s, on basis of slope-area measurement of peak flow, maximum gage height, 12.42 ft, Dec. 31, 2004; minimum daily discharge, 0.30 ft³/s, Aug. 1, 1977.
