Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins

Water-Year Summary for Site 11141280

Click to hide Water-Year Summary instructions and information
  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30

Print this page
USGS Water-Year Summary 2020
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.
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. Elevation of gage is 580 ft above NGVD of 1929, from topographic map. 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.