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USGS Water-Year Summary 2024
10263500 Big Rock Creek near Valyermo, CA
LOCATION - Lat 34°25'15", long 117°50'19" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.20, T.4 N., R.9 W., Los Angeles County, CA, Hydrologic Unit 18090206, on left bank, 0.1 mi upstream from Punchbowl Canyon, and 1.9 mi southeast of Valyermo.
DRAINAGE AREA - 22.9 mi².
REVISIONS HISTORY - WSP 1314: 1938-39. WSP 1564: 1932, 1937, 1939 (instantaneous maximum discharge). WSP 1927: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - January 1923 to current year. Monthly discharge only for June 1938 to January 1939, published in WSP 1314. Prior to October 1954, published as "Rock Creek near Valyermo."
WATER TEMPERATURE: Water years 1962-79.
GAGE - Water-stage recorder and concrete control. Datum of gage is 4,035.68 ft above NAVD of 1988. Prior to May 4, 1938, at same site at different datums. May 4, 1938, to Jan. 26, 1939, at site 0.2 mi downstream (below Punchbowl Canyon) at different datum.
REMARKS - No regulation or diversion upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 8,300 ft³/s, Mar. 2, 1938, gage height unknown, on basis of slope-area measurement of peak flow; maximum gage height, 7.70 ft, Jan. 25, 1969; minimum daily, 0.70 ft³/s, Nov. 5, 1951.
