USGS Water-Year Summary 2021
11299600 Black Creek near Copperopolis, CA
LOCATION - Lat 37°57'40", long 120°36'51" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.02, T.1 N., R.12 E., Calaveras County, CA, Hydrologic Unit 18040010, on left bank, 100 ft upstream from O'Byrnes Ferry Road Bridge, 1,300 ft upstream from Copper Creek, and 2.1 mi southeast of Copperopolis.
DRAINAGE AREA - 14.4 mi².
- WDR CA-86-3: 1984 (instantaneous maximum discharge).
PERIOD OF RECORD - August 1983 to current year.
GAGE - Water-stage recorder. Datum of gage is 746.13 ft above NGVD of 1929.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 5,200 ft³/s, Feb. 19, 1986, gage height, 9.10 ft, from rating curve extended above 2,500 ft³/s, on basis of contracted-opening measurement of peak flow; no flow at times each year.