USGS Water-Year Summary 2020
11372350 Old Cow Creek below Diversion to Olsen Powerplant, near Whitmore, CA
LOCATION - Lat 40°40'10", long 121°53'27" referenced to North American Datum of 1927, in NW 1/4 SW 1/4 sec.32, T.33 N., R.1 E., Shasta County, CA, Hydrologic Unit 18020151, on right bank, 1.2 mi downstream from Kilarc Powerhouse, 2.2 mi upstream from Glendenning Creek, and 3.0 mi north of Whitmore.
DRAINAGE AREA - 32.6 mi².
PERIOD OF RECORD - January 1990 to September 1991 (operated as low-flow station only); October 1996 to September 1997; October 1998 to September 2003; October 2004 to current year.
GAGE - Water-stage recorder. Elevation of gage is 2,340 ft above NGVD of 1929, from topographic map. The gage datum was lowered by 3.00 ft Nov. 21, 2017 for new gage location about 20 ft. downstream of previous gage location.
COOPERATION - Records, including discharge for Olsen Powerplant (station 11372330), were provided by Synergics Incorporated, under general supervision of the U.S. Geological Survey, in connection with Federal Energy Regulatory Commission project no. 8361.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,280 ft³/s, Jan. 1, 1997, gage height, 7.29 ft; minimum daily, 6.9 ft³/s, Aug. 7, 9, 1997.