USGS Water-Year Summary 2021
11335000 Cosumnes River at Michigan Bar, CA
LOCATION - Lat 38°30'01", long 121°02'39" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.36, T.8 N., R.8 E., Sacramento County, CA, Hydrologic Unit 18040013, on downstream side of midstream pier of county bridge at Michigan Bar, 5.5 mi southwest of Latrobe, and 16.3 river mi downstream from confluence of North and Middle Forks of Cosumnes River.
DRAINAGE AREA - 536 mi².
- WSP 331: 1911-12. WSP 1315-A: 1908-9, 1911 (instantaneous maximum discharge). WSP 1930: Drainage area.
PERIOD OF RECORD - October 1907 to current year. Monthly discharge only for some periods, published in WSP 1315-A.
GAGE - Water-stage recorder. Elevation of gage is 168.09 ft above NGVD of 1929. Prior to July 10, 1930, nonrecording gage at same site and datum.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood in March 1907 reached a stage of 16.3 ft, estimated discharge, 71,000 ft³/s.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 93,000 ft³/s, Jan. 2, 1997, gage height, 18.54 ft, from rating curve extended above 34,000 ft³/s on basis of slope-area determination of peak flow; no flow at times in many years.
PERIOD OF RECORD
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 1953-80, 2002-06, October 16, 2012, to 2016.
SEDIMENT DATA: Water years 1958-74, 2002-06, October 16, 2012 to 2016.
CONTINUOUS WATER-QUALITY DATA:
pH: Water years December 2001 to November 2002.
SPECIFIC CONDUCTANCE: Water years December 2001 to September 2004.
WATER TEMPERATURE: Water years October 1962 to January 1979, December 2001 to September 2004, March 2012 to March 2016.
SEDIMENT DATA: Water years October 1962 to September 1970.
INSTRUMENTATION - Water-quality monitor from December 2001 to September 2004, and March 2012 to March 2016.