USGS Water-Year Summary for Site USGS 11335000

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	Available Parameters
	00010 Temperature, water(Min.,Max.,Med.)
	00060 Discharge(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

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.

REVISIONS HISTORY - WSP 331: 1911-12. WSP 1315-A: 1908-9, 1911 (instantaneous maximum discharge). WSP 1930: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1907 to current year. Monthly discharge only for some periods, published in WSP 1315-A.

GAGE - Water-stage recorder. Datum of gage is 170.68 ft above NAVD of 1988. Prior to July 10, 1930, nonrecording gage at same site and datum.

REMARKS - Flow partly regulated since January 1955 by Jenkinson Lake, usable capacity, 40,570 acre-ft. Water is released from Jenkinson Lake through Camino Conduit for irrigation and domestic supply in North Fork Cosumnes and South Fork American River Basins. Numerous small diversions upstream from station for irrigation and domestic use. See schematic diagram of Sacramento-San Joaquin Delta available from the California Water Science Center.

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. Maximum measured discharge, 63,700 ft³/s, Dec. 31st, 2022, gage height, 16.45 ft.

WATER-QUALITY RECORDS

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.

REMARKS - Water-temperature records for 2014 water year rated excellent. Water-temperature records for 2015 water year rated good, except for some periods which are rated excellent to poor. Water-temperature records for 2016 water year are rated excellent, except for January 26 to March 3, which are rated good. Interruption in record due to periods of no flow.