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Water-Year Summary for Site 14210000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00045 Precipitation(Sum)  
00060 Discharge(Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00400 pH(Max.,Min.,Med.)  
63680 Turbidity, Form Neph(Med.,Max.,Min.)  

Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023
LOCATION - Lat 45°18'00", long 122°21'10" referenced to North American Datum of 1927, in NE 1/4 sec.19, T.3 S., R.4 E., Clackamas County, OR, Hydrologic Unit 17090011, on left bank, 0.2 mi downstream from River Mill Dam, 1.5 mi northwest of Estacada and at mile 23.1.
DRAINAGE AREA - 671 mi².
REVISIONS HISTORY - WSP 1248: 1908-9, 1910(M), 1916, 1917(M), 1922(M), 1923. WSP 1288: Drainage area (former site). WSP 1638: 1919(M).
PERIOD OF RECORD - April 1908 to current year. Monthly discharge only April 1908, published in WSP 1318. Published as "near Cazadero" January 1909 to September 1957.
GAGE - Water-stage recorder. Datum of gage is 286.93 ft above NGVD of 1929 (levels by Portland General Electric Co.). See WSP 1738 for history of changes prior to Oct. 1, 1957. Oct. 1, 1957 to Feb. 16, 1965, water-stage recorder at same site at datum 12 ft higher. Feb. 17, 1965 to Sept. 30, 1991, water-stage recorder at same site at datum 10 ft higher.
REMARKS - Diurnal fluctuation and some regulation caused by powerplants at River Mill Dam, and since 1958, North Fork Dam. Minor regulation since 1956 by Timothy Lake (active capacity, 64,450 acre-ft). Small diversion upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 86,900 ft³/s Dec. 22, 1964, gage height, 30.36 ft (present datum); minimum discharge, 50 ft³/s Mar. 10, 1961, from rating curve extended below 260 ft³/s; minimum daily, 285 ft³/s Oct. 4, 5, 1958, caused by filling of North Fork Dam forebay.
PERIOD OF RECORD - PRECIPITATION: October 2010 to November 2012, October 2014 to current year.
INSTRUMENTATION - Unshielded, standard 7.874-in diameter, tipping-bucket precipitation gage, mounted atop post with top of collector 5 ft above ground surface.
REMARKS - PRECIPITATION: Collection, computation, and publication of precipitation data do not necessarily conform to standards used by the National Weather Service. Records published in this report are for general scientific use.

SPECIFIC CONDUCTANCE: July 2001 to current year.

pH: July 2001 to current year.

WATER TEMPERATURE: July 2001 to current year.

DISSOLVED OXYGEN: July 2001 to current year.

TURBIDITY: July 2001 to current year.

INSTRUMENTATION - Water-quality monitor. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government.
REMARKS - TURBIDITY: Data collected using a YSI EXO2 sonde. Manufacturer's stated accuracy is the greater of +/- 2 percent of reading or 0.3 Formazin Nephelometric Units (FNU) for 0-999 FNU, and +/- 5 percent for 1,000-4,000 FNU. Prior to Oct. 13, 2016, data collected using a YSI 6136 turbidity sensor. Manufacturer's stated accuracy is the greater of +/- 2 percent or 0.3 Formazin Nephelometric Units. FNU values below 10 are reported to nearest 0.1 FNU. Prior to Oct. 7, 2014, data was collected using a YSI 6026 turbidity sensor. Manufacturer's stated accuracy is the greater of +/- 5 percent or 2 FNU. FNU values below 10 are reported to nearest 0.1 FNU. Negative recorded values are reported as 0.0 FNU. Additional parameters collected at this location not referenced in this document are available via NWISWeb.

SPECIFIC CONDUCTANCE: Maximum, 80 microsiemens Sept. 2, 2013; minimum, 24 microsiemens Apr. 14, 15, 2002.

pH: Maximum, 8.5 units Feb. 20, 2018; minimum, 6.4 units Dec. 23, 2005.

WATER TEMPERATURE: Maximum, 20.7°C July 9, 10, 2015; minimum, 0.3°C Dec. 11, 2013.

DISSOLVED OXYGEN: Maximum, 15.9 mg/L Dec. 3, 2007; minimum, 7.9 mg/L July 7, 9, 2015.

TURBIDITY: Maximum, 278 FNU Jan. 16, 2011; minimum, <1 FNU on many days each year.