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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
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USGS Water-Year Summary 2024
14211820 COLUMBIA SLOUGH AT PORTLAND, OR
LOCATION - Lat 45°38'21", long 122°45'43" referenced to North American Datum of 1927, in NE 1/4 SE 1/4 sec.23, T.2 N., R.1 W., Multnomah County, OR, Hydrologic Unit 17090012, on right bank, 0.6 mi upstream from mouth and 1.25 mi upstream from confluence of Willamette and Columbia Rivers.
DRAINAGE AREA - Indeterminate.
REVISIONS HISTORY - Discharges approved and reported via NWISWeb for period Oct. 1 to Nov. 1, 2014 have been revised.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1989 to current year.
GAGE - Water-stage recorder and acoustic velocity meter. Datum of gage is 1.53 ft above NGVD of 1929.
REMARKS - Flow significantly affected by astronomical tides. Daily mean discharges since water year 2007 are computed from filtered unit value discharge data. The Godin low-pass filter is used to remove tidal variations from unit values.
EXTREMES FOR PERIOD OF RECORD - Maximum daily discharge, 2,400 ft³/s Dec. 5, 1995, but may have been higher during periods of missing record Dec. 2-4, 1995, Feb. 10-14, 1996; maximum gage height, 27.26 ft Feb. 9, 1996, from floodmark; minimum daily discharge, -6,700 ft³/s Feb. 7, 1996, but may have been lower during periods of missing record Nov. 29 to Dec. 3, 1995, Feb. 8, 9, 1996.
