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USGS Water-Year Summary 2024
14211500 JOHNSON CREEK AT SYCAMORE, OR
LOCATION - Lat 45°28'38.84", long 122°30'28.87" referenced to North American Datum of 1983, in SW 1/4 sec.13, T.1 S., R.2 E., Multnomah County, OR, Hydrologic Unit 17090012, on left bank, 2.8 mi east of Interstate 205 in Portland and at mile 10.2.
DRAINAGE AREA - 26.8 mi².
REVISIONS HISTORY -
WSP 1318: 1941(M). WDR OR-75-1: 1974. WDR OR-77-1: Drainage area.
Revisions: Discharges approved and reported via NWISWeb for period Oct. 1 to Nov. 17, 2015 have been revised.
SURFACE-WATER RECORDS
PERIOD OF RECORD - July 1940 to current year.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 228.47 ft above NGVD of 1929.
REMARKS - Since January 1980, an occasional overflow from Powell Butte Reservoir enters Johnson Creek at Circle Avenue, mile 11.6. Slight diurnal fluctuation at low flow caused by recreational ponds upstream. Small diversions for irrigation upstream from station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 2,740 ft³/s Dec. 7, 2015, gage height, 15.28 ft; maximum gage height, 15.30 ft Nov. 19, 1996; minimum discharge, 0.08 ft³/s Aug. 21, 1966.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD - WATER TEMPERATURE: April 1998 to current year.
INSTRUMENTATION - Temperature probe and data logger.
REMARKS - Chemical analyses and periodic suspended sediment data have been collected at this location.
EXTREMES FOR PERIOD OF DAILY RECORD - WATER TEMPERATURE: Maximum, 29.4°C June 28, 2021; minimum, -0.2°C Feb. 5-9, 2014.
