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DESCRIPTION:

Latitude 45°31'03",   Longitude 122°40'09"   NAD83

Multnomah County, Oregon, Hydrologic Unit 17090012

Drainage area: 11,200 square miles

Datum of gage: 1.55 feet above   NGVD29.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations     (availability statement)	1988-10-01	2017-07-24
Daily Data
Temperature, water, degrees Celsius	1975-11-07	2017-07-23	17552
Discharge, cubic feet per second	1972-10-01	2017-07-23	16367
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	1977-09-30	2017-07-23	16452
Dissolved oxygen, water, unfiltered, milligrams per liter	2009-01-22	2017-07-23	9202
pH, water, unfiltered, field, standard units	2009-01-22	2017-07-23	9134
Chlorophyll, total, water, fluorometric, 650-700 nanometers, in situ sensor, micrograms per liter	2009-01-22	2017-07-23	6162
Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)	2009-01-22	2017-07-23	9141
Discharge, tidally filtered, cubic feet per second	2006-09-30	2017-02-11	3788
Daily Statistics
Temperature, water, degrees Celsius	1978-02-09	2016-10-22	4857
Discharge, cubic feet per second	1972-10-01	2015-09-29	15704
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	1977-09-30	2016-10-22	5205
Dissolved oxygen, water, unfiltered, milligrams per liter	2009-01-22	2016-10-22	2791
Chlorophyll, total, water, fluorometric, 650-700 nanometers, in situ sensor, micrograms per liter	2009-01-22	2011-09-29	971
Discharge, tidally filtered, cubic feet per second	2006-09-30	2015-09-29	3287
Monthly Statistics
Temperature, water, degrees Celsius	1978-02	2016-10
Discharge, cubic feet per second	1972-10	2015-09
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	1977-09	2016-10
Dissolved oxygen, water, unfiltered, milligrams per liter	2009-01	2016-10
Chlorophyll, total, water, fluorometric, 650-700 nanometers, in situ sensor, micrograms per liter	2009-01	2011-09
Discharge, tidally filtered, cubic feet per second	2006-09	2015-09
Annual Statistics
Temperature, water, degrees Celsius	1978	2017
Discharge, cubic feet per second	1973	2015
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	1977	2017
Dissolved oxygen, water, unfiltered, milligrams per liter	2009	2017
Chlorophyll, total, water, fluorometric, 650-700 nanometers, in situ sensor, micrograms per liter	2009	2011
Discharge, tidally filtered, cubic feet per second	2006	2015
Peak streamflow	1894-06-07	2014-12-22	45
Field measurements	1987-11-20	2017-02-11	154
Field/Lab water-quality samples	1974-10-25	2017-07-11	704
Water-Year Summary	2006	2016	11
Additional Data Sources	Begin Date	End Date	Count
Instantaneous-Data Archive  **offsite**	1988-10-01	2007-05-06	174087

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