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Water Quality Samples for Oregon

! Discrete water samples data are undergoing modernization with this page no longer being updated with the latest data starting March 11, 2024
with a full decommission expected 6 months later. Learn more about the upcoming change and where to find the new samples data in our blog.

USGS 14211720 WILLAMETTE RIVER AT PORTLAND, OR

Multnomah County, Oregon
Hydrologic Unit Code 17090012
Latitude  45°31'03", Longitude 122°40'09" NAD83
Drainage area 11,200  square miles
Gage datum 1.55 feet above NGVD29
Output formats
Parameter Group Period of Record table
Inventory of available water-quality data for printing
Inventory of water-quality data with retrieval
Tab-separated data, one result per row
Tab-separated data one sample per row with remark codes combined with values
Tab-separated data one sample per row with tab-delimiter for remark codes
Reselect output format
Parameter Group Summary of Available Data
Parameter Group First
Date		 Last
Date		 Number of
Samples		 Number of
Values
All -- include all parameter groups 1974-10-25 2024-02-12 941 111523
Information 1974-10-25 2024-02-12 873 11758
Physical 1974-10-25 2024-02-12 754 12038
Inorganics, Major, Metals 1974-10-25 2023-12-04 468 2783
Inorganics, Major, Non-metals 1974-10-25 2024-02-12 746 7615
Nutrient 1974-10-25 2023-12-18 639 9672
Microbiological 1974-10-25 2019-10-08 187 461
Biological 1974-10-25 2021-11-17 211 357
Inorganics, Minor, Metals 1974-10-25 2023-12-04 393 5660
Inorganics, Minor, Non-metals 1974-10-25 2023-12-04 369 1315
Organics, pesticide 1983-07-01 2023-12-18 484 55598
Organics, PCBs 1992-09-09 1997-08-28 11 11
Organics, other 1974-10-25 2023-12-18 428 1298
Radiochemical 1974-12-31 2005-04-14 117 539
Sediment 1974-10-25 2023-09-05 628 1585
Population/Community 1974-10-25 1981-09-23 57 833