The Willamette River at Portland site is located at the Morrison Bridge in downtown Portland, OR. Data are collected every half hour. Periods with no data are plotted are plotted as grey areas.

The chlorophyll fluorescence sensor provides an estimate of the amount of chlorophyll pigment found in algae based on a fluorescence response.

These data are provisional and are subject to revision.

Graph updated: Thursday - Nov 21, 2024 at 05:00:35 EST

graph of chlorophyll fluorescence

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U.S. Department of the Interior | U.S. Geological Survey
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Page Last Modified: Monday - Aug 26, 2024 at 18:19:00 EDT