Most King County offices will be closed on Monday, May 30, 2016, for Memorial Day.  
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The Stream and River Monitoring Program is part of the King County Department of Natural Resources and Parks, Water and Land Resources Division. We are committed to monitoring the water quality of the County's lakes and streams to ensure their continued health, as well as the health of the public who utilize the many freshwater resources.

At this Web site you will be able to learn about the purpose and history of this program, what parameters are analyzed and how samples are collected. You will also be able to view a list or a map of the current sites that are monitored in the program, view information about individual streams and watersheds and view data graphs. Analyses such as long-term water quality trends, and the Water Quality Index are also available. You can also learn about special projects such as the Stream Sediment Monitoring Study.

Related King County stream and river Web sites include:

Other stream and river Web sites include:


If you have question on this site, please contact Debra Bouchard (206) 477-4650 or Curtis DeGasperi (206) 477-4677

Stream News

New Zealand Mud Snail Alert!.

High Bacteria in Creeks

We recommend avoiding contact with water from the following creeks due to high bacteria: John's Creek, Juanita Creek, Ravenna Creek, Idylwood Creek, and Thornton Creek! For more information visit the Swim Beach Monitoring Web Page.