The Tolt River banks are eroding because of increased development and the loss of forestation, according to the agency's website.
Trees provide shade, erosion and flood control, and a home for the bugs that salmon snack on.
The tree-planting takes place from 9 a.m. to 1 p.m. Call 425-252-6686 to sign up and learn where to meet along the river.
Sign up at the Sound Salmon Solutions website, soundsalmon solutions.org, call 425-252-6686 or email stephanie@soundsalmon solutions.org.
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