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Coast guard and EPA have different definitions of navigable waters. Coast guard it's all bays and river that flows into the sound. I'm pretty sure it only applies to the Columbia,&snake but may include the rivers like the Yakima
Compounding the confusion, the bottom of streams is sometimes an issue. for example, on the East Fork, Lewis River and Kalama, some property owners claim the river bottom and will not allow anchoring. Their claim is that their survey shows ownership to the center of the river, or whatever. In the case of the Kalama, a sheriff once told me he didn't care, he would not enforce against anyone dropping anchor while fishing. On the East Fork, a landowner and fishing author Bill Stinson, asked me to pull my anchor since he "owned the bottom."The Coast Guard district office in Seattle publishes a list of navigable waters within the district.Regardless, locals sometimes try to exert pressure to prohibit access, even in cases where WDFW paid money for sport access - Greys River comes to mind.