Waters of the United States that are within the jurisdiction of the U.S. Army Corps of Engineers, Walla Walla District include traditional navigable waterways, all wetlands adjacent to traditional navigable waters, non-navigable waters that are relatively permanent and wetlands that directly abut such tributaries.
Tributaries that flow intermittently and receive water from natural streams and lakes and that divert water to streams and creeks are considered waters of the United States and are jurisdictional (Headwaters, Inc. v. Talent Irrigation District, 243 F.3d 526 (9th Cir. 2001)).
Non-relatively permanent waters are also waters of the United States, if they have a significant nexus to traditional navigable waters.
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