Stream buffers shall be required for all regulated activities adjacent to regulated streams. Any stream which is relocated or replaced because of stream alterations shall have at least the standard buffer width required for the class of stream involved, unless the alteration is a beneficial restoration project allowed under LMC 17.10.073. All stream buffers shall be measured from the ordinary high water mark as surveyed in the field. In braided channels and alluvial fans, the ordinary high water mark shall be determined so as to include the entire stream feature. Except as otherwise permitted under this chapter, stream buffers shall be retained in a natural, unaltered condition.

The following standard buffer widths shall be required, unless modified and approved in accordance with the provisions of this chapter: