Perennial Streams

BMP guidelines recommend that a minimum of a 50 foot SMZ be left on both sides of a perennial stream in order to filter sediment from overland flow, stabilize the stream bank, and to provide shade for stable water temperature. Other benefits of leaving an SMZ include but are not limited to: providing travel corridors and habitat for wildlife, adding aesthetic quality to a harvest area, and possibly reducing your property taxes.

Perennial streams flow at least 90% of the year under normal conditions.  If the flow of the stream can’t be determined, the presence of 5 or more of the following characteristics may help identify the stream as a perennial stream: