|Levees and Flood Control - Operation Procedure and Practices for Levee Vegetation|
Trees and other woody vegetation planted on levees can cause a levee to breach. High wind events can blow trees over, taking out the root wad and creating a point of erosion with a high potential for a levee breach. Corps standards restricting the type of vegetation that can be planted on a levee are strictly adhered to where levee failure has a high potential for loss of life and/or severe damage to high value properties. The Corps’ Portland District summarized the requirements and policies for vegetation practices on the drainage districts’ levees in a letter dated September 19, 2000 to the MCDD. Excerpts from this letter are in PDF form please contact MCDD for more information.